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University of Hawaii – Manoa
1.
Chen, Zhitong.
Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061.
Degree: 2015, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/100536 
► M.S. University of Hawaii at Manoa 2014.
The objective of this research was to study microstructure characterization, mechanical properties, and corrosion behavior of friction stir…
(more)
▼ M.S. University of Hawaii at Manoa 2014.
The objective of this research was to study microstructure characterization, mechanical properties, and corrosion behavior of friction stir welding AA5086 and AA6061. The microstructure of six distinct zones (NZ, TMAZ, HAZ, BM, downside, and cross-section) of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061 were investigated using etching technology and optical microscope. The hardness of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061 was measured by Wilson Rockwell Vickers Micro-hardness Tester to study how distinct regions affect mechanical properties. Tensile tests were conducted to study tensile and yield strength of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061. The results indicate that the fracture occurred in the relatively weaker TMAZ/HAZ.
In this study, two major corrosion evaluation methods were used: the polarization test and the immersion test. Polarization experiments of critical regions of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061 were conducted in deaerated 3.15 wt% NaCl to study the governing corrosion mechanisms. Cathodic polarization of critical zones of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061 were conducted in aerated 3.15 wt% NaCl and 0.5 M Na2SO4 solutions. These results show that friction stir welding improves the corrosion resistance of AA5086 and AA6061 and that the HAZ and downside regions have better corrosion resistance than other regions. The immersion experiments were conducted to study corrosion properties of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061. Specimens of friction stir welding AA5086-AA5086, AA5086-AA6061, and AA6061-AA6061 were soaked in 3.15 wt% NaCl, 0.5 M Na2SO4 and American Society for Testing and Materials (ASTM) seawater for 90 days and 120 days at 30°C. The X-Ray Diffraction (XRD) and Raman spectroscopy were used to characterize the immersion samples and revealed that aluminum hydroxide was the main corrosion product. Intergranular attack was observed in the NZ and downside by scanning electron microscopy (SEM).
Subjects/Keywords: Aluminum Alloy
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APA (6th Edition):
Chen, Z. (2015). Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/100536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Zhitong. “Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061.” 2015. Thesis, University of Hawaii – Manoa. Accessed April 11, 2021.
http://hdl.handle.net/10125/100536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Zhitong. “Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061.” 2015. Web. 11 Apr 2021.
Vancouver:
Chen Z. Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061. [Internet] [Thesis]. University of Hawaii – Manoa; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10125/100536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen Z. Microstructure characterization, mechanical properties, and corrosion behaviors of friction stir welded AA5086 and AA6061. [Thesis]. University of Hawaii – Manoa; 2015. Available from: http://hdl.handle.net/10125/100536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brunel University
2.
Yan, Feng.
Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process.
Degree: PhD, 2014, Brunel University
URL: http://bura.brunel.ac.uk/handle/2438/13883
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702098
► Aluminium alloys are the most promising lightweight materials used in the automotive industry to achieve weight reduction for improving fuel efficiency and reducing CO2 emissions.…
(more)
▼ Aluminium alloys are the most promising lightweight materials used in the automotive industry to achieve weight reduction for improving fuel efficiency and reducing CO2 emissions. High pressure diecasting (HPDC) is a fast and economical near-net shape manufacturing method to produce engineering components. About 80% of cast aluminium alloys are currently manufactured by HPDC. The increased demands of manufacturing structural components by HPDC process require high strength Al-alloys for the automotive industry. However, the currently available die cast Al-alloys are unable to fulfil this requirement. Al-Mg2Si alloy is known as an alloy capable of providing superior high strength by Mg2Si particles. However, Al-Mg2Si alloy is not applicable in the HPDC process because of the severe die soldering problem. This has limited its applications throughout industries. Moreover, the existing studies on the Al-Mg2Si alloy are mainly focused on the hyper-eutectic alloys and limited information is available for hypo-eutectic alloys. Generally, the mechanical properties of Al-alloys are determined by the alloy composition, the defect levels in the components, the microstructure which is mainly controlled by the casting process and heat treatment process. Due to the high cooling rate provided by the die block in the HPDC process, the refined microstructure in the die cast Al-Mg2Si alloys can be obtained to improve the mechanical properties. Therefore, the development of high strength Al-Mg2Si based alloys for the HPDC process is significant for manufacturing quality automotive components. The present study mainly focuses on the alloy development for the HPDC process. In order to make die castable Al-Mg2Si based alloys, the effect of excess Mg has been investigated to modify the hypo-eutectic Al-Mg2Si system for improving the mechanical properties. The effect of excess Mg on the solidification and microstructural evolution, and the mechanical properties of Al-Mg2Si alloys, has also been investigated by the combination of thermodynamic calculation and the experimental validation. The excess Mg in the hypo-eutectic Al-Mg2Si alloys has been found to be able to shift the eutectic composition to a lower Mg2Si content, which means that the hypo-eutectic composition of Al-Mg2Si alloy can be at eutectic or hyper-eutectic compositions after adding different levels of excess Mg. The experimental trials have also found that Al-8Mg2Si-6Mg alloy provides the best combination of strength and ductility in the as-cast castings made by the HPDC process. This can be further enhanced by adding 0.6wt.% Mn, which exhibits yield strength of 189MPa, UTS of 350MPa, and elongation of 6.5%. Investigations have also revealed that the Al-8Mg2Si-6Mg alloy exhibits a relatively high tolerance to the Fe impurity because of the insignificant reduction of ductility of the alloy. The elongation is still at a level of 5% when Fe is at 1.6wt.% in the alloy. Furthermore, Cu and Zn can further enhance the mechanical properties of the Al-8Mg2Si-6Mg-0.6Mn alloy. Cu…
Subjects/Keywords: 620.1; Aluminium alloy
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APA (6th Edition):
Yan, F. (2014). Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/13883 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702098
Chicago Manual of Style (16th Edition):
Yan, Feng. “Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process.” 2014. Doctoral Dissertation, Brunel University. Accessed April 11, 2021.
http://bura.brunel.ac.uk/handle/2438/13883 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702098.
MLA Handbook (7th Edition):
Yan, Feng. “Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process.” 2014. Web. 11 Apr 2021.
Vancouver:
Yan F. Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process. [Internet] [Doctoral dissertation]. Brunel University; 2014. [cited 2021 Apr 11].
Available from: http://bura.brunel.ac.uk/handle/2438/13883 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702098.
Council of Science Editors:
Yan F. Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process. [Doctoral Dissertation]. Brunel University; 2014. Available from: http://bura.brunel.ac.uk/handle/2438/13883 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702098
University of Manchester
3.
Luo, Chen.
Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:127468
► A heterogeneous microstructure is intentionally developed in AA2024-T3 aluminium alloy during solidification and thermomechanical processes to obtain good mechanical properties. As a consequence, the alloy…
(more)
▼ A heterogeneous microstructure is intentionally
developed in AA2024-T3 aluminium
alloy during solidification and
thermomechanical processes to obtain good mechanical properties. As
a consequence, the
alloy is susceptible to localized corrosion,
which is the major nucleus for onset of stress corrosion cracking
and fatigue cracking.In this research, electron microscopy was
employed to observe intermetallic particles and their periphery and
monitor the initiation and development of intermetallic particle
induced localized corrosion in AA2024-T3 aluminium
alloy. In-situ
optical microscopy, energy dispersive X-ray spectroscopy (EDX),
X-ray microtomography and atomic force microscopy were also used to
provide supportive evidence.Intermetallic particles with different
electrochemical natures and geometries were found. The main coarse
intermetallic particles are identified as S (Al2CuMg), θ (Al2Cu)
and α (Al-Cu-Fe-Mn-(Si)) phases. θ (Al2Cu) and α (Al-Cu-Fe-Mn-(Si))
phases showed a relatively inert nature compared with S-phase
particles. It was observed that continuous localized corrosion is
associated with large clusters of S-phase and θ-phase intermetallic
particles that are buried beneath surface but connected to the
alloy surface. Propagating away from the intermetallic particles,
corrosion developed preferentially along selected grain
boundaries.Electron backscatter diffraction (EBSD) was employed to
further investigate the relationship between the grain structure
and the intergranular corrosion susceptibility. It was revealed
that intergranular attack occurred at the grain boundaries that
surround grains of relatively high stored energy. Corrosion was not
confined within the region immediately adjacent to the grain
boundaries, but had developed into the grains of relatively high
stored energy, suggesting that grains with relatively high levels
of defects are more susceptible to corrosion.
Advisors/Committee Members: Zhou, Xiaorong.
Subjects/Keywords: Aluminium alloy; Corrosion; Intermetallic particles
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APA (6th Edition):
Luo, C. (2011). Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:127468
Chicago Manual of Style (16th Edition):
Luo, Chen. “Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy.” 2011. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:127468.
MLA Handbook (7th Edition):
Luo, Chen. “Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy.” 2011. Web. 11 Apr 2021.
Vancouver:
Luo C. Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:127468.
Council of Science Editors:
Luo C. Role of Microstructure on Corrosion Control of AA2024-T3
Aluminium Alloy. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:127468
4.
Jordan, Aaron.
Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011.
Degree: 2017, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:307827
► The influence of recycling on aluminium alloys and subsequent influence on the microstructure and corrosion performances have been investigated. The investigation was commenced by taking…
(more)
▼ The influence of recycling on aluminium alloys and
subsequent influence on the microstructure and corrosion
performances have been investigated. The investigation was
commenced by taking two block cast, recycled aluminium alloys
(AA5050 and AA6011) and rolling them into 1mm gauge plate. In the
case of AA6011, the plate was subjected to subsequent solution heat
treatment and artificial aging steps, in order to attain certain
temper specifications. To replicate the automotive paint bake
industrial practice, a sample was subjected to a 2% tensile stretch
followed by heat treatment for 30 minutes at 180˚C. Microstructural
observations revealed Al-Fe-Mn-Si intermetallics to be the dominant
secondary phase in both alloys. The size, distribution and
composition of these were unaffected by artificial aging. Mg2Si was
found in a coarse, localised form in both alloys also, albeit in
much less amounts in AA5050. The presence of this phase was likely
due to poor homogenisation during thermomechanical processing.
HR-TEM of AA6011 revealed needle/rod shaped precipitates, aligning
in the [001]Al lattice direction. This is consistent with β’’/β’
hardening precipitates consisting of magnesium and silicon.
Circumstantial evidence was found for the copper-containing Q phase
precipitate also. An additional, unidentified precipitate was
observed, nucleating on the {111} habit plane of the aluminium
matrix. The high iron content of AA6011 retarded the precipitation
hardening response by capturing elements associated with hardening
precipitates in the Al-Fe-Mn-Si intermetallics. Electrochemical
corrosion experiments revealed the materials had a high
susceptibility to localised corrosions, with the open circuit
potential and breakdown potential possessing similar values.
