subject:(Intermetallic Alloys)

Indian Institute of Science

1. Tiwary, Chandra Sekhar. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2991

► The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions… (more)

▼ The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions in this system comprising of intermetallic phases distributed in different eutectic structures show ultra-high strength at temperatures upto 700°C combined with reasonable tensile plasticity, exceptional oxidation resistance and high temperature structural stability. Intermetallics have long been used in high temperature alloys systems such as in the classical Ni-base superalloys that derive their strength from nanoscale dispersions of the aluminide, Ni3Al(γ’) in a matrix of disordered fcc Ni (γ), alloyed with expensive, high density refractory elements such as Re and Ru. The high temperature applications of intermetallics derive from their strength retention to high temperatures, creep resistance enabled by low diffusion rates, and attractive oxidation resistance based on high concentration of elements such as Al that forms stable oxides. Several decades of effort on the development of new generation of intermetallic alloys through the 80’s and 90’s have gone unrewarded, with the exception of TiAl based alloys that are now used in recent generation aircraft engines. The promise of intermetallics as high temperature candidate materials is limited by their poor ductility or toughness arising from several intrinsic properties such as low grain boundary cohesive strength (in the case of Ni3Al) or an insufficient number of slip systems (as in NiAl) or extrinsic effects such as embrittlement by hydrogen (Fe3Al) that derive fundamentally from the existence of directionality in bonding. However, low ductility or toughness can often be alleviated by limiting the length scale for slip. We have therefore examined the possibility of combining intermetallics in the form of eutectic structures, potentially limiting slip lengths within each intermetallic constituent. Eutectic structures in binary systems limit the choice of intermetallic combinations so that finding such combinations with engineering potential is difficult. On the other hand combinations of three elements or more would enable a significantly larger set of permutations of eutectic intermetallics, provided the constituent binary phase diagrams contain either eutectic or peritectic reactions involving intermetallic phases, as well as intermediate intermetallic phases. The ternary Ni-Al-Zr system met our criterion in several ways. The Ni-Al binary phase diagram shows a peritectic reaction from liquid and NiAl (Pm 3m, B2 with a lattice parameter of 0.288nm) to form Ni3Al (Pm 3m, L12 with a lattice parameter of 0.356 nm), intermetallics that have been extensively investigated in earlier literature. The Ni-Zr system shows a peritectic reaction between liquid and the Ni7Zr2 (C12/m1 with a lattice parameters a=0.469nm, b=0.823nm, c=1.219nm) phase to form the intermetallic Ni5Zr (F 43m with a lattice parameter of 0.670nm). Further the NiAl and Ni7Zr2 are both intermediate phases… Advisors/Committee Members: Chattopadhyay, K (advisor), Banerjee, Dipankar (advisor).

Subjects/Keywords: Intermetallic Alloys; Nickel-Aluminium-Zirconium Eutectic Alloys; Ni-Al-Zr Alloys; Ternary Alloys; Intermetallic Eutectic Composites; Metallurgy

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APA (6^th Edition):

Tiwary, C. S. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2991

Chicago Manual of Style (16^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2991.

MLA Handbook (7^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2991.

Council of Science Editors:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2991

Nelson Mandela Metropolitan University

2. Otieno, Timothy. Shape memory Alloy Actuator for cross-feed in turning operation.

Degree: MA, Faculty of Engineering, the Built Environment and Information Technology, 2012, Nelson Mandela Metropolitan University

URL: http://hdl.handle.net/10948/d1012590

► A shape memory alloy (SMA) is an intermetallic compound able to recover, in a continuous and reversible way, a predetermined shape during a thermal cycle… (more)

Subjects/Keywords: Shape memory alloys – Mechanical properties; Shape memory alloys; Intermetallic compounds; Materials – Mechanical properties

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APA (6^th Edition):

Otieno, T. (2012). Shape memory Alloy Actuator for cross-feed in turning operation. (Masters Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/d1012590

Chicago Manual of Style (16^th Edition):

Otieno, Timothy. “Shape memory Alloy Actuator for cross-feed in turning operation.” 2012. Masters Thesis, Nelson Mandela Metropolitan University. Accessed January 16, 2021. http://hdl.handle.net/10948/d1012590.

MLA Handbook (7^th Edition):

Otieno, Timothy. “Shape memory Alloy Actuator for cross-feed in turning operation.” 2012. Web. 16 Jan 2021.

Vancouver:

Otieno T. Shape memory Alloy Actuator for cross-feed in turning operation. [Internet] [Masters thesis]. Nelson Mandela Metropolitan University; 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10948/d1012590.

Council of Science Editors:

Otieno T. Shape memory Alloy Actuator for cross-feed in turning operation. [Masters Thesis]. Nelson Mandela Metropolitan University; 2012. Available from: http://hdl.handle.net/10948/d1012590

3. Malavazi, Jefferson. Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn.

Degree: Mestrado, Tecnologia Nuclear - Materiais, 2014, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17032014-151816/ ;

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O objetivo deste trabalho foi determinar a influência do ferro e do manganês em uma liga de alumínio com 9% de silício (% em peso).… (more)

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O objetivo deste trabalho foi determinar a influência do ferro e do manganês em uma liga de alumínio com 9% de silício (% em peso). Para isto, foram elaboradas duas famílias de liga Al-9%Si: uma com os teores de 0,1%, 0,4%, 0,8% e 1,2% de Fe e uma segunda liga de Al-9%Si-0,8%Fe com teores de 0,1%, 0,4% e 0,7% de Mn. Para a realização deste estudo, foram produzidos corpos de prova de tração fundidos em coquilha, segundo a norma ASTM B108. Os corpos de prova obtidos foram tracionados para avaliação das propriedades mecânicas, em seguida, foram submetidos a uma análise microestrutural por microscopia óptica (MO) e eletrônica de varredura (MEV). As superfícies de fratura dos corpos de prova tracionados foram também observadas por MEV com a finalidade de comparar o efeito das adições de Fe e Mn. O efeito da adição crescente de Fe na liga Al-9%Si foi observado no ensaio de tração que mostrou queda tanto nos limites de resistência e de escoamento como no alongamento, decorrentes da formação da fase β-Al5FeSi que apresentou morfologia em plaquetas, interrompendo a continuidade da matriz de alumínio. Para teores abaixo de 0,4% de Fe, ocorreu um ligeiro aumento da resistência mecânica que pode ser atribuído à formação da fase α-Al8Fe2Si, que apresentou morfologia tipo escrita chinesa, que não interrompe a continuidade da matriz. Com adição de teores crescentes de Mn na liga Al-9%Si-0,8%Fe ocorreu uma elevação do limite de resistência e do alongamento, mas uma queda do limite de escoamento, quando comparados com a mesma liga sem adição de Mn. Conclui-se que esse comportamento pode ser atribuído a mudança de morfologia do intermetálico de plaquetas para escrita chinesa que intercala a matriz dúctil com a fase frágil, devido a adição do Mn.