Atmospheric corrosion experiments showed that artificial aging had
a large influence on the preferred corrosion mechanism. Non-heat
treated samples showed susceptibility for pitting corrosion. This
was particularly true for the –T4P temper, which showed large scale
pitting. Heat treated samples saw an introduced susceptibility to
intergranular corrosion. This was attributed to precipitation at
grain boundaries, which would then form a microgalvanic couple with
adjacent depleted zones. In the case of the –T8P temper, tensile
stretching introduced defects into the sub-grain microstructure.
This resulted in intergranular corrosion fronts of increased width,
where grains with higher stored energy undergo preferential
dissolution alongside the grain boundary attack. Overall, the
detrimental effects of high iron content need to be overcome before
AA5050 and AA6011 can be seriously considered for use in the
automotive industry. However, the corrosion performance of
AA6011–T8P is encouraging.
Advisors/Committee Members: ZHOU, XIAORONG X, Thompson, George, Zhou, Xiaorong.
Subjects/Keywords: Aluminium Alloy; Recycling; Automotive Industry
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Jordan, A. (2017). Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:307827
Chicago Manual of Style (16th Edition):
Jordan, Aaron. “Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:307827.
MLA Handbook (7th Edition):
Jordan, Aaron. “Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011.” 2017. Web. 11 Apr 2021.
Vancouver:
Jordan A. Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:307827.
Council of Science Editors:
Jordan A. Microstructure Characterization and Corrosion Properties
of Two Recycled Aluminium Alloys AA5050 and AA6011. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:307827
University of Manchester
5.
Wei, Wu.
Study of Sensitization in AA5083 Aluminium
Alloy.
Degree: 2017, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308817
► An AA5083 aluminium alloy sensitized in service after 40 years exposure to ground atmosphere temperature is studied. Nitric acid mass loss test (NAMLT) is used…
(more)
▼ An AA5083 aluminium
alloy sensitized in service
after 40 years exposure to ground atmosphere temperature is
studied. Nitric acid mass loss test (NAMLT) is used to determine
the susceptibility to intergranular corrosion (IGC). The degree of
sensitization in various areas through the
alloy thickness was
found different, which can be associated with non-homogeneous Mg
distribution through the
alloy plate thickness. Structure
characterisation confirmed that the in-service sensitization is
associated with the formation of the ' phase and a cubic Al-Mg
transition phase with magnesium content between the GP zones and
the '' phase at the grain boundaries. In order to simulate the
in-service sensitization process and to gain insight into the
sensitization mechanism, the sensitization of AA5083
alloy at
relatively low temperatures, namely 70 and 100°C, is studied. For
the AA5083
alloy sensitized at 70°C, although the mass loss value
is below 15 mg/cm2, ' phase is observed as individual precipitates
at grain boundaries. The AA5083
alloy after exposure to 100°C for
240 hours is susceptible to IGC since the ' precipitates have
grown continuously at the grain boundaries. Additionally, the
effect of sensitization in AA5083
alloy on stress corrosion
cracking (SCC) is also investigated using constant displacement
double cantilever beam (DCB) testing. It is found that the cracking
length increases with the degree of sensitization. The population
density of the crack branches also increases with the degree of
sensitization. The metal between different small branches is known
as ligament. And with high degree of sensitization, the ligaments
between crack branches have become brittle. Therefore, small
branches became connected to form a continuous crack with the crack
propagating.
Advisors/Committee Members: THOMPSON, GEORGE GE, Thompson, George, Zhou, Xiaorong.
Subjects/Keywords: sensitization; AA5083 aluminium alloy
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APA ·
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Export
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Manager
APA (6th Edition):
Wei, W. (2017). Study of Sensitization in AA5083 Aluminium
Alloy. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308817
Chicago Manual of Style (16th Edition):
Wei, Wu. “Study of Sensitization in AA5083 Aluminium
Alloy.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308817.
MLA Handbook (7th Edition):
Wei, Wu. “Study of Sensitization in AA5083 Aluminium
Alloy.” 2017. Web. 11 Apr 2021.
Vancouver:
Wei W. Study of Sensitization in AA5083 Aluminium
Alloy. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308817.
Council of Science Editors:
Wei W. Study of Sensitization in AA5083 Aluminium
Alloy. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308817
University of Illinois – Chicago
6.
Lin, Shujun.
Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal.
Degree: 2018, University of Illinois – Chicago
URL: http://hdl.handle.net/10027/22710
► Strong and reliable joints is a major challenge that exists in various fields of structural engineering. Over the last decade, composite materials are more frequently…
(more)
▼ Strong and reliable joints is a major challenge that exists in various fields of structural engineering. Over the last decade, composite materials are more frequently used in aerospace industry, although concerns remaining on difficulty in in-service damage investigation and repair. Various damage due to heat, moisture ingress and wrinkles happening in composites can be difficult to quantify.
This study fabricates
aluminum alloy 7075 with zinc filler metal, which is primary
alloy element of
aluminum alloy 7075, using transient liquid phase (TLP) bonding. Zinc foil and nanopowder as filler metal were compared after evaluation of joint site. Various bonding parameters were tested in order to achieve strong and reliable joints. Achieving this goal would benefit industries that require structural reliability. The relationship between composition in diffusion affecting zone and microstructure is then discussed based on background studies.
Advisors/Committee Members: Indacochea, Ernesto J (advisor), Ozevin, Didem (committee member), McNallan, Michael J (committee member), Indacochea, Ernesto J (chair).
Subjects/Keywords: TLP bonding; aluminum alloy
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APA ·
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APA (6th Edition):
Lin, S. (2018). Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/22710
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Shujun. “Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal.” 2018. Thesis, University of Illinois – Chicago. Accessed April 11, 2021.
http://hdl.handle.net/10027/22710.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Shujun. “Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal.” 2018. Web. 11 Apr 2021.
Vancouver:
Lin S. Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal. [Internet] [Thesis]. University of Illinois – Chicago; 2018. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10027/22710.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin S. Metallurgical Studies of Transient Liquid Phase Bonding of 7075 Aluminum Alloy with Zinc Filler Metal. [Thesis]. University of Illinois – Chicago; 2018. Available from: http://hdl.handle.net/10027/22710
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Windsor
7.
Fang, Li.
Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition.
Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2018, University of Windsor
URL: https://scholar.uwindsor.ca/etd/7474
► With the advent of downsized engines, castable high strength aluminum alloys for lightweight engine components are urgently needed for the replacement of cast iron. The…
(more)
▼ With the advent of downsized engines, castable high strength
aluminum alloys for lightweight engine components are urgently needed for the replacement of cast iron. The aim of this study is to develop new casting
aluminum alloys and processing technologies for the production of lightweight powertrain components with as cast high strengths. The first stage of this study was to develop an appropriate casting method which was advantageous to increase the mechanical properties of
aluminum alloy A380. Squeeze casting was found to be effective for the elimination of porosity in
aluminum alloy A380 with a relatively thick cross section compared with the conventional high pressure die casting process. Mechanical properties such as ultimate tensile strength (UTS) and elongation to failure (Ef) was enhanced up to 215.9 MPa and 5.4% respectively over those of the conventional high-pressure die cast part (UTS: 173.7 MPa, Ef::1.0%). The analysis of tensile behavior showed that the squeeze cast A380 exhibited a high tensil toughness (8.5 MJ·m3) and resilience (179.3 kJ·m3) compared with the die cast
alloy (toughness: 1.4 MJ·m3, resilience: 140.6 kJ·m3). To meet the requirement of high temperature environment for automotive application components, transition alloying element nickel (Ni) was added into the
aluminum alloy A380. The results of tensile testing on the Ni-containing A380 alloys showed that Ni was an effective additive for improving mechanical properties. As the Ni addition increased from 0 to 2.0 wt.%, the ultimate tensile and yield strengths and resilience rise to 225.40 MPa, 128.04 MPa and 175.90 kJ/m3 respectively. Examination of the analyzed microstructures indicates that the complex Ni-containing intermetallic phases forms once Ni added. The influence of transition alloying element nickel addition to the solidification of squeeze cast
aluminum alloy A380 was also investigated via thermal analysis. 2%Ni addition to A380 promoted the formation of the Ni-containing ternary phase at a relatively high temperature and suppressed the formation of the Al-Cu phase which took place at a relatively low temperature during solidification. One less phase formation was observed in cooling process. With alkaline earth element, strontium added into A380 as a modifier of eutectic silicon, the strength of
alloy was further improved up to UTS: 241.6MPa and YS: 172.5MPa. A design of experiment (DOE) technique, the Taguchi method, was used to develop as-cast high strength
aluminum alloys with various element additions of Si, Cu, Ni and Sr. For each element, three different levels of weight percentages were selected (Si: 6, 9, 12%, Cu: 3, 5, 7%, Ni: 0.5, 1, 1.5% and Sr: 0.01, 0.02, 0.03%). Tensile properties as ultimate tensile strength, yield strength and elongation at failure were selected as three individual responses to evaluate the engineering performance of the designed alloys. The
alloy with the optimal composition had average UTS of 267.00 MPa, elongation at failure of 1.13% and yield strength of 210.37 MPa under the as-cast…
Advisors/Committee Members: Hu, Hongfa.
Subjects/Keywords: A380; Aluminum Alloy; Nickel; Strontium
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Manager
APA (6th Edition):
Fang, L. (2018). Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7474
Chicago Manual of Style (16th Edition):
Fang, Li. “Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition.” 2018. Doctoral Dissertation, University of Windsor. Accessed April 11, 2021.
https://scholar.uwindsor.ca/etd/7474.
MLA Handbook (7th Edition):
Fang, Li. “Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition.” 2018. Web. 11 Apr 2021.
Vancouver:
Fang L. Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition. [Internet] [Doctoral dissertation]. University of Windsor; 2018. [cited 2021 Apr 11].
Available from: https://scholar.uwindsor.ca/etd/7474.
Council of Science Editors:
Fang L. Development of As-Cast High Strength Aluminum Alloys with Ni and Sr addition. [Doctoral Dissertation]. University of Windsor; 2018. Available from: https://scholar.uwindsor.ca/etd/7474
Oregon State University
8.
Wei, Youran.
Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors.