This study aims to determine the influence of iron and manganese in an aluminum alloy with 9% silicon (% by weight). Were prepared two families of alloy Al-9%Si: one with the content of 0.1%, 0.4%, 0.8% and 1.2% Fe and a second alloy of Al-9% Si-0,8%Fe content of 0.1%, 0.4% and 0.7% Mn. For this study, tensile specimens were produced in permanent mold casting according to ASTM B108. The specimens obtained were pulled for quantitative evaluation of the mechanical properties and were subjected to a qualitative metallographic evaluation. Qualitative analysis of the bodies of tensile fracture test was conducted in order to compare the effect of additions of Fe and Mn. The effect of incremental addition of Fe in the alloy Al-9% Si was observed in the tensile test that showed a decrease in both the tensile and elongation flow as resulting from the formation of β-Al5FeSi phase platelet morphology showed that interrupting the continuity of aluminum matrix. To levels below 0.4% Fe, there was a slight increase in strength can be attributed to the formation of α-Al8Fe2Si phase morphology presented in chinese script that does not interrupt the continuity of the matrix. With addition of increasing concentrations of Mn in the alloy Al-9% Si-0, 8% Fe was an increase in the tensile…

Advisors/Committee Members: Couto, Antonio Augusto.

Subjects/Keywords: aluminium alloys; ferro; intermetálicos; intermetallic; iron; ligas de alumínio; manganês; manganese

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APA (6^th Edition):

Malavazi, J. (2014). Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17032014-151816/ ;

Chicago Manual of Style (16^th Edition):

Malavazi, Jefferson. “Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn.” 2014. Masters Thesis, University of São Paulo. Accessed January 16, 2021. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17032014-151816/ ;.

MLA Handbook (7^th Edition):

Malavazi, Jefferson. “Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn.” 2014. Web. 16 Jan 2021.

Vancouver:

Malavazi J. Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn. [Internet] [Masters thesis]. University of São Paulo; 2014. [cited 2021 Jan 16]. Available from: http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17032014-151816/ ;.

Council of Science Editors:

Malavazi J. Caracterização microestrutural dos compostos intermetálicos e seu efeito no comportamento mecânico nas ligas de Al-9%Si com adições de Fe e Mn. [Masters Thesis]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17032014-151816/ ;

Miami University

4. Alshammari, Ohud. EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS.

Degree: MS, Physics, 2016, Miami University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=miami1464184585

► A series of bulk and nanostructured ribbons of intermetallic alloys based on Ni-Mn-Ga have been fabricated and characterized. The samples have been fabricated by arc… (more)

Subjects/Keywords: Condensed Matter Physics; permanent magnet; melt spinning ribbons; intermetallic alloys; annealing

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APA (6^th Edition):

Alshammari, O. (2016). EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS. (Masters Thesis). Miami University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=miami1464184585

Chicago Manual of Style (16^th Edition):

Alshammari, Ohud. “EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS.” 2016. Masters Thesis, Miami University. Accessed January 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1464184585.

MLA Handbook (7^th Edition):

Alshammari, Ohud. “EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS.” 2016. Web. 16 Jan 2021.

Vancouver:

Alshammari O. EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS. [Internet] [Masters thesis]. Miami University; 2016. [cited 2021 Jan 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1464184585.

Council of Science Editors:

Alshammari O. EFFECT OF ANNEALING ON THE MICROSTRUCTURE AND MAGNETIC PROPERITES OF SELECTED (Ni-Mn-Ga) MELT-SPUN RIBBONS. [Masters Thesis]. Miami University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1464184585

Indian Institute of Science

5. Palit, Mithun. An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys.

Degree: PhD, Faculty of Engineering, 2016, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2520

► Giant magnetostrictive RFe2 type (R represents rare earths) intermetallics form an important class of magnetic materials keeping in view of their potential applications as sensors… (more)

▼ Giant magnetostrictive RFe2 type (R represents rare earths) intermetallics form an important class of magnetic materials keeping in view of their potential applications as sensors and/ or actuators. In this thesis, one such mixed rare earth compound (Tb,Dy)Fe2 has been chosen for investigations. Being a technologically important material system, several investigations concerning physical and magnetic properties of the material and effect of processing parameters on magnetic properties have been reported in the available literature. However, existing literature does not provide a clear insight into some important aspects such as phase equilibria, evolution of texture and microstructure of directionally solidified Tb-Dy-Fe alloys. Therefore, the present work was undertaken to bring out tangible process-structure-property correlations with an emphasis to clarify the grey areas in the available literature. The investigation on the nature of ternary phase equilibria of Tb-Dy-Fe was taken up with an aim to understand the effect of Tb/Dy ratio on phase equilibria and magnetic properties of TbxDy1-xFe1.95 (x=0-1) alloys. Microstructural and micro-chemical analysis along with study of lattice parameter has been used to predict the nature of phase equilibria and the deviation from the assumed pseudo-binary behaviour. Further, from the microstructural investigations and study of lattice parameter and Curie temperature, a schematic sketch of a section of the ternary diagram, where (Tb,Dy) / Fe =1.95, was formulated and presented. Directional solidification technique is the most widely adopted method for processing the (Tb,Dy)Fe2, to impart grain orientation for practical applications. Therefore, it was aimed in the present study to understand the evolution of texture and microstructure in directionally solidified Tb0.3Dy0.7Fe1.95 alloy by modified Bridgman and zone melting techniques. The alloy was directionally solidified by modified Bridgman technique with a series of growth rates 5 - 100 cm/h, at a constant temperature gradient of 150 °C/ cm. Microstructural investigation revealed formation of island banding at lower growth rate and peritectic coupled growth at higher growth rates. The texture study indicated a transition of growth texture from <113> to <110> and finally to <112> with increase of growth rate. A mechanism based on atomic attachment kinetics is proposed to explain the orientation selection with growth rate. The texture and microstructure have been correlated with magnetostriction and static strain co-efficient (dλ/dH) of the Bridgman solidified alloys. The solidification morphology observed in Bridgman solidified samples was found to be mostly plane front. Therefore, in order to understand the microstructure and texture evolution in cellular/ dendritic regime, directional solidification of Tb0.3Dy0.7Fe1.95 was attempted by zone melting technique with a lesser temperature gradient of 100 °C/cm. A detailed texture study indicated a transition in preferred growth direction from <110> to <112> with increase… Advisors/Committee Members: Chattopadhyay, K (advisor).

Subjects/Keywords: Terbium-Dysprosium-Iron Alloys; Iron-Gallium Alloys; Magnetosrestrictive Materials; (Tb,Dy)Fe2; Rare Earth Intermetallic Compounds; Galfenol; Tb-Dy-Fe Alloys; Fe-Ga Alloys; Magnetostriction; Magnetorestrictive Alloys; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Palit, M. (2016). An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2520

Chicago Manual of Style (16^th Edition):

Palit, Mithun. “An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys.” 2016. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2520.

MLA Handbook (7^th Edition):

Palit, Mithun. “An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys.” 2016. Web. 16 Jan 2021.

Vancouver:

Palit M. An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2016. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2520.

Council of Science Editors:

Palit M. An Investigation On The Effect Of Structural And Microstructural Attributes On Magnetostriction Of Tb-Dy-Fe And Fe-Ga Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2016. Available from: http://etd.iisc.ac.in/handle/2005/2520

6. Zollinger, Julien. Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides.

Degree: Docteur es, Science et ingénierie des matériaux, 2008, Lorraine INP

URL: http://www.theses.fr/2008INPL032N

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Cette étude s’inscrit dans le cadre du projet européen IMPRESS, "Intermetallic Materials Processing in Relation to Earth and Space Solidification". Elle porte sur la compréhension… (more)

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Cette étude s’inscrit dans le cadre du projet européen IMPRESS, "Intermetallic Materials Processing in Relation to Earth and Space Solidification". Elle porte sur la compréhension des mécanismes fondamentaux qui contrôlent la solidification de l’alliage Ti-46Al-8Nb envisagés pour le développement d’aubes de turbines. La première partie de cette étude caractérise l’influence de l’oxygène sur le comportement à la solidification d’alliages de base TiAl coulés et contenant de 40 a 48 at.% d’aluminium. L’addition d’oxygène augmente la fraction volumique de phase [alpha] formée pendant la solidification péritectique et conduit au changement de la phase primaire de solidification de la phase [bêta] à la phase [alpha] dans les alliages ternaires Ti-44,3Al-1,5O, Ti-47,7Al-0,8O et Ti-47,3Al-1,5O (at.%). Les coefficients de partage pour l’aluminium et l’oxygène kAl[alpha]/l= 0,9 et kO[alpha]/l = 1,29, ont été déterminés pour l’alliage ayant [alpha] comme phase primaire de solidification. Dans un deuxième temps, l’étude du comportement à la solidification de l’alliage Ti-46Al-8Nb, est décrite en portant une attention particulière sur les effets de la contamination et des conditions de croissance sur la formation des microstructures et des microségrégations. Deux comportements différents ont été mis en évidence : dans la phase primaire de solidification [alpha] rencontrée pour des hauts niveaux de contamination en oxygène, une très faible rétrodiffusion est observée. Pour de faibles quantités d’oxygène, la phase primaire de solidification est la phase [bêta]. Dans ce cas la présence d’oxygène induit une augmentation de l’amplitude de ségrégation malgré une forte rétrodiffusion dans la structure cubique centrée

This study was performed in the framework of the IMPRESS, "Intermetallic Materials Processing in Relation to Earth and Space Solidification", and is dedicated to the understanding of the fundamental mechanisms that control solidification in a Ti-46Al-8Nb alloy selected for TiAl-based alloy turbine blade development. The first part of this work is devoted to study the influence of oxygen on the solidification behaviour of cast TiAl-based alloys containing from 40 to 48 at.% of Al. Increasing the oxygen content affects significantly the macrostructure of the as-cast ingots, increases volume fraction of the phase formed during the peritectic solidification and leads to a change of the [bêta] primary solidification phase to the [alpha] phase in the ternary Ti-44.2Al-1.4O, Ti-47.3Al-0.9O and Ti-47.2Al-1.5O (at.%) alloys. When [alpha] is the primary solidification phase, the partition coefficients has been determined as kAl[alpha]/l= 0,9 and kO(alpha]/l = 1,29. In a second part, the solidification behaviour of Ti-46Al-8Nb alloy is investigated, with a particular attention to the contamination and growth conditions effects on microstructures and microsegregation formations. For high contamination levels, the solidification phase is [alpha] where oxygen reduces solute mobility, leading to limited backdiffusion. In low oxygen…

Advisors/Committee Members: Combeau, Hervé (thesis director), Daloz, Dominique (thesis director).

Subjects/Keywords: Solidification; Microstructures; Microségrégation; Alliages TiAl; Composés intermétalliques; Solidification; Microstructures; Microsegregation; TiAl-based alloys; Intermetallic compounds

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zollinger, J. (2008). Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides. (Doctoral Dissertation). Lorraine INP. Retrieved from http://www.theses.fr/2008INPL032N

Chicago Manual of Style (16^th Edition):

Zollinger, Julien. “Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides.” 2008. Doctoral Dissertation, Lorraine INP. Accessed January 16, 2021. http://www.theses.fr/2008INPL032N.

MLA Handbook (7^th Edition):

Zollinger, Julien. “Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides.” 2008. Web. 16 Jan 2021.

Vancouver:

Zollinger J. Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides. [Internet] [Doctoral dissertation]. Lorraine INP; 2008. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2008INPL032N.