Degree: MS, Materials Science, 2015, Oregon State University
URL: http://hdl.handle.net/1957/58005
► Oxide growth is a common phenomenon on aluminum alloy cladding surfaces in nuclear research and test reactors. Without better understanding of oxide growth, excessive oxide…
(more)
▼ Oxide growth is a common phenomenon on
aluminum alloy cladding surfaces in nuclear
research and test reactors. Without better understanding of oxide growth, excessive oxide
build up on the cladding surface reduces heat transfer capability from fuel to coolant and
causes safety concerns due to the potential cladding rupture or fuel melt. The purpose of
this research is to further the understanding of the oxide growth under the operational
conditions in nuclear research and test reactors. The four main objectives of this project
are to:
1. Extend the existing database for corrosion of
aluminum alloy 6061
2. Evaluate the existing correlations for
aluminum alloy corrosion under new
experimental conditions
3. Help increase the research reactors' operation safety confidence
4. Evaluate the necessity of the pre-filmed boehmite ( AlO(OH) ) layer.
The objectives were accomplished by exposing
aluminum alloy 6061 coupons in a test
loop operating at low pressure and low temperature. Data from the test loop such as
temperature, pressure, pH and exposure time were recorded. SEM (Scanning electron
microscope) and ImageJ analysis were used for post experiment examinations to obtain
oxide thickness measurement data. Matlab was used to conduct oxide thickness
prediction by using existing correlations. Oxide thickness predictions and measurements
were compared. EDS (Energy Dispersive Spectroscopy) and XRD (X-Ray Diffraction)
analysis were used to identify the oxide chemistry and stoichiometry.
Advisors/Committee Members: Tucker, Julie (advisor), Isgor, Burkan (committee member).
Subjects/Keywords: Aluminum alloy 6061; Aluminum alloys – Oxidation
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MLA ·
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APA (6th Edition):
Wei, Y. (2015). Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/58005
Chicago Manual of Style (16th Edition):
Wei, Youran. “Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors.” 2015. Masters Thesis, Oregon State University. Accessed April 11, 2021.
http://hdl.handle.net/1957/58005.
MLA Handbook (7th Edition):
Wei, Youran. “Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors.” 2015. Web. 11 Apr 2021.
Vancouver:
Wei Y. Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1957/58005.
Council of Science Editors:
Wei Y. Characterization of Oxide Growth of Aluminum Alloy 6061 for Nuclear Research and Test Reactors. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/58005
Queen Mary, University of London
9.
Fahad, Noor.
Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials.
Degree: PhD, 2014, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8777
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667283
► Aluminum based reactive nanomaterials have extensive applications in many fields including solid propellants, pyrotechnics, and catalytic reactions. One recent example is the novel concept of…
(more)
▼ Aluminum based reactive nanomaterials have extensive applications in many fields including solid propellants, pyrotechnics, and catalytic reactions. One recent example is the novel concept of using nanostructured energetic particles for energy storage where the controlled exothermic reaction is the key to control the energy release process. It is of primary interest to understand the thermodynamics, kinetics, morphological and structural properties of these particles during the exothermic reaction. While the physiochemical properties of the monometallic powders are determined only by their size, the properties of bimetallic nanoalloys can be also engineered by their constituent compositions. This thesis conducts a systematic experimental investigation of the oxidation, ignition, and combustion of nano aluminum particles (nAl) and nanoalloys such as nanoscale aluminium-copper (n-AlCu) and aluminium-zinc (n-AlZn). The oxidation experiments are conducted by a TGA/DSC system with detailed characterisation of particles before and after the experiments by scanning electron microscopy (SEM), transmission electron microscopy (TEM), the Nanosizer, Brunauer–Emmett–Teller (BET), energy dispersive X-ray spectroscopy (EDS) and powder X-ray diffractionmetry (XRD). In the TGA/DSC analysis, nanomaterials are oxidized either at constant temperature or under different heating rates in the controlled atmosphere of air or nitrogen. A unique early ignition reaction is observed at the high heating rates for nAl and n-AlCu, which is associated with the effect of polymorphic phase transformation of the alumina shell and the early melting of the aluminum core. Different to the conventional shrink-core concept, hollow structures, i.e. nanoholes, in the central regions of nAl are observed and a phenomenal model is proposed. The comparison of the thermal-chemical characteristics of different nanomaterials reveals some unique 5 features related to nano-alloys such as increased reactivity. A preliminary combustion experiment on feeding nanoparticles in a methane stream is performed with a Bunsen burner setup, where the burning characteristics of different nanoparticles are analysed.
Subjects/Keywords: 620.1; Oxidation; Ignition; Combustion; energetic nanoparticles,; nanofuel; nanoalloys; Aluminium; aluminum copper alloy; zinc aluminum alloy; silicon
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APA (6th Edition):
Fahad, N. (2014). Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8777 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667283
Chicago Manual of Style (16th Edition):
Fahad, Noor. “Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed April 11, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8777 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667283.
MLA Handbook (7th Edition):
Fahad, Noor. “Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials.” 2014. Web. 11 Apr 2021.
Vancouver:
Fahad N. Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2021 Apr 11].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8777 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667283.
Council of Science Editors:
Fahad N. Experimental study of oxidation, ignition and combustion of aluminum based nanomaterials. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8777 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667283
University of Manchester
10.
Ma, Yanlong.
Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:118214
► The effect of microstructure on corrosion resistance and anodising behaviour of a 3rd generation lithium-containing aluminium alloy, AA 2099-T8, has been studied.Microstructural characterisation of the…
(more)
▼ The effect of microstructure on corrosion
resistance and anodising behaviour of a 3rd generation
lithium-containing aluminium
alloy, AA 2099-T8, has been
studied.Microstructural characterisation of the
alloy has shown
elongated grains with high angle grain boundaries and approximately
equiaxed subgrains with low angle grain boundaries. Two types of
constituent particles of high and reduced contents of copper were
found, which are present individually or in the form of multiphase
particles. The
alloy also contains rod-like Al-Cu-Mn-Li and
spherical (Al3Zr) dispersoids, and fine age hardening precipitates
of T1 (Al2CuLi), (Al3Li) and (Al2Cu).Immersion testing in a
chloride-containing solution revealed two types of localised
corrosion sites: one was initiated from intermetallics and quickly
became passivated; the other lasted for the course of testing, with
extensive boundary attack. The latter has been correlated to grains
and subgrains with relatively high stored energy.Alkaline etching
removed intermetallics from
alloy surface; generated a
copper-enriched layer in the
alloy matrix immediately beneath the
residual alumina film; and gradually developed a surface
nanotexture. The surface nanotexture has been correlated to the
formation of copper-rich nanoparticles within the copper-enriched
layer.Anodising the
alloy in tartaric-sulphuric acid disclosed that
copper in the
alloy matrix could be occluded in the anodic film
material as copper-rich nanoparticles or be oxidized and
incorporated into the film material as copper ions, depending on
the anodising voltage. In the latter case, the process was
accompanied by oxygen gas generation within the film material,
forming anodic films with lateral porosity. Intermetallics of
different compositions behaved differently during anodising,
leading to modification of the morphology and composition of anodic
films. Concerning the effect of alkaline etching on anodising
behaviour of the
alloy, the removal of intermetallics increased
anodising efficiency; the pre-developed copper-enriched layer
advanced the establishment of the steady-state film/
alloy
interface. Variation of copper-enriched layer structure is revealed
by the detection of copper-rich nanoparticles in the
copper-enriched layer. The copper-rich nanoparticles have
structures consistent with either θ′′, θ′ or θ phases. Machining
damage can be detected not only by chromic acid anodising (CAA) but
also by tartaric-sulphuric acid anodising (TSAA). Neither CAA nor
TSAA can be used for detecting shallow corrosion
pits.
Advisors/Committee Members: Zhou, Xiaorong.
Subjects/Keywords: AA 2099 aluminium alloy; Corrosion; Anodising
Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ma, Y. (2011). Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:118214
Chicago Manual of Style (16th Edition):
Ma, Yanlong. “Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy.” 2011. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:118214.
MLA Handbook (7th Edition):
Ma, Yanlong. “Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy.” 2011. Web. 11 Apr 2021.
Vancouver:
Ma Y. Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:118214.
Council of Science Editors:
Ma Y. Effect of microstructure on corrosion resistance and
anodising behaviour of AA 2099-T8 aluminium alloy. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:118214
Anna University
11.
Giriraj, B.
Studies on high speed milling of aluminium
alloy; -.
Degree: Mechanical Engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/27009
► High Speed Milling HSM is a processing technology that finds newlinenumerous applications in manufacturing industry It is a manufacturing newlinetechnology to many industries where machining…
(more)
▼ High Speed Milling HSM is a processing technology
that finds newlinenumerous applications in manufacturing industry
It is a manufacturing newlinetechnology to many industries where
machining time is a significant fraction newlineof the total
product manufacturing cycle time The other benefits of HSM are
newlinereduced cost better surface finish low residual stress and
less work piece newlinedistortion A better understanding and
control of the machining process is newlinenecessary to satisfy the
increasing demand higher productivity and product newlinequality
Process monitoring and its control will help in development of
newlineautomated control of process and thereby improve
productivity and product newlinequality Milling and in particular
highspeed milling owing to the high newlinecomplexity only limited
understanding of the process has been achieved till newlinetoday
newline newline
Reference p.135-140
Advisors/Committee Members: Gandhinathan, R.
Subjects/Keywords: aluminium alloy; high speed milling; mechanical engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Giriraj, B. (2014). Studies on high speed milling of aluminium
alloy; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27009
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Giriraj, B. “Studies on high speed milling of aluminium
alloy; -.” 2014. Thesis, Anna University. Accessed April 11, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/27009.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Giriraj, B. “Studies on high speed milling of aluminium
alloy; -.” 2014. Web. 11 Apr 2021.
Vancouver:
Giriraj B. Studies on high speed milling of aluminium
alloy; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Apr 11].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27009.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Giriraj B. Studies on high speed milling of aluminium
alloy; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27009
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
12.
Luo, Chen.
Role of microstructure on corrosion control of AA2024-T3 aluminium alloy.
Degree: PhD, 2011, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/role-of-microstructure-on-corrosion-control-of-aa2024t3-aluminium-alloy(6954f1a8-920e-4242-bfb4-437be7d27127).html
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542783
► A heterogeneous microstructure is intentionally developed in AA2024-T3 aluminium alloy during solidification and thermomechanical processes to obtain good mechanical properties. As a consequence, the alloy…
(more)
▼ A heterogeneous microstructure is intentionally developed in AA2024-T3 aluminium alloy during solidification and thermomechanical processes to obtain good mechanical properties. As a consequence, the alloy is susceptible to localized corrosion, which is the major nucleus for onset of stress corrosion cracking and fatigue cracking.In this research, electron microscopy was employed to observe intermetallic particles and their periphery and monitor the initiation and development of intermetallic particle induced localized corrosion in AA2024-T3 aluminium alloy. In-situ optical microscopy, energy dispersive X-ray spectroscopy (EDX), X-ray microtomography and atomic force microscopy were also used to provide supportive evidence.Intermetallic particles with different electrochemical natures and geometries were found. The main coarse intermetallic particles are identified as S (Al2CuMg), θ (Al2Cu) and α (Al-Cu-Fe-Mn-(Si)) phases. θ (Al2Cu) and α (Al-Cu-Fe-Mn-(Si)) phases showed a relatively inert nature compared with S-phase particles. It was observed that continuous localized corrosion is associated with large clusters of S-phase and θ-phase intermetallic particles that are buried beneath surface but connected to the alloy surface. Propagating away from the intermetallic particles, corrosion developed preferentially along selected grain boundaries.Electron backscatter diffraction (EBSD) was employed to further investigate the relationship between the grain structure and the intergranular corrosion susceptibility. It was revealed that intergranular attack occurred at the grain boundaries that surround grains of relatively high stored energy. Corrosion was not confined within the region immediately adjacent to the grain boundaries, but had developed into the grains of relatively high stored energy, suggesting that grains with relatively high levels of defects are more susceptible to corrosion.