Council of Science Editors:

Zollinger J. Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI : Influence of oxygen on the solidification behaviour of binary and niobium containing gamma titanium aluminides. [Doctoral Dissertation]. Lorraine INP; 2008. Available from: http://www.theses.fr/2008INPL032N

RMIT University

7. Todaro, C. Refinement of the microstructure of light alloys using ultrasonic and laser processing.

Degree: 2019, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:163016

► The transport sector represents 20 pct of all greenhouse gas emissions globally. The use of aluminum (Al) to reduce vehicle weight offers the potential to… (more)

Subjects/Keywords: Fields of Research; Al alloys; Intermetallic compounds; Ultrasound; Laser processing; Solidification processing

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APA (6^th Edition):

Todaro, C. (2019). Refinement of the microstructure of light alloys using ultrasonic and laser processing. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:163016

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Todaro, C. “Refinement of the microstructure of light alloys using ultrasonic and laser processing.” 2019. Thesis, RMIT University. Accessed January 16, 2021. http://researchbank.rmit.edu.au/view/rmit:163016.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Todaro, C. “Refinement of the microstructure of light alloys using ultrasonic and laser processing.” 2019. Web. 16 Jan 2021.

Vancouver:

Todaro C. Refinement of the microstructure of light alloys using ultrasonic and laser processing. [Internet] [Thesis]. RMIT University; 2019. [cited 2021 Jan 16]. Available from: http://researchbank.rmit.edu.au/view/rmit:163016.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Todaro C. Refinement of the microstructure of light alloys using ultrasonic and laser processing. [Thesis]. RMIT University; 2019. Available from: http://researchbank.rmit.edu.au/view/rmit:163016

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

8. Gunjal, Vilas Vishnu. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2965

► The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent… (more)

▼ The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent studies demonstrated attractive properties of eutectic intermetallic in the Ni-Al-Zr systems. This thesis deals with study of binary Ni3Al+Ni7Zr2, NiAl+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary intermetallic eutectic alloys in this system and includes the identification of compositions that would yield each eutectic structure and their microstructural characterization, mechanical and oxidation behavior. The thesis is divided into six chapters. Chapter 1 reviews the study on high temperature materials development and presents the objectives of work in the current thesis. Various experimental techniques used for alloy preparation (vacuum arc melting and vacuum suction casting), microstructural characterization (optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray Diffraction (XRD), electron probe micro analyzer (EPMA), differential scanning calorimetry (DSC)), compression tests, microhardness tests and thermo gravimetric analysis (TGA) are described in Chapter 2. The specific background of work related to each chapter together with experimental results and discussion are given in next three chapters. Chapter 3 reports the method of identification of the composition for each of the eutectic alloys referred to above. The identification of alloy compositions of binary eutectics Ni3Al+Ni7Zr2 (Ni-13.5Al-11Zr), NiAl+Ni7Zr2 (Ni-19Al-12Zr) and Ni3Al+NiAl+Ni7Zr2 ternary eutectic (Ni-18.4Al-11.6Zr) is carried out with the help of available liquidus projection of Ni-Al-Zr system, and the iterative melting of numerous compositions that were refined to define the critical compositions for each eutectic. The microstructural features of these alloys have been characterized using optical and electron microscopy. Phase identification is confirmed by X ray diffraction, EPMA and TEM. The microstructure of Ni3Al+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary eutectic alloy shows similar eutectic morphologies. The eutectic colony consists of lamellar plates at center and intermixed lamellar-rod irregular morphologies towards the boundaries of the colonies. However, the NiAl+Ni7Zr2 eutectic alloy shows a fine, lamellar plate morphology throughout the microstructure. The orientation relationship between eutectic phases is determined using TEM technique for each alloy composition. Onsets of melting and liquidus temperatures have been identified by Differential Scanning Calorimetry. Modified liquidus projections of Ni-Al-Zr system near the Ni3Al+NiAl+Ni7Zr2 ternary eutectic region have been derived from present experimental work. Chapter 4 focuses on understanding the mechanical behaviour of these individual eutectics at room temperature and high temperature. An attempt has been made to correlate the microstructure and mechanical properties of eutectics by measuring room temperature hardness, compressive yield strength… Advisors/Committee Members: Banerjee, D (advisor).

Subjects/Keywords: Intermetallic Eutectic Alloy; Nickel Aluminium Zirconium Alloys; Binary Eutectics; Ternary Eutectics; Eutectic Alloys; Eutectics; Ni3Al; Ni-Al-Zr Alloys; Ni7Zr2; Ni-Al-Zr System; Materials Engineering

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APA (6^th Edition):

Gunjal, V. V. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2965

Chicago Manual of Style (16^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2965.

MLA Handbook (7^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2965.

Council of Science Editors:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2965

NSYSU

9. Chuang, Chia-hao. none.

Degree: Master, Materials Science and Engineering, 2005, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721105-131223

► The friction stir processing is applied in mixing elemental thin sheets of Mg, Al, and Zn in various portions to result in hard intermetallic alloys… (more)

Subjects/Keywords: hardness; Friction stir processing; magnesium alloy; intermetallic alloys

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APA (6^th Edition):

Chuang, C. (2005). none. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721105-131223

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chuang, Chia-hao. “none.” 2005. Thesis, NSYSU. Accessed January 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721105-131223.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chuang, Chia-hao. “none.” 2005. Web. 16 Jan 2021.

Vancouver:

Chuang C. none. [Internet] [Thesis]. NSYSU; 2005. [cited 2021 Jan 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721105-131223.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chuang C. none. [Thesis]. NSYSU; 2005. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721105-131223

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Scholl, Milton R. Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys.

Degree: PhD, 1986, Oregon Health Sciences University

URL: doi:10.6083/M4765C7N ; http://digitalcommons.ohsu.edu/etd/91

Subjects/Keywords: Intermetallic compounds; Hard-facing alloys; Strategic materials

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APA (6^th Edition):

Scholl, M. R. (1986). Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys. (Doctoral Dissertation). Oregon Health Sciences University. Retrieved from doi:10.6083/M4765C7N ; http://digitalcommons.ohsu.edu/etd/91

Chicago Manual of Style (16^th Edition):

Scholl, Milton R. “Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys.” 1986. Doctoral Dissertation, Oregon Health Sciences University. Accessed January 16, 2021. doi:10.6083/M4765C7N ; http://digitalcommons.ohsu.edu/etd/91.

MLA Handbook (7^th Edition):

Scholl, Milton R. “Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys.” 1986. Web. 16 Jan 2021.

Vancouver:

Scholl MR. Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys. [Internet] [Doctoral dissertation]. Oregon Health Sciences University; 1986. [cited 2021 Jan 16]. Available from: doi:10.6083/M4765C7N ; http://digitalcommons.ohsu.edu/etd/91.

Council of Science Editors:

Scholl MR. Development of intermetallic-hardened abrasion-resistant weld hardfacing alloys. [Doctoral Dissertation]. Oregon Health Sciences University; 1986. Available from: doi:10.6083/M4765C7N ; http://digitalcommons.ohsu.edu/etd/91

University of South Australia

11. Tayibnapis, Achmad Sjaifudin. Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites.

Degree: MEng, 1996, University of South Australia

URL: http://arrow.unisa.edu.au:8081/1959.8/84470 ; http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:43119

Subjects/Keywords: Intermetallic compounds.; Metallic composites.; Nickel-aluminum alloys.

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APA (6^th Edition):

Tayibnapis, A. S. (1996). Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites. (Thesis). University of South Australia. Retrieved from http://arrow.unisa.edu.au:8081/1959.8/84470 ; http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:43119

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tayibnapis, Achmad Sjaifudin. “Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites.” 1996. Thesis, University of South Australia. Accessed January 16, 2021. http://arrow.unisa.edu.au:8081/1959.8/84470 ; http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:43119.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tayibnapis, Achmad Sjaifudin. “Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites.” 1996. Web. 16 Jan 2021.

Vancouver:

Tayibnapis AS. Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites. [Internet] [Thesis]. University of South Australia; 1996. [cited 2021 Jan 16]. Available from: http://arrow.unisa.edu.au:8081/1959.8/84470 ; http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:43119.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tayibnapis AS. Studies of Al-Ni alloys as a potential matrix for particulate-reinforced metal matrix composites. [Thesis]. University of South Australia; 1996. Available from: http://arrow.unisa.edu.au:8081/1959.8/84470 ; http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:43119

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley

12. Lemberg, Joseph Aaron. Fracture Behavior of Advanced Structural Materials.

Degree: Materials Science & Engineering, 2011, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/749008vv

► Further development of ultra-high structural applications requires new materials that can withstand the extreme environments found in power-generation turbines. Highly refractory materials capable of high… (more)

Subjects/Keywords: Materials Science; Engineering; Alumina; Fracture; Functionally Graded Materials; Intermetallic Alloys; Mechanical Properties at Elevated Temperatures; Structural Materials

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APA (6^th Edition):

Lemberg, J. A. (2011). Fracture Behavior of Advanced Structural Materials. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/749008vv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lemberg, Joseph Aaron. “Fracture Behavior of Advanced Structural Materials.” 2011. Thesis, University of California – Berkeley. Accessed January 16, 2021. http://www.escholarship.org/uc/item/749008vv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lemberg, Joseph Aaron. “Fracture Behavior of Advanced Structural Materials.” 2011. Web. 16 Jan 2021.

Vancouver:

Lemberg JA. Fracture Behavior of Advanced Structural Materials. [Internet] [Thesis]. University of California – Berkeley; 2011. [cited 2021 Jan 16]. Available from: http://www.escholarship.org/uc/item/749008vv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lemberg JA. Fracture Behavior of Advanced Structural Materials. [Thesis]. University of California – Berkeley; 2011. Available from: http://www.escholarship.org/uc/item/749008vv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Hong Kong

13. Afrin, Nasima. An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns.

Degree: 2006, University of Hong Kong

URL: http://hdl.handle.net/10722/51912

Subjects/Keywords: Nanotechnology.; Nickel-aluminum alloys - Creep.; Intermetallic compounds - Creep.; Microstructure.

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APA (6^th Edition):

Afrin, N. (2006). An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/51912

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Afrin, Nasima. “An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns.” 2006. Thesis, University of Hong Kong. Accessed January 16, 2021. http://hdl.handle.net/10722/51912.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Afrin, Nasima. “An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns.” 2006. Web. 16 Jan 2021.

Vancouver:

Afrin N. An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns. [Internet] [Thesis]. University of Hong Kong; 2006. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10722/51912.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Afrin N. An investigation of deformation behaviour and creep properties of micron sized Ni3Al columns. [Thesis]. University of Hong Kong; 2006. Available from: http://hdl.handle.net/10722/51912

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

McMaster University

14. Gorny, Anton. Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys.

Degree: PhD, 2012, McMaster University

URL: http://hdl.handle.net/11375/12570

►

Al-Si cast alloys have been in the fore-front of commercial casting application for more than a century. Iron containing intermetallic phases that evolve during… (more)

Subjects/Keywords: Al-Si-Fe alloy; Sr modification; cast alloys; liquid structure; Al9Fe2Si2 and Al8Fe2Si intermetallic phases; phase evolution; Metallurgy; Metallurgy

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APA (6^th Edition):

Gorny, A. (2012). Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/12570

Chicago Manual of Style (16^th Edition):

Gorny, Anton. “Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys.” 2012. Doctoral Dissertation, McMaster University. Accessed January 16, 2021. http://hdl.handle.net/11375/12570.

MLA Handbook (7^th Edition):

Gorny, Anton. “Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys.” 2012. Web. 16 Jan 2021.

Vancouver:

Gorny A. Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys. [Internet] [Doctoral dissertation]. McMaster University; 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11375/12570.

Council of Science Editors:

Gorny A. Characterization of Major Intermetallic Phases in solidified Al-xSi-yFe-zSr (x=2 to 12.5 wt%, y=0 to 0.5 wt% and z=0 and 0.02 wt%) alloys. [Doctoral Dissertation]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12570

15. Ponthieu, Marine. Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites.

Degree: Docteur es, Chimie, 2013, Université Paris-Est

URL: http://www.theses.fr/2013PEST1139

►

Cette thèse est consacrée à l'étude de composés riches en magnésium innovants destinés au stockage solide de l'hydrogène. Le but est de déstabiliser l'hydrure de… (more)