Subjects/Keywords: 669; Aluminium alloy; Corrosion; Intermetallic particles
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Luo, C. (2011). Role of microstructure on corrosion control of AA2024-T3 aluminium alloy. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/role-of-microstructure-on-corrosion-control-of-aa2024t3-aluminium-alloy(6954f1a8-920e-4242-bfb4-437be7d27127).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542783
Chicago Manual of Style (16th Edition):
Luo, Chen. “Role of microstructure on corrosion control of AA2024-T3 aluminium alloy.” 2011. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/role-of-microstructure-on-corrosion-control-of-aa2024t3-aluminium-alloy(6954f1a8-920e-4242-bfb4-437be7d27127).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542783.
MLA Handbook (7th Edition):
Luo, Chen. “Role of microstructure on corrosion control of AA2024-T3 aluminium alloy.” 2011. Web. 11 Apr 2021.
Vancouver:
Luo C. Role of microstructure on corrosion control of AA2024-T3 aluminium alloy. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Apr 11].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/role-of-microstructure-on-corrosion-control-of-aa2024t3-aluminium-alloy(6954f1a8-920e-4242-bfb4-437be7d27127).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542783.
Council of Science Editors:
Luo C. Role of microstructure on corrosion control of AA2024-T3 aluminium alloy. [Doctoral Dissertation]. University of Manchester; 2011. Available from: https://www.research.manchester.ac.uk/portal/en/theses/role-of-microstructure-on-corrosion-control-of-aa2024t3-aluminium-alloy(6954f1a8-920e-4242-bfb4-437be7d27127).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542783
University of Manchester
13.
Ma, Yanlong.
Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy.
Degree: PhD, 2011, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/effect-of-microstructure-on-corrosion-resistance-and-anodising-behaviour-of-aa-2099t8-aluminium-alloy(6d3576ea-25d0-4d56-9cf3-735156cb0408).html
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529200
► The effect of microstructure on corrosion resistance and anodising behaviour of a 3rd generation lithium-containing aluminium alloy, AA 2099-T8, has been studied. Microstructural characterisation of…
(more)
▼ The effect of microstructure on corrosion resistance and anodising behaviour of a 3rd generation lithium-containing aluminium alloy, AA 2099-T8, has been studied. Microstructural characterisation of the alloy has shown elongated grains with high angle grain boundaries and approximately equiaxed subgrains with low angle grain boundaries. Two types of constituent particles of high and reduced contents of copper were found, which are present individually or in the form of multiphase particles. The alloy also contains rod-like Al-Cu-Mn-Li and spherical (Al3Zr) dispersoids, and fine age hardening precipitates of T1 (Al2CuLi), (Al3Li) and (Al2Cu).Immersion testing in a chloride-containing solution revealed two types of localised corrosion sites: one was initiated from intermetallics and quickly became passivated; the other lasted for the course of testing, with extensive boundary attack. The latter has been correlated to grains and subgrains with relatively high stored energy.Alkaline etching removed intermetallics from alloy surface; generated a copper-enriched layer in the alloy matrix immediately beneath the residual alumina film; and gradually developed a surface nanotexture. The surface nanotexture has been correlated to the formation of copper-rich nanoparticles within the copper-enriched layer.Anodising the alloy in tartaric-sulphuric acid disclosed that copper in the alloy matrix could be occluded in the anodic film material as copper-rich nanoparticles or be oxidized and incorporated into the film material as copper ions, depending on the anodising voltage. In the latter case, the process was accompanied by oxygen gas generation within the film material, forming anodic films with lateral porosity. Intermetallics of different compositions behaved differently during anodising, leading to modification of the morphology and composition of anodic films. Concerning the effect of alkaline etching on anodising behaviour of the alloy, the removal of intermetallics increased anodising efficiency; the pre-developed copper-enriched layer advanced the establishment of the steady-state film/alloy interface. Variation of copper-enriched layer structure is revealed by the detection of copper-rich nanoparticles in the copper-enriched layer. The copper-rich nanoparticles have structures consistent with either θ", θ' or θ phases. Machining damage can be detected not only by chromic acid anodising (CAA) but also by tartaric-sulphuric acid anodising (TSAA). Neither CAA nor TSAA can be used for detecting shallow corrosion pits.
Subjects/Keywords: 669; AA 2099 aluminium alloy; Corrosion; Anodising
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ma, Y. (2011). Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/effect-of-microstructure-on-corrosion-resistance-and-anodising-behaviour-of-aa-2099t8-aluminium-alloy(6d3576ea-25d0-4d56-9cf3-735156cb0408).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529200
Chicago Manual of Style (16th Edition):
Ma, Yanlong. “Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy.” 2011. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/effect-of-microstructure-on-corrosion-resistance-and-anodising-behaviour-of-aa-2099t8-aluminium-alloy(6d3576ea-25d0-4d56-9cf3-735156cb0408).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529200.
MLA Handbook (7th Edition):
Ma, Yanlong. “Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy.” 2011. Web. 11 Apr 2021.
Vancouver:
Ma Y. Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Apr 11].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/effect-of-microstructure-on-corrosion-resistance-and-anodising-behaviour-of-aa-2099t8-aluminium-alloy(6d3576ea-25d0-4d56-9cf3-735156cb0408).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529200.
Council of Science Editors:
Ma Y. Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy. [Doctoral Dissertation]. University of Manchester; 2011. Available from: https://www.research.manchester.ac.uk/portal/en/theses/effect-of-microstructure-on-corrosion-resistance-and-anodising-behaviour-of-aa-2099t8-aluminium-alloy(6d3576ea-25d0-4d56-9cf3-735156cb0408).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529200
14.
Jordan, Aaron.
Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011.
Degree: PhD, 2017, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-characterization-and-corrosion-properties-of-two-recycled-aluminium-alloys-aa5050-and-aa6011(b2cd54d8-c3c4-4422-8af6-a3c3584de285).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728242
► The influence of recycling on aluminium alloys and subsequent influence on the microstructure and corrosion performances have been investigated. The investigation was commenced by taking…
(more)
▼ The influence of recycling on aluminium alloys and subsequent influence on the microstructure and corrosion performances have been investigated. The investigation was commenced by taking two block cast, recycled aluminium alloys (AA5050 and AA6011) and rolling them into 1mm gauge plate. In the case of AA6011, the plate was subjected to subsequent solution heat treatment and artificial aging steps, in order to attain certain temper specifications. To replicate the automotive paint bake industrial practice, a sample was subjected to a 2% tensile stretch followed by heat treatment for 30 minutes at 180˚C. Microstructural observations revealed Al-Fe-Mn-Si intermetallics to be the dominant secondary phase in both alloys. The size, distribution and composition of these were unaffected by artificial aging. Mg2Si was found in a coarse, localised form in both alloys also, albeit in much less amounts in AA5050. The presence of this phase was likely due to poor homogenisation during thermomechanical processing. HR-TEM of AA6011 revealed needle/rod shaped precipitates, aligning in the [001]Al lattice direction. This is consistent with β''/β' hardening precipitates consisting of magnesium and silicon. Circumstantial evidence was found for the copper-containing Q phase precipitate also. An additional, unidentified precipitate was observed, nucleating on the {111} habit plane of the aluminium matrix. The high iron content of AA6011 retarded the precipitation hardening response by capturing elements associated with hardening precipitates in the Al-Fe-Mn-Si intermetallics. Electrochemical corrosion experiments revealed the materials had a high susceptibility to localised corrosions, with the open circuit potential and breakdown potential possessing similar values. Atmospheric corrosion experiments showed that artificial aging had a large influence on the preferred corrosion mechanism. Non-heat treated samples showed susceptibility for pitting corrosion. This was particularly true for the -T4P temper, which showed large scale pitting. Heat treated samples saw an introduced susceptibility to intergranular corrosion. This was attributed to precipitation at grain boundaries, which would then form a microgalvanic couple with adjacent depleted zones. In the case of the -T8P temper, tensile stretching introduced defects into the sub-grain microstructure. This resulted in intergranular corrosion fronts of increased width, where grains with higher stored energy undergo preferential dissolution alongside the grain boundary attack. Overall, the detrimental effects of high iron content need to be overcome before AA5050 and AA6011 can be seriously considered for use in the automotive industry. However, the corrosion performance of AA6011-T8P is encouraging.
Subjects/Keywords: 620.1; Aluminium Alloy; Recycling; Automotive Industry
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Manager
APA (6th Edition):
Jordan, A. (2017). Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/microstructure-characterization-and-corrosion-properties-of-two-recycled-aluminium-alloys-aa5050-and-aa6011(b2cd54d8-c3c4-4422-8af6-a3c3584de285).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728242
Chicago Manual of Style (16th Edition):
Jordan, Aaron. “Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/microstructure-characterization-and-corrosion-properties-of-two-recycled-aluminium-alloys-aa5050-and-aa6011(b2cd54d8-c3c4-4422-8af6-a3c3584de285).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728242.
MLA Handbook (7th Edition):
Jordan, Aaron. “Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011.” 2017. Web. 11 Apr 2021.
Vancouver:
Jordan A. Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 11].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-characterization-and-corrosion-properties-of-two-recycled-aluminium-alloys-aa5050-and-aa6011(b2cd54d8-c3c4-4422-8af6-a3c3584de285).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728242.
Council of Science Editors:
Jordan A. Microstructure characterization and corrosion properties of two recycled aluminium alloys AA5050 and AA6011. [Doctoral Dissertation]. University of Manchester; 2017. Available from: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-characterization-and-corrosion-properties-of-two-recycled-aluminium-alloys-aa5050-and-aa6011(b2cd54d8-c3c4-4422-8af6-a3c3584de285).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728242
University of Cambridge
15.
Kurimura, Takayuki.
Residual stress effects on crack initiation and growth in Al/Sic MMCs.
Degree: PhD, 1996, University of Cambridge
URL: https://doi.org/10.17863/CAM.20062
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363869
Subjects/Keywords: 620.11223; Aluminium; Alloy
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MLA ·
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APA (6th Edition):
Kurimura, T. (1996). Residual stress effects on crack initiation and growth in Al/Sic MMCs. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.20062 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363869
Chicago Manual of Style (16th Edition):
Kurimura, Takayuki. “Residual stress effects on crack initiation and growth in Al/Sic MMCs.” 1996. Doctoral Dissertation, University of Cambridge. Accessed April 11, 2021.
https://doi.org/10.17863/CAM.20062 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363869.