▼

Cette thèse est consacrée à l'étude de composés riches en magnésium innovants destinés au stockage solide de l'hydrogène. Le but est de déstabiliser l'hydrure de Mg et d'accélérer sa cinétique de sorption par des effets d'alliage et de nano-structuration. La première famille de composés concerne les phases pseudo-binaires Mg6Pd1-xMTx (MT = Ni, Ag, Cu). Leurs propriétés structurales et les effets de substitution du Pd ont été étudiés par diffraction des rayons X, microscopie électronique à balayage et microsonde de Castaing. Les propriétés thermodynamiques et cinétiques d'hydrogénation de ces matériaux ont ensuite été déterminées par réaction solide-gaz. Différents mécanismes d'hydrogénation sont mis en jeu en fonction de l'élément de substitution. La nature des phases formées lors de la réaction d'hydrogénation modifie la stabilité des systèmes métal-hydrogène. Ainsi, la transformation de métal à hydrure est caractérisée par au moins deux plateaux de pression. Le premier plateau a lieu à une pression proche de celle de Mg/MgH2, alors que le second se produit à pression plus élevée. La détermination des valeurs d'enthalpie et d'entropie de réaction ont permis de quantifier la déstabilisation atteinte. Les meilleures cinétiques de désorption sont obtenues pour l'alliage au Ni, grâce à l'effet catalytique de la phase Mg2NiH4 formée lors de l'hydrogénation. La seconde approche vise à combiner les effets d'alliage et de nano-structuration. Des nanoparticules de Mg6Pd atteignant des tailles aussi petites que 3 nm sont confinées dans des matrices carbonées nano-poreuses. En comparant leurs propriétés d'hydrogénation à celles de l'alliage massif équivalent, on démontre non seulement que la cinétique de (dés)hydrogénation des nanoparticules est bien plus rapide, mais aussi que leur état hydrogéné est déstabilisé. Enfin, des nano-composites MgH2-TiH2 ont été synthétisés par broyage mécanique sous atmosphère réactive. L'ajout d'un catalyseur (TiH2) et la nano-structuration du Mg permettent de considérablement accélérer les cinétiques d'absorption et désorption d'hydrogène dans le Mg. Afin de comprendre le rôle de la phase TiH2 sur les propriétés cinétiques remarquables de ces nano-composites, leurs propriétés structurales ont été déterminées par diffraction des rayons X et des neutrons. L'existence d'une interface cohérente entre les phases Mg et TiH2 est d'importance majeure pour faciliter la mobilité de H au sein du nano-composite. De plus, il est démontré que les inclusions de TiH2 freinent la croissance de grain de Mg/MgH2, permettant ainsi de maintenir la nano-structuration des composés lors de leur cyclage

This thesis is dedicated to the study of novel magnesium-rich compounds for solid state hydrogen storage. The aim is to destabilize Mg hydride and accelerate its sorption kinetics by alloying and nanostructuration. The first family of compounds concerns the Mg6Pd1-xTMx (TM = Ni, Ag, Cu) pseudo-binary phases. Their structural properties and the effects of Pd substitution have been studied by X-ray diffraction,…

Advisors/Committee Members: Cuevas, Fermín (thesis director).

Subjects/Keywords: Hydrures métalliques; Stockage d'hydrogène; Magnésium; Alliages intermétalliques; Nanomatériaux; Metal hydrides; Hydrogen storage; Magnesium; Intermetallic alloys; Nanomaterials

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APA (6^th Edition):

Ponthieu, M. (2013). Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2013PEST1139

Chicago Manual of Style (16^th Edition):

Ponthieu, Marine. “Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites.” 2013. Doctoral Dissertation, Université Paris-Est. Accessed January 16, 2021. http://www.theses.fr/2013PEST1139.

MLA Handbook (7^th Edition):

Ponthieu, Marine. “Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites.” 2013. Web. 16 Jan 2021.

Vancouver:

Ponthieu M. Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites. [Internet] [Doctoral dissertation]. Université Paris-Est; 2013. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2013PEST1139.

Council of Science Editors:

Ponthieu M. Nouveaux matériaux riches en Mg pour le stockage d’hydrogène : composés Mg6Pd1-xMTx (MT = Ni, Ag, Cu) massifs et nanoconfinés et nanocomposites MgH2-TiH2 : Novel Mg-rich materials for hydrogen storage : bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 nanocomposites. [Doctoral Dissertation]. Université Paris-Est; 2013. Available from: http://www.theses.fr/2013PEST1139

Université de Lorraine

16. Tardelli, Joffrey. Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials.

Degree: Docteur es, Chimie, 2012, Université de Lorraine

URL: http://www.theses.fr/2012LORR0082

►

L'étude du comportement électrochimique des phases intermétalliques Al2Cu, Al2CuMg, Al7Cu2Fe, (Al,Cu)16Mn4Si3 et MgZn2, caractéristiques des alliages d'aluminium 2214-T6 et 7050-T74 et réalisée à partir d'échantillons… (more)

▼

L'étude du comportement électrochimique des phases intermétalliques Al2Cu, Al2CuMg, Al7Cu2Fe, (Al,Cu)16Mn4Si3 et MgZn2, caractéristiques des alliages d'aluminium 2214-T6 et 7050-T74 et réalisée à partir d'échantillons massifs synthétisés, a montré que la formation de défauts majeurs dans la couche d'oxyde, obtenue par anodisation des alliages en milieu H2SO4 200 g/l, était directement due à la présence de ces particules au sein des alliages. L'important dégagement gazeux d'oxygène qui se produit à la surface de ces particules lors de l'étape d'anodisation explique la formation de trous et de fractures dans la couche d'oxyde. En milieu marin, ces défauts facilitent la migration des ions chlorures à la surface de l'alliage mise à nu localement et favorisent par conséquent le développement de la corrosion localisée. Les résultats obtenus en milieu NaCl 35g/l ont permis de mieux comprendre le mécanisme de corrosion des phases intermétalliques ainsi que leur rôle sur la propagation des piqûres. L'élimination des particules intermétalliques de la surface des alliages lors de l'étape de décapage (avant anodisation) permet de favoriser une croissance plus régulière de la couche d'oxyde lors de l'anodisation. Par conséquent, la résistance à la corrosion des alliages 2214 et 7050 augmente considérablement, permettant d'atteindre les objectifs fixés lors de ce projet

The electrochemical behaviour of the bulk intermetallic particles such as Al2Cu, Al2CuMg, Al7Cu2Fe, (Al,Cu)16(Mn,Fe)4Si3 and MgZn2 showed that the formation of wide defects in the oxide layer during the 2214-T6 and 7050-T74 alloys anodization was directly due to the presence of these kind of particles in the microstructure which are able to sustain both high dissolution rate and high water oxidation kinetics in acidic electrolyte. In marine environment, these defects facilitate the migration of aggressive ions like chloride on the locally bare alloys and are the onset of the pitting corrosion. The results obtained in 3.5 wt.% sodium chloride electrolyte permit to understand the corrosion mechanism of the intermetallic phases and their influence on the pits propagation. The optimization of the alloys pickling conditions in order to remove this kind of particles (prior to the anodization step) has been investigated in this work. Consequence of removing intermetallic particles, the aluminium enrichment of the surface facilitates the oxide growth and the formation of regular layer. The corrosion tests on treated aluminium alloys have clearly showed the influence of the pickling step on the resistance corrosion of 2214 and 7050 alloys, reaching the objectives fixed in this project

Advisors/Committee Members: Rocca, Emmanuel (thesis director).