MLA Handbook (7th Edition):
Kurimura, Takayuki. “Residual stress effects on crack initiation and growth in Al/Sic MMCs.” 1996. Web. 11 Apr 2021.
Vancouver:
Kurimura T. Residual stress effects on crack initiation and growth in Al/Sic MMCs. [Internet] [Doctoral dissertation]. University of Cambridge; 1996. [cited 2021 Apr 11].
Available from: https://doi.org/10.17863/CAM.20062 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363869.
Council of Science Editors:
Kurimura T. Residual stress effects on crack initiation and growth in Al/Sic MMCs. [Doctoral Dissertation]. University of Cambridge; 1996. Available from: https://doi.org/10.17863/CAM.20062 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363869
University of Leicester
16.
Al-Bhadle, Basim M. A.
The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy.
Degree: PhD, 2020, University of Leicester
URL: https://doi.org/10.25392/leicester.data.12652529.v1
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811561
► Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join metallic components. Heat is generated by friction between the…
(more)
▼ Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join metallic components. Heat is generated by friction between the rotating tool and the workpiece. In this study the effect of process parameters and tool geometry on heat generation during FSW is investigated through analytical and numerical modelling together experimental validation. Equations of tapered and straight tool profiles for triangular, square, pentagonal, hexagonal and octagonal geometries profiles have been derived first. The derived equations were then implemented in a finite element software package to model heat generation and thermal profile during FSW. Experimental validation was carried out using design of experimental (DOE) method for welding 6061-T6 aluminium alloy. The calculated thermal profiles agree with experimental data. It is found that the amount of heat generation increases with increasing number of flats, and taper ratio, and the highest temperature occurs in a straight octagonal tool profile which has 8 flats. The peak temperature increases around 19% by increase the number of probe flats from 3 to 8, and its taper ratio changes from 0.4 to 1. The tensile strength in experimental welded joints was tested to evaluate the effect of tool profile on mechanical properties. The transverse tensile strength increases approximately 33% by changing the tool profile from straight octagonal (SOct) to straight square (SSQ) due to producing defect free joints with symmetric hardness profiles. The tensile strength of SSQ joint is 79% of base metal strength were obtained using rotational speed of 1000 rpm and a welding speed of 200 mm/min.
Subjects/Keywords: Tool Profiles; Friction Stir Welding; Aluminium Alloy
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MLA ·
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APA (6th Edition):
Al-Bhadle, B. M. A. (2020). The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy. (Doctoral Dissertation). University of Leicester. Retrieved from https://doi.org/10.25392/leicester.data.12652529.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811561
Chicago Manual of Style (16th Edition):
Al-Bhadle, Basim M A. “The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy.” 2020. Doctoral Dissertation, University of Leicester. Accessed April 11, 2021.
https://doi.org/10.25392/leicester.data.12652529.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811561.
MLA Handbook (7th Edition):
Al-Bhadle, Basim M A. “The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy.” 2020. Web. 11 Apr 2021.
Vancouver:
Al-Bhadle BMA. The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy. [Internet] [Doctoral dissertation]. University of Leicester; 2020. [cited 2021 Apr 11].
Available from: https://doi.org/10.25392/leicester.data.12652529.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811561.
Council of Science Editors:
Al-Bhadle BMA. The effect of tool profiles on heat generation and distribution during friction stir welding of aluminium alloy. [Doctoral Dissertation]. University of Leicester; 2020. Available from: https://doi.org/10.25392/leicester.data.12652529.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811561
Anna University
17.
Senthil P.
Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;.
Degree: 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/26153
► Alloys of light metals such as aluminium titanium and magnesium are extensively used in automotive aerospace and military sectors since their light weight leads to…
(more)
▼ Alloys of light metals such as aluminium titanium
and magnesium are extensively used in automotive aerospace and
military sectors since their light weight leads to reduced energy
consumption increased fuel efficiency and better environmental
protection Particularly in automotive and aerospace sectors
utilization of aluminium alloy components has been increased during
the last two decades due to their desirable properties such as high
strength to weight ratio good castability good machinability and
excellent corrosion resistance Aluminium alloys are generally
processed through sand casting investment casting continuous
casting centrifugal casting gravity die casting and pressure die
casting Die casting techniques are widely employed for producing
intricate shaped castings in aluminium foundries Generally they
exhibit several casting defects such as gas porosities shrinkage
porosities segregations hot tears etc while processing some
aluminium alloys for the production of intricate shaped
parts
References p.162-173, Appendix
p.152-161
Advisors/Committee Members: Amirthagadeswaran K S.
Subjects/Keywords:
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CSE |
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APA (6th Edition):
P, S. (2014). Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26153
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
P, Senthil. “Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;.” 2014. Thesis, Anna University. Accessed April 11, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/26153.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
P, Senthil. “Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;.” 2014. Web. 11 Apr 2021.
Vancouver:
P S. Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Apr 11].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26153.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
P S. Optimization of squeeze casting process parameters for
AC2A aluminium alloy through experimental studies;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26153
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
18.
Qian, Daishu.
Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite.
Degree: PhD, 2016, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684800
► The present work studies the microstructure and corrosion behaviour of 25 vol.% SiCp/AA2124-T4 metal matrix composites (MMCs) and AA2124-T4 aluminium alloy; and also the capability…
(more)
▼ The present work studies the microstructure and corrosion behaviour of 25 vol.% SiCp/AA2124-T4 metal matrix composites (MMCs) and AA2124-T4 aluminium alloy; and also the capability of excimer laser surface melting (LSM) to improve the corrosion resistance of the SiCp/AA2124 MMC and the monolithic alloy (MA). Microstructural characterization has shown significant influence of the presence and size of SiC particles on the fine Al2Cu precipitate and Mg segregation at SiC/Al interfacial regions. Such precipitates are revealed to be active sites for corrosion initiation in the MMCs, while the preferential sites for corrosion initiation in the MA are the coarse intermetallics. Corrosion evaluation performed in a 0.6 M NaCl solution suggests that the corrosion resistance of the MMC reinforced with micrometre-sized SiC particles is inferior to that of the MA and the MMC reinforced with submicrometre-sized SiC particles. The submicrometre-sized SiC particles have little adverse effect on the corrosion resistance of the MMC due to the reduced interfacial precipitates. Thin films of up to several micrometres have been achieved by excimer LSM on both the MMC and the MA. The surface roughness and the thickness of the melted layer increase with increasing laser fluence. High number of pulses (40 P) results in significant porosity in the MA and networks of cracking in the MMC. A homogeneous layer without chemical segregation except the Cu-rich segregation bands has been obtained on the MA; while complex microstructures are observed for the MMC, including the Cu-rich segregation bands, Al-Si eutectic structure and microsegregation-free structure laid in sequence from the bottom of the melted layer to the top surface. The modelling work suggest that the presence of SiC particles gives rise in high temperatures in the melt pool, which is useful to explain the materials responses upon laser irradiation, such as decomposition of SiC, evaporation of matrix alloy, and oxides formation. The fast cooling rate up to 1011 K/s is responsible for the formation of microsegregation-free structure. Corrosion evaluation has indicated improvement of corrosion resistance of the MMC and the MA after excimer LSM due to the reduction of the intermetallics. For the laser-melted MA, the corrosion behaviour is governed by the surface morphology and the porosity. The significant rippled structure obtained under high laser fluence could lead to crevice corrosion in the valley between the ripples whilst the pores could provide penetrating routes for the chloride solution to reach the Cu-rich segregation bands, leading to the delamination of the melted layer. For the laser-melted MMC, corrosion mainly initiated at the SiC remnants, which are rich in Si. The corrosion sites of the laser-melted MMC are in the form of small cracked blisters.
Subjects/Keywords: 620.1; Aluminium alloy; Aluminium matrix composite; Laser surface melting; Corrosion
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qian, D. (2016). Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684800
Chicago Manual of Style (16th Edition):
Qian, Daishu. “Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684800.
MLA Handbook (7th Edition):
Qian, Daishu. “Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite.” 2016. Web. 11 Apr 2021.
Vancouver:
Qian D. Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 11].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684800.
Council of Science Editors:
Qian D. Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite. [Doctoral Dissertation]. University of Manchester; 2016. Available from: https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684800
19.
Qian, Daishu.
MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE.
Degree: 2016, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:295589
► The present work studies the microstructure and corrosion behaviour of 25 vol.% SiCp/AA2124-T4 metal matrix composites (MMCs) and AA2124-T4 aluminium alloy; and also the capability…
(more)
▼ The present work studies the microstructure and
corrosion behaviour of 25 vol.% SiCp/AA2124-T4 metal matrix
composites (MMCs) and AA2124-T4 aluminium
alloy; and also the
capability of excimer laser surface melting (LSM) to improve the
corrosion resistance of the SiCp/AA2124 MMC and the monolithic
alloy (MA). Microstructural characterization has shown significant
influence of the presence and size of SiC particles on the fine
Al2Cu precipitate and Mg segregation at SiC/Al interfacial regions.
Such precipitates are revealed to be active sites for corrosion
initiation in the MMCs, while the preferential sites for corrosion
initiation in the MA are the coarse intermetallics. Corrosion
evaluation performed in a 0.6 M NaCl solution suggests that the
corrosion resistance of the MMC reinforced with micrometre-sized
SiC particles is inferior to that of the MA and the MMC reinforced
with submicrometre-sized SiC particles. The submicrometre-sized SiC
particles have little adverse effect on the corrosion resistance of
the MMC due to the reduced interfacial precipitates.Thin films of
up to several micrometres have been achieved by excimer LSM on both
the MMC and the MA. The surface roughness and the thickness of the
melted layer increase with increasing laser fluence. High number of
pulses (40 P) results in significant porosity in the MA and
networks of cracking in the MMC. A homogeneous layer without
chemical segregation except the Cu-rich segregation bands has been
obtained on the MA; while complex microstructures are observed for
the MMC, including the Cu-rich segregation bands, Al-Si eutectic
structure and microsegregation-free structure laid in sequence from
the bottom of the melted layer to the top surface. The modelling
work suggest that the presence of SiC particles gives rise in high
temperatures in the melt pool, which is useful to explain the
materials responses upon laser irradiation, such as decomposition
of SiC, evaporation of matrix
alloy, and oxides formation. The fast
cooling rate up to 1011 K/s is responsible for the formation of
microsegregation-free structure.Corrosion evaluation has indicated
improvement of corrosion resistance of the MMC and the MA after
excimer LSM due to the reduction of the intermetallics. For the
laser-melted MA, the corrosion behaviour is governed by the surface
morphology and the porosity. The significant rippled structure
obtained under high laser fluence could lead to crevice corrosion
in the valley between the ripples whilst the pores could provide
penetrating routes for the chloride solution to reach the Cu-rich
segregation bands, leading to the delamination of the melted layer.
For the laser-melted MMC, corrosion mainly initiated at the SiC
remnants, which are rich in Si. The corrosion sites of the
laser-melted MMC are in the form of small cracked
blisters.
Advisors/Committee Members: Liu, Zhu.
Subjects/Keywords: Aluminium alloy; Aluminium matrix composite; Laser surface melting; Corrosion
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qian, D. (2016). MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:295589
Chicago Manual of Style (16th Edition):
Qian, Daishu. “MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:295589.
MLA Handbook (7th Edition):
Qian, Daishu. “MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE.” 2016. Web. 11 Apr 2021.
Vancouver:
Qian D. MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:295589.
Council of Science Editors:
Qian D. MICROSTRUCTURE AND CORROSION PERFORMANCE OF EXCIMER
LASER-MELTED AA2124-T4 ALUMINIUM ALLOY AND SiCP/AA2124-T4
COMPOSITE. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:295589
University of Waterloo
20.
Orlov, Oleg.
A three-dimensional damage percolation model.
Degree: 2007, University of Waterloo
URL: http://hdl.handle.net/10012/2659
► A combined experimental and analytical approach is used to study damage initiation and evolution in three-dimensional second phase particle fields. A three-dimensional formulation of a…
(more)
▼ A combined experimental and analytical approach is used to study damage initiation and evolution in three-dimensional second phase particle fields. A three-dimensional formulation of a damage percolation model is developed to predict damage nucleation and propagation through random-clustered second phase particle fields. The proposed approach is capable of capturing the three-dimensional character of damage phenomena and the three stages of ductile fracture, namely void nucleation, growth, and coalescence, at the level of discrete particles.
The experimental work focuses on the acquisition of second phase particle field data and measurement of damage development during plastic deformation. Two methods of acquisition of three-dimensional second phase particle fields are considered. The first method utilizes three-dimensional X-ray tomography for the acquisition of real microstructural data. The second method involves statistical stereological reconstruction of second phase particle fields from two orthogonal metallographic sections of the as-received material. The reconstruction method is also used to introduce parametric variation of key microstructural parameters to support a study of the effect of particle clustering and second phase constituent content on formability.
An in situ tensile test with X-ray tomography is utilized to quantify material damage during deformation in terms of the number of nucleated voids and porosity. The results of this experiment are used for both the development of a clustering-sensitive nucleation criterion and the validation of the damage percolation predictions.
The three-dimensional damage percolation model is developed based on the acquired second phase particle fields and the damage evolution characterization using the results of the in situ tensile test. Void nucleation, growth, and coalescence are modelled within the considered second phase particle field. The damage percolation model is coupled with a commercial finite element code, LS-DYNA.
The damage percolation model is applied to simulate the in situ tensile test as well as to study bendability. In particular, the effect of second phase particle field parameters on formability is examined. The volume fraction of Fe-rich and Mg2Si particles is shown to be of critical importance in controlling the formability of aluminum alloy AA5182.
This study of microstructural heterogeneity using the damage percolation model has resulted in a more fundamental understanding of the processes of material degradation during deformation in the presence of second phase particles. The results of the study indicate a significant effect of second phase content on formability and provide practical recommendations to improve material formability in future alloy designs.
Subjects/Keywords: damage; aluminum alloy
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Orlov, O. (2007). A three-dimensional damage percolation model. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/2659
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Orlov, Oleg. “A three-dimensional damage percolation model.” 2007. Thesis, University of Waterloo. Accessed April 11, 2021.
http://hdl.handle.net/10012/2659.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Orlov, Oleg. “A three-dimensional damage percolation model.” 2007. Web. 11 Apr 2021.
Vancouver:
Orlov O. A three-dimensional damage percolation model. [Internet] [Thesis]. University of Waterloo; 2007. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10012/2659.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Orlov O. A three-dimensional damage percolation model. [Thesis]. University of Waterloo; 2007. Available from: http://hdl.handle.net/10012/2659
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
21.
krishnan, charanya.
Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions.
Degree: MASc, 2011, McMaster University
URL: http://hdl.handle.net/11375/9344
► A study was undertaken to achieve a better understanding of the key microstructure-performance relationships involved with the intergranular corrosion and exfoliation corrosion of Cu-lean…
(more)
▼ A study was undertaken to achieve a better understanding of the key microstructure-performance relationships involved with the intergranular corrosion and exfoliation corrosion of Cu-lean AA7003
alloy extrusions, as a function of the heat-treated condition. The heat treatments of interest in this study include the naturally-aged T4 condition, representing the as-extruded condition, an artificially-aged T6 condition, representing a post-weld stress-relief condition, and an artificially-aged automotive paint-bake cycle condition. The influence of heat treatment on the resultant microstructure is characterized using light optical microscopy, coupled with image analysis, and electron (scanning & transmission) microscopy, coupled with energy dispersive spectroscopy. The influence of heat treatment on the corrosion behaviour is characterized using anodic polarization measurements and ASTM standardized testing to evaluate the susceptibility resistance to intergranular corrosion (ASTM G110) and exfoliation corrosion (ASTM G34). The cross-sectional (LT-ST & L-ST) microstructures of all three heat treatments consist of a fibrous, non-recrystallized grain structure in the interior, and a coarse recrystallized grain structure at the exterior surface. Both grain structures are slightly elongated along L-direction. The grain size distribution and grain aspect ratio distribution is weakly dependant on the heat treatment applied, and on the orientation plane. Among the two artificial aging, the T6 (post-weld stress-relief) condition has the higher micro-hardness (yield strength), as it has higher density (volume fraction) of the strengthening MgZn
2-type precipitates (η, η′ and their GP zones) within the Al matrix grains. Anodic polarization measurements show a more negative corrosion potential (E
corr) for the two artificially aging heat-treated conditions. The shift is believed to be due to the micro-galvanic cell activity established between the more noble Al matrix grains and the more active strengthening MgZn
2-type precipitates within the Al matrix grains, which have a significantly increased surface area (volume fraction) in the artificially-aged condition. A similar, single breakdown potential (E
b) corresponding to a pitting potential (E
pit) is observed, regardless of the heat-treated condition. The similar potential is believed to be due to localized breakdown of the passive film at the periphery of coarse second phase intermetallic particles (Al
3Fe), which remain unaffected by artificial aging. Of the three heat-treated conditions studied, the T6 condition exhibits the lowest susceptibility to both intergranular corrosion and exfoliation corrosion. The lower susceptibility is believed to be due to the lack of any Cu enrichment in across the grain boundary region (either in the solute depted zone or in the generic Mg(Zn,CuAl)
2 grain boundary precipitates). This lack of enrichment is believed to produce a smaller micro-galvanic…
Advisors/Committee Members: Kish, Joseph, Materials Science and Engineering.
Subjects/Keywords: aluminum alloy; exfoliation corrosion; microstructure; Engineering; Engineering
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APA (6th Edition):
krishnan, c. (2011). Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/9344
Chicago Manual of Style (16th Edition):
krishnan, charanya. “Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions.” 2011. Masters Thesis, McMaster University. Accessed April 11, 2021.
http://hdl.handle.net/11375/9344.
MLA Handbook (7th Edition):
krishnan, charanya. “Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions.” 2011. Web. 11 Apr 2021.
Vancouver:
krishnan c. Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions. [Internet] [Masters thesis]. McMaster University; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/11375/9344.
Council of Science Editors:
krishnan c. Localized Corrosion Behaviour of Cu-lean AA 7003 Extrusions. [Masters Thesis]. McMaster University; 2011. Available from: http://hdl.handle.net/11375/9344
University of Windsor
22.
Cui, Zeyuan.
Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2016, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5726
► This study examines the tribological behaviour of AA6061 alloy sheets at elevated temperatures including a study of the deformation mechanisms and their effects on friction…
(more)
▼ This study examines the tribological behaviour of AA6061
alloy sheets at elevated temperatures including a study of the deformation mechanisms and their effects on friction behaviour. The role of the atmosphere is given particular importance when studying the surface morphology and that developed during high temperature deformation.
Friction tests were performed with an operating temperature range of 350 to 545°C, using strain rates between 1x10-2 and 4x10-2s-1. The measured COF in argon was higher than that in air due to the absence of fresh oxide layer formed inside the sliding track. Junction strength tests were performed in air and argon for the AA6061
alloy. The junction strength of AA6061 in argon was higher than that measured in air as no oxide layer formed on the surface of
alloy.
Advisors/Committee Members: Alpas, Ahmet.
Subjects/Keywords: Aluminum alloy; Elevated temperatures; Friction; Plastic deformation
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APA (6th Edition):
Cui, Z. (2016). Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5726
Chicago Manual of Style (16th Edition):
Cui, Zeyuan. “Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures.” 2016. Masters Thesis, University of Windsor. Accessed April 11, 2021.
https://scholar.uwindsor.ca/etd/5726.
MLA Handbook (7th Edition):
Cui, Zeyuan. “Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures.” 2016. Web. 11 Apr 2021.
Vancouver:
Cui Z. Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures. [Internet] [Masters thesis]. University of Windsor; 2016. [cited 2021 Apr 11].
Available from: https://scholar.uwindsor.ca/etd/5726.
Council of Science Editors:
Cui Z. Effect of Plastic Deformation on Friction Behaviour of Aluminum Sheets at Elevated Temperatures. [Masters Thesis]. University of Windsor; 2016. Available from: https://scholar.uwindsor.ca/etd/5726
University of Windsor
23.
Barberis Pinlung, Sergio.
7xxx Aluminum Sheets for Automotive Applications.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5504
► The automotive industry is interested to reduce vehicles weight, because of the need to reduce the fleet fuel consumption. Within this scenario, high strength…
(more)
▼ The automotive industry is interested to reduce vehicles weight, because of the need to reduce the fleet fuel consumption. Within this scenario, high strength
aluminum alloys are a viable alternative to heavier steel currently adopted. In particular 7xxx series
aluminum alloys, due to their excellent strength to weight ratio, are drawing the attention of carmakers. The development of a proper precipitation hardening process is extremely important in order to obtain the best results in terms of strength and it is what has been done in this work for the
alloy 7046. This thesis evaluates the microhardness and tensile testing results. The latter were performed at room temperature, at warm forming temperature and after the
alloy was heated up to different temperatures for 5 minutes, at the end of different artificial ageing treatments.
Advisors/Committee Members: Edrisy, Afsaneh.
Subjects/Keywords: 7046; 7xxx; Alloy; Aluminum; Forming; Tensile
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APA (6th Edition):
Barberis Pinlung, S. (2015). 7xxx Aluminum Sheets for Automotive Applications. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5504
Chicago Manual of Style (16th Edition):
Barberis Pinlung, Sergio. “7xxx Aluminum Sheets for Automotive Applications.” 2015. Masters Thesis, University of Windsor. Accessed April 11, 2021.
https://scholar.uwindsor.ca/etd/5504.