Subjects/Keywords: Alliages d'aluminium; Phases intermétalliques; Corrosion; Décapage; Anodisation; Aluminium alloys; Intermetallic phases; Localized corrosion; Pickling; Anodization; 620.112 23

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APA (6^th Edition):

Tardelli, J. (2012). Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2012LORR0082

Chicago Manual of Style (16^th Edition):

Tardelli, Joffrey. “Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials.” 2012. Doctoral Dissertation, Université de Lorraine. Accessed January 16, 2021. http://www.theses.fr/2012LORR0082.

MLA Handbook (7^th Edition):

Tardelli, Joffrey. “Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials.” 2012. Web. 16 Jan 2021.

Vancouver:

Tardelli J. Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials. [Internet] [Doctoral dissertation]. Université de Lorraine; 2012. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2012LORR0082.

Council of Science Editors:

Tardelli J. Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74 : approche multi-échelle de matériaux polyphasés : Electrochemical behaviour of main intermetallic phases of 2214-T6 and 7050-T74 aluminium alloys : multi-scale approach of polyphased materials. [Doctoral Dissertation]. Université de Lorraine; 2012. Available from: http://www.theses.fr/2012LORR0082

17. Szakács, Gábor. Secondary phase selection during solidification of Mg-Y-Gd alloys.

Degree: 2019, Technische Universität Dortmund

URL: https://doi.org/10.21268/20191008-0 ; https://nbn-resolving.org/urn:nbn:de:gbv:104-20191008-00000-4 ; https://dokumente.ub.tu-clausthal.de/receive/clausthal_mods_00001029 ; https://dokumente.ub.tu-clausthal.de/servlets/MCRFileNodeServlet/clausthal_derivate_00000773/Db114134.pdf

►

Mg-RE alloys have been already of interest as lightweight, high temperature creep resistant structural materials for transportation, but they have become even more attractive for… (more)

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Mg-RE alloys have been already of interest as lightweight, high temperature creep resistant structural materials for transportation, but they have become even more attractive for bio-medical application during the last decades. Mg-Y-Gd alloys could be suitable candidates for both applications, but the microstructure evolution of this system has not been investigated to understand the types of intermetallic phases present during solidification. Although it has been reported earlier that in dilute ternary alloys Mg24(Y,Gd)5 phase was prevalent, but due to the low concentration of Y and Gd it was difficult to follow the microstructure evolution during solidification nor was it possible to conclusively show the formation of various intermetallic phases. Therefore, alloys, which are more concentrated, are utilized in this study to understand the phase evolution during solidification. In order to evaluate the effect of Gd content in Mg-(15-x)YxGd alloys were investigated (x=0, 5, 7.5, 10, 15). Besides microstructure investigation (LOM, SEM, TEM), in situ experiments during solidification were performed on the chosen alloys with synchrotron radiation diffraction and DSC. The experiment results are correlated with thermodynamic calculations using Pandat software. The binary magnesium-gadolinium specimens with in situ synchrotron radiation diffraction show the formation of a metastable phase (with a structure of Mg3Gd phase) at eutectic temperature from the liquid and then it transforms to the expected (both from calculation and available literature) equilibrium state stable Mg5Gd regardless from the applied cooling rates. The experimental results of the binary W15 alloy consistently produces a narrower solidification range and higher eutectic temperature of the system than it is expected from the determined results from calculations. The Gd addition into the Mg-Y-Gd ternary alloys did not change the route of the solidification paths in neither applied cooling rates, and only one intermetallic phase (structure of R5Mg24 phase) formation can be observed.

Mg-RE Legierungen waren bereits als leichte, hochtemperaturbeständige Konstruktionswerkstoffe für den Transport von Interesse, sind aber in den letzten Jahren für die biomedizinische Anwendung noch attraktiver geworden. Mg-Y-Gd-Legierungen könnten für beide Anwendungen geeignete Kandidaten sein, aber die Gefügeentwicklung dieses Systems wurde noch nicht daraufhin untersucht, die Arten von intermetallischen Phasen während der Erstarrung zu identifizieren. Obwohl früher berichtet wurde, dass in verdünnten ternären Legierungen die Phase Mg24(Y,Gd)5 auftrat, war es aufgrund der geringen Konzentration von Y und Gd schwierig, die Entwicklung der Mikrostruktur während der Erstarrung zu verfolgen. Jedoch war es möglich, die Bildung verschiedener intermetallischer Phasen endgültig nachzuweisen. Daher werden in dieser Studie Legierungen mit höherem Seltenerd-Gehalt untersucht, um die Phasenentwicklung während der Erstarrung zu verstehen. Um die Wirkung des Gd-Gehalts in…

Advisors/Committee Members: Schmid-Fetzer, Rainer.

Subjects/Keywords: Abschlussarbeit; doctoral thesis; ddc:620.1; Mg-RE alloys – solidification – intermetallic phase – Mg-RE Legierungen – Erstarrung – intermetallische Phase

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Szakács, G. (2019). Secondary phase selection during solidification of Mg-Y-Gd alloys. (Thesis). Technische Universität Dortmund. Retrieved from https://doi.org/10.21268/20191008-0 ; https://nbn-resolving.org/urn:nbn:de:gbv:104-20191008-00000-4 ; https://dokumente.ub.tu-clausthal.de/receive/clausthal_mods_00001029 ; https://dokumente.ub.tu-clausthal.de/servlets/MCRFileNodeServlet/clausthal_derivate_00000773/Db114134.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Szakács, Gábor. “Secondary phase selection during solidification of Mg-Y-Gd alloys.” 2019. Thesis, Technische Universität Dortmund. Accessed January 16, 2021. https://doi.org/10.21268/20191008-0 ; https://nbn-resolving.org/urn:nbn:de:gbv:104-20191008-00000-4 ; https://dokumente.ub.tu-clausthal.de/receive/clausthal_mods_00001029 ; https://dokumente.ub.tu-clausthal.de/servlets/MCRFileNodeServlet/clausthal_derivate_00000773/Db114134.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Szakács, Gábor. “Secondary phase selection during solidification of Mg-Y-Gd alloys.” 2019. Web. 16 Jan 2021.