MLA Handbook (7th Edition):
Barberis Pinlung, Sergio. “7xxx Aluminum Sheets for Automotive Applications.” 2015. Web. 11 Apr 2021.
Vancouver:
Barberis Pinlung S. 7xxx Aluminum Sheets for Automotive Applications. [Internet] [Masters thesis]. University of Windsor; 2015. [cited 2021 Apr 11].
Available from: https://scholar.uwindsor.ca/etd/5504.
Council of Science Editors:
Barberis Pinlung S. 7xxx Aluminum Sheets for Automotive Applications. [Masters Thesis]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5504
University of South Carolina
24.
Dash, Sritam Kumar.
Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219.
Degree: Degree ofMSin Mechanical Engineering, Mechanical Engineering, 2019, University of South Carolina
URL: https://scholarcommons.sc.edu/etd/5583
► This thesis discusses WAAM (wire arc additive manufacturing) technology using TIG (Tungsten Inert Gas) welding method with aluminum 2219 as the substrate and aluminum…
(more)
▼ This thesis discusses WAAM (wire arc additive manufacturing) technology using TIG (Tungsten Inert Gas) welding method with
aluminum 2219 as the substrate and
aluminum 2319 as the filler material. The most important characteristic of this method of manufacturing is very little wastage of material as it does not follow the conventional method of manufacturing where material is removed from a bigger block to finally achieve the desired shape. This method uses a layer by layer approach to build the part. Generally, in additive manufacturing, the production time may vary depending on the type of method used. The material deposition rate in WAAM is one of the highest among all the processes.
A DOE (design of experiment) was performed with three independent variables namely (i) welding speed, (ii) wire feed rate and (iii) current. The resultant extent of the actual material deposition with respect to the desired bead shape was studied using this DOE. The topics discussed here are the equipment, process parameters involved in this method and their optimization to achieve the desired shape with suitable mechanical properties. Full factorial designs using Minitab were created with the aforementioned factors with three levels of input values for each parameter. The output was studied from the main effects plots and the interaction plots of the variables. These efforts intend to discuss the effects of the heat input on the bead shape with a combination of the wire feed and welding speed.
In addition to the weld bead geometry, the hardness of the deposited material was tested by a Vicker’s hardness tester by creating a contour plot on the weld beads and
thereafter the heat affected zone was also studied. In order to verify the change in the mechanical properties of the specimens, a heat treatment was conducted to achieve a T6 conditioning according to the ASM Handbook, Volume 4 [1] and a hardness test was conducted on the same samples. Another important aspect studied in this research was the porosity in the weld beads. The percentage of holes per unit area of the weld beads was studied by the point counting method [2].
Advisors/Committee Members: Anthony P. Reynolds.
Subjects/Keywords: Mechanical Engineering; wire; arc; aluminum; alloy; 2219
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APA (6th Edition):
Dash, S. K. (2019). Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219. (Thesis). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/5583
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dash, Sritam Kumar. “Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219.” 2019. Thesis, University of South Carolina. Accessed April 11, 2021.
https://scholarcommons.sc.edu/etd/5583.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dash, Sritam Kumar. “Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219.” 2019. Web. 11 Apr 2021.
Vancouver:
Dash SK. Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219. [Internet] [Thesis]. University of South Carolina; 2019. [cited 2021 Apr 11].
Available from: https://scholarcommons.sc.edu/etd/5583.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dash SK. Study of Wire Arc Additive Manufacturing With Aluminum Alloy 2219. [Thesis]. University of South Carolina; 2019. Available from: https://scholarcommons.sc.edu/etd/5583
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
25.
wu, chufan.
Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy.
Degree: MASc, 2019, McMaster University
URL: http://hdl.handle.net/11375/25004
► High pressure die casting (HPDC) is both a cost-efficient and high throughput method for making near-net shape castings. 7xxx series aluminum alloys are excellent candidates…
(more)
▼ High pressure die casting (HPDC) is both a cost-efficient and high throughput method for making near-net shape castings. 7xxx series aluminum alloys are excellent candidates for manufacturing structural components for significant light-weighting opportunities in the automotive industry. This project explores the development of a new 7xxx series aluminum alloy with iron additions to improve castability. The main objective of this project is to develop an optimized heat treatment process for the new Al-Zn-Mg-Fe alloy to achieve solute homogenization in the primary Al grains.
The rationale behind adding iron as an alloying element was presented, as well as an analysis of the Al-Fe intermetallic phases to show their mitigating effects on hot tearing.
A detailed analysis of the casting quality was carried out, including detailed microstructural analyses of defects and defect-free castings, correlating process parameters, shot profiles, uniaxial tensile properties, and fractography. Improvements on casting conditions and parameters were suggested.
Solution heat treatments were carried out between 0.25 and 24 hours and quenched with forced air. Bulk hardness measurements were obtained following solution heat treatment to determine the arrest times for the precipitation reactions during natural aging. The uniaxial tensile properties of the alloy in the F- and T4-tempers were presented. Microstructural analyses of the alloy were carried out by optical and electron microscopy (SEM), including phase identification, phase fraction, average grain size, and distribution.
A predictive model for the homogenization of the solutes in the Al matrix was developed using a one-dimensional diffusion model with spherical geometry, and a MATLAB code was developed to time for complete homogenization. Electron-dispersive X-ray spectroscopy (EDX) line scans were carried out on the F and T4 samples (0.25-2h) and the concentration profiles of Zn and Mg (the diffusing solutes) were extracted and analyzed. The models were verified and validated with experiment data.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: shankar, sumanth, Mechanical Engineering.
Subjects/Keywords: metallography; structural casting; high pressure die casting; alloy development; aluminum alloy
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APA (6th Edition):
wu, c. (2019). Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/25004
Chicago Manual of Style (16th Edition):
wu, chufan. “Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy.” 2019. Masters Thesis, McMaster University. Accessed April 11, 2021.
http://hdl.handle.net/11375/25004.
MLA Handbook (7th Edition):
wu, chufan. “Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy.” 2019. Web. 11 Apr 2021.
Vancouver:
wu c. Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy. [Internet] [Masters thesis]. McMaster University; 2019. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/11375/25004.
Council of Science Editors:
wu c. Quantitative Metallography, Optimization of HVHPC Process and Modelling Solute Homogenization During Solutionizing of Al-4Zn-1Mg-1.2Fe-0.1Ti Alloy. [Masters Thesis]. McMaster University; 2019. Available from: http://hdl.handle.net/11375/25004
University of Waterloo
26.
Tadgell, Colin.
Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys.
Degree: 2015, University of Waterloo
URL: http://hdl.handle.net/10012/9072
► The effect of surface oxides and the presence of ternary constituents were examined using differential scanning calorimetry (DSC) along with SEM, EDX, and TEM studies…
(more)
▼ The effect of surface oxides and the presence of ternary constituents were examined using differential scanning calorimetry (DSC) along with SEM, EDX, and TEM studies to quantitatively analyze the role of nickel in its use as a fluxless braze promoter for aluminum alloys during brazing. This braze promoter exhibits an exothermic reaction due to intermetallic reaction with neighboring aluminum and silicon which disrupts the tenacious surface oxide allowing molten liquid to flow. Seven surface conditions were created with various oxide thicknesses and surface chemistries to better understand their role in this fluxless brazing process. These surface altered coupons were then sputtered with various nickel thicknesses. DSC and post characterization techniques confirmed that a larger surface oxide poses a barrier to this intermetallic reaction and that nickel still remained present on the surface.
Subjects/Keywords: Aluminum Alloy; Brazing; Nickel; Thermal Analysis; Differential Scanning Calorimetry; Aluminum Oxide
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APA (6th Edition):
Tadgell, C. (2015). Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9072
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tadgell, Colin. “Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys.” 2015. Thesis, University of Waterloo. Accessed April 11, 2021.
http://hdl.handle.net/10012/9072.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tadgell, Colin. “Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys.” 2015. Web. 11 Apr 2021.
Vancouver:
Tadgell C. Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10012/9072.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tadgell C. Investigation of Plating Process Variability and Mechanism for Oxide Disruption in a Ni-Modified Fluxless Brazing Process for Aluminum Alloys. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9072
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
27.
L'Haridon – Quaireau, Sarah.
Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure.
Degree: Docteur es, Énergie nucléaire, 2020, université Paris-Saclay
URL: http://www.theses.fr/2020UPASS047
► Les Materials Testing Reactors (MTR) sont des réacteurs expérimentaux nucléaires utilisés dans le but d’irradier des matériaux. Les alliages d’aluminium en particulier l’alliage 6061-T6 sont…
(more)
▼ Les Materials Testing Reactors (MTR) sont des réacteurs expérimentaux nucléaires utilisés dans le but d’irradier des matériaux. Les alliages d’aluminium en particulier l’alliage 6061-T6 sont utilisés dans les MTR pour les gaines de combustibles ou les éléments de structures du cœur nucléaire. Dans le milieu aqueux du cœur, ces alliages se corrodent et un film d’hydroxyde d’aluminium recouvre leur surface. Ayant une mauvaise conductivité thermique, ce film dégrade les échanges thermiques entre les éléments du cœur et le milieu aqueux, ce qui peut mener à une surchauffe. Il est donc important d’étudier la corrosion des alliages d’aluminium et de déterminer les épaisseurs d’hydroxyde à leur surface. Pour cela, il existe dans la littérature des modèles empiriques qui permettent d’estimer les épaisseurs d’hydroxyde selon les conditions de fonctionnement des réacteurs. Ces modèles ont été extrapolés à partir de données obtenues à la suite d’essais réalisés en boucle de corrosion à une température supérieure à 100°C. Dans les réacteurs expérimentaux français, la température maximale des éléments de structures du cœur est comprise entre 70 et 100°C. Ainsi, pour pouvoir utiliser ces modèles empiriques dans les réacteurs français, il est nécessaire d’élargir leur domaine d’application aux températures inférieures à 100°C. Pour cela, des études paramétriques ont été menées avec différentes valeurs de température (70-100°C), de pression (0,5-12 bar) et de pH (5-7,5). Il est montré que la température possède un important impact : l’alliage 6061-T6 se corrode plus et les épaisseurs d’hydroxydes sont plus importantes à 70°C qu’à 100°C. Ces observations sont associées à un changement de phase cristalline d’hydroxyde d’aluminium : l’hydroxyde formé à 70°C est moins protecteur que celui à 100°C. Le pH possède lui aussi un fort impact sur la croissance de l’hydroxyde. Notamment, un pH de 5 permet de diminuer les épaisseurs d’hydroxyde comparé à un pH de 7,5. Cependant, ces études paramétriques ne permettent pas d’adapter les modèles empiriques à une température inférieure à 100°C à cause de variations de pH en cours d’essai et d’une trop faible évolution des épaisseurs d’hydroxyde. D’avantages essais en boucle de corrosion sont nécessaires.Aussi, en réacteur, l’alliage 6061-T6 se corrodent sous flux neutronique. Selon la littérature, cette irradiation accélère la corrosion des alliages d’aluminium. Dans le but de savoir s’il est possible de se rapprocher des conditions trouvées en réacteur avec des irradiations ioniques, des irradiations aux ions ont été réalisées sur le métal non corrodé et sur l’hydroxyde. Une première irradiation aux ions Al réalisée sur la matrice d’aluminium à 14 dpa au maximum provoque une amorphisation des dispersoïdes et une augmentation du nombre de dislocations. Ces deux types de dommages semblent causer une augmentation des épaisseurs d’hydroxyde et de l’oxydation de l’aluminium. Ensuite, une deuxième irradiation aux ions Al a été réalisée sur l’hydroxyde pour un niveau de dommage de 4,5 dpa au maximum.…
Advisors/Committee Members: Delpech, Sylvie (thesis director).
Subjects/Keywords: Corrosion; Alliage d'aluminium; Hydroxyde d'aluminium; Irradiation; PH; Température; Corrosion; Aluminum alloy; Aluminium hydroxide; Irradiation; PH; Temperature
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APA (6th Edition):
L'Haridon – Quaireau, S. (2020). Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure. (Doctoral Dissertation). université Paris-Saclay. Retrieved from http://www.theses.fr/2020UPASS047
Chicago Manual of Style (16th Edition):
L'Haridon – Quaireau, Sarah. “Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure.” 2020. Doctoral Dissertation, université Paris-Saclay. Accessed April 11, 2021.
http://www.theses.fr/2020UPASS047.
MLA Handbook (7th Edition):
L'Haridon – Quaireau, Sarah. “Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure.” 2020. Web. 11 Apr 2021.
Vancouver:
L'Haridon – Quaireau S. Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure. [Internet] [Doctoral dissertation]. université Paris-Saclay; 2020. [cited 2021 Apr 11].
Available from: http://www.theses.fr/2020UPASS047.
Council of Science Editors:
L'Haridon – Quaireau S. Etude des mécanismes de corrosion et des effets d'irradiation sur la corrosion d'un alliage d'aluminium utilisé dans les réacteurs nucléaires expérimentaux : Study of corrosion processes and irradiation effect on aluminium alloys used for research reactors material structure. [Doctoral Dissertation]. université Paris-Saclay; 2020. Available from: http://www.theses.fr/2020UPASS047
University of Manchester
28.
Witkowska, Malgorzata Danuta.
INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION.
Degree: 2013, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191784
► The aluminium AA1050 alloy, known as commercially pure aluminium, contains 99.5% Al, together with Fe and Si as major alloying elements. During fabrication of aluminium…
(more)
▼ The aluminium AA1050
alloy, known as commercially
pure aluminium, contains 99.5% Al, together with Fe and Si as major
alloying elements. During fabrication of aluminium substrates for
lithographic printing plates in Bridgnorth Aluminium Ltd, the AA
1050 aluminium
alloy proceeds through various stages of
thermomechanical processing, with the conditions at each processing
stage influencing the microstructure of the final coil. Because of
its specific gravity, tensile strength, surface performance and
coating adhesion behaviour, the AA 1050 aluminium
alloy is one of
the preferred materials for offset printing, which has been the
dominant printing process for years. During manufacturing of the
offset plate, the AA 1050
alloy is subjected to alkaline etching,
electrograining and anodizing. Reactivity of the material to those
chemical and electrochemical processes depends on various
alloy
properties, the thickness and composition of oxide film over the
macroscopic
alloy surface, cold work applied and the presence of
second phase particles, which influence properties and quality of
the final product.During the project, the main objectives were to
understand the process in the production of the final product from
slab to coil as well as to investigate some microstructural changes
during the following stages of the production process and, finally,
the performance behaviour of the final product.The set of
experiments, including microstructural observation and
electrochemical tests, has been developed to investigate the AA
1050 aluminium sheet in accordance with the objective of this
study. Four homogenisation trials in the industry environment were
performed to enable sample collection from the real production
line; also, samples from each processing stage were examined with
the special attention paid to those collected during the plant
experimental homogenisation trials. It was found that the
microstructure of the aluminium changed throughout the different
production stages and influences the material response in the
alkaline solution used for etching. Furthermore, the conditions of
homogenisation (time and temperature) have impact on the properties
like the electrochemical behaviour in alkaline and acid solutions,
as well as the microstructure of the final aluminium sheet.
Differentiation between the behaviour of final gauge samples was
possible in terms of characterisation of the second phase particles
characterisation (distribution and composition) present in the
resultant
alloy product.
Advisors/Committee Members: Thompson, George.
Subjects/Keywords: AA 1050 aluminium alloy; production of flat rolled aluminium; electrochemical and chemical behaviour; microstructure
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APA (6th Edition):
Witkowska, M. D. (2013). INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191784
Chicago Manual of Style (16th Edition):
Witkowska, Malgorzata Danuta. “INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION.” 2013. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191784.
MLA Handbook (7th Edition):
Witkowska, Malgorzata Danuta. “INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION.” 2013. Web. 11 Apr 2021.
Vancouver:
Witkowska MD. INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Apr 11].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191784.
Council of Science Editors:
Witkowska MD. INTEROGATION OF THE MANUFACTURING ROUTE OF ALUMINIUM AA
1050 USED IN LITHOGRAPHIC APPLICATION. [Doctoral Dissertation]. University of Manchester; 2013. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191784
Anna University
29.
Vijay Ananth S.
Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites.
Degree: Mechanical Engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/17747
► Superplasticity is the ability of a material to exhibit very long neck free elongation prior to its failure. If the percentage of elongation is more…
(more)
▼ Superplasticity is the ability of a material to
exhibit very long neck free elongation prior to its failure. If the
percentage of elongation is more than 200% then the material has
superplastic forming capability and if the percentage of elongation
is less than 200% then it is referred as extended plasticity. The
material having high strain rate sensitivity index has more
elongation. The advantage of superplastic forming is that, near net
shape components can be produced which reduces the cost and weight.
Superplastic forming has applications in the field of aerospace,
automobile, architecture industries and medical applications. In
recent days the superplastic forming was done in aluminium metal
matrix composites. Aluminum based particulate Metal Matrix
Composites have combined properties of metallic and ceramic. The
properties of Aluminium Metal Matrix composites are high specific
strength and stiffness, low thermal expansion coefficient, improved
tribological properties and better high temperature strength. The
composites were prepared by stir casting process. Aluminium 6063
alloy, as matrix was used for production of Metal Matrix Composites
and SiC particles as reinforcement. Composites were prepared with
5%, 8% and 10% volumetric percentages of SiC particles. To refine
the grains, thermomechanical treatment was performed in the cast
components. Thermomechanical treatment has Solutionizing, warm
rolling and natural ageing processes. The cast composites were
solution treated at a temperature of 520 C and water quenched.
Quenched composites were warm rolled at a temperature of 400 C. The
thickness was reduced from 5 mm to 2.5 mm. The components were
naturally aged for three days. Equiaxed grains were formed through
thermomechanical treatment and it improved the superplastic
forming. After thermomechanical treatment, the SiC particles were
distributed uniformly throughout the matrix material. The
properties of the composites were tested by Tensile test and
Hardness test.
References p. 164-173
Advisors/Committee Members: Kalaichelvan K.
Subjects/Keywords: Aluminium 6063 alloy; Aluminium Metal Matrix composites; Metal Matrix Composites; SiC particles; Superplastic
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
S, V. A. (2014). Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/17747
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
S, Vijay Ananth. “Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites.” 2014. Thesis, Anna University. Accessed April 11, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/17747.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
S, Vijay Ananth. “Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites.” 2014. Web. 11 Apr 2021.
Vancouver:
S VA. Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Apr 11].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17747.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
S VA. Experimental and simulation analyses of superplastic
forming of A16063/SiCp composites. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17747
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
30.
Witkowska, Malgorzata Danuta.
Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application.
Degree: PhD, 2013, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574313
► The aluminium AA1050 alloy, known as commercially pure aluminium, contains 99.5% Al, together with Fe and Si as major alloying elements. During fabrication of aluminium…
(more)
▼ The aluminium AA1050 alloy, known as commercially pure aluminium, contains 99.5% Al, together with Fe and Si as major alloying elements. During fabrication of aluminium substrates for lithographic printing plates in Bridgnorth Aluminium Ltd, the AA 1050 aluminium alloy proceeds through various stages of thermomechanical processing, with the conditions at each processing stage influencing the microstructure of the final coil. Because of its specific gravity, tensile strength, surface performance and coating adhesion behaviour, the AA 1050 aluminium alloy is one of the preferred materials for offset printing, which has been the dominant printing process for years. During manufacturing of the offset plate, the AA 1050 alloy is subjected to alkaline etching, electrograining and anodizing. Reactivity of the material to those chemical and electrochemical processes depends on various alloy properties, the thickness and composition of oxide film over the macroscopic alloy surface, cold work applied and the presence of second phase particles, which influence properties and quality of the final product.During the project, the main objectives were to understand the process in the production of the final product from slab to coil as well as to investigate some microstructural changes during the following stages of the production process and, finally, the performance behaviour of the final product.The set of experiments, including microstructural observation and electrochemical tests, has been developed to investigate the AA 1050 aluminium sheet in accordance with the objective of this study. Four homogenisation trials in the industry environment were performed to enable sample collection from the real production line; also, samples from each processing stage were examined with the special attention paid to those collected during the plant experimental homogenisation trials. It was found that the microstructure of the aluminium changed throughout the different production stages and influences the material response in the alkaline solution used for etching. Furthermore, the conditions of homogenisation (time and temperature) have impact on the properties like the electrochemical behaviour in alkaline and acid solutions, as well as the microstructure of the final aluminium sheet. Differentiation between the behaviour of final gauge samples was possible in terms of characterisation of the second phase particles characterisation (distribution and composition) present in the resultant alloy product.
Subjects/Keywords: 669.722; AA 1050 aluminium alloy; production of flat rolled aluminium; electrochemical and chemical behaviour; microstructure
Record Details
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Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Witkowska, M. D. (2013). Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574313
Chicago Manual of Style (16th Edition):
Witkowska, Malgorzata Danuta. “Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application.” 2013. Doctoral Dissertation, University of Manchester. Accessed April 11, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574313.
MLA Handbook (7th Edition):
Witkowska, Malgorzata Danuta. “Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application.” 2013. Web. 11 Apr 2021.
Vancouver:
Witkowska MD. Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Apr 11].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574313.
Council of Science Editors:
Witkowska MD. Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application. [Doctoral Dissertation]. University of Manchester; 2013. Available from: https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574313
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Open Access Theses and Dissertations