Vancouver:

Szakács G. Secondary phase selection during solidification of Mg-Y-Gd alloys. [Internet] [Thesis]. Technische Universität Dortmund; 2019. [cited 2021 Jan 16]. Available from: https://doi.org/10.21268/20191008-0 ; https://nbn-resolving.org/urn:nbn:de:gbv:104-20191008-00000-4 ; https://dokumente.ub.tu-clausthal.de/receive/clausthal_mods_00001029 ; https://dokumente.ub.tu-clausthal.de/servlets/MCRFileNodeServlet/clausthal_derivate_00000773/Db114134.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Szakács G. Secondary phase selection during solidification of Mg-Y-Gd alloys. [Thesis]. Technische Universität Dortmund; 2019. Available from: https://doi.org/10.21268/20191008-0 ; https://nbn-resolving.org/urn:nbn:de:gbv:104-20191008-00000-4 ; https://dokumente.ub.tu-clausthal.de/receive/clausthal_mods_00001029 ; https://dokumente.ub.tu-clausthal.de/servlets/MCRFileNodeServlet/clausthal_derivate_00000773/Db114134.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Jönköping University

18. Gondhalekar, Akash Avinash. Design and Development of Light Weight High Entropy Alloys.

Degree: Materials and Manufacturing, 2019, Jönköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45551

► The main aim of this thesis was to design and develop new Aluminium based compositionally complex alloys (CCAs) using the high entropy alloy (HEA)… (more)

▼ The main aim of this thesis was to design and develop new Aluminium based compositionally complex alloys (CCAs) using the high entropy alloy (HEA) concept, and to understand their evolution of microstructures during casting and also after the secondary process which is heat-treatment, and finally to evaluate their subsequent mechanical properties. Prior to the development of alloys, a computational technique ThermoCalc was used which helped in understanding the phase formation in various results. Use of thermodynamic physical parameters for predicting the stability of single-phase fields was done to assess their validity in predicting the compositional regions of the alloys developed. The first alloy developed is Al73.6Mg18Ni1.5Ti1.9Zr1Zn4 in at% (NiTiZrZn) CCA. The microstructure consists of the FCC as a primary phase with ~49% volume fraction along with β-AlMg and intermetallic (IM) phases including Al3Ni, Al3Ti, and Al3Zr. After casting, the microstructure showed some presence of eutectic structures. The Al3Ti, and Al3Zr IM phases seemed to precipitate early which led to less homogenization of Ti and Zr, causing deviation in the amount of these elements in the matrix. Further, the CCA was heat-treated at 375 oC for 24hrs and 48hrs and the evolution of microstructure along with its hardness and phase transformation characterisation was investigated. The second developed alloy was quaternary Al65.65Mg21.39Ag10.02Ni2.94 in at% (AgNi) CCA. In the as-cast state, the main phase (matrix) was FCC with ~64 % volume fraction along with BCC, β-AlMg and Al3Ni IM phases. There was a good level homogenization of all elements in the alloy. They were further heat- treated at 400 oC for 24 hrs and 48 hrs and were studied for any change in microstructure along with its hardness and thermal stability. This CCA had the highest hardness value from all developed CCAs. Lastly, in order to check how Ni affects the microstructure and properties of (AgNi) CCA, a ternary Al67.2Mg22.09Ag10.7 in at% (Ag) CCA was developed. The composition was kept such that it is exactly 97% by excluding the Ni. During the development of this alloy, the cast was cooled in two ways first being the normal cooled just like other CCAs and second being a fast cooling method. Both of these alloys consists of the FCC phase as a primary phase with 72% volume fraction along with BCC and β-AlMg. Both of them were also heat treated at 400 oC for 24 hrs and 48 hrs to evaluate any changes in microstructure and also to assess its hardness and thermal stability.

Subjects/Keywords: High Entropy Alloys; CCAs; Solid Solutions; Intermetallic Compounds; Thermodynamic; Multicomponent; Microstructure; Mechanical Properties; Metallurgy and Metallic Materials; Metallurgi och metalliska material

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gondhalekar, A. A. (2019). Design and Development of Light Weight High Entropy Alloys. (Thesis). Jönköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gondhalekar, Akash Avinash. “Design and Development of Light Weight High Entropy Alloys.” 2019. Thesis, Jönköping University. Accessed January 16, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gondhalekar, Akash Avinash. “Design and Development of Light Weight High Entropy Alloys.” 2019. Web. 16 Jan 2021.

Vancouver:

Gondhalekar AA. Design and Development of Light Weight High Entropy Alloys. [Internet] [Thesis]. Jönköping University; 2019. [cited 2021 Jan 16]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gondhalekar AA. Design and Development of Light Weight High Entropy Alloys. [Thesis]. Jönköping University; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

19. Sharrott, Doug. High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys.

Degree: MS, Dept. of Material Science and Mechanics, 1995, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:25493

Subjects/Keywords: Iron-aluminum alloys; Intermetallic compounds; Deformations (Mechanics); Electron microscopy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sharrott, D. (1995). High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:25493

Chicago Manual of Style (16^th Edition):

Sharrott, Doug. “High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys.” 1995. Masters Thesis, Michigan State University. Accessed January 16, 2021. http://etd.lib.msu.edu/islandora/object/etd:25493.

MLA Handbook (7^th Edition):

Sharrott, Doug. “High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys.” 1995. Web. 16 Jan 2021.

Vancouver:

Sharrott D. High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys. [Internet] [Masters thesis]. Michigan State University; 1995. [cited 2021 Jan 16]. Available from: http://etd.lib.msu.edu/islandora/object/etd:25493.

Council of Science Editors:

Sharrott D. High resolution electron microscopy examination of dislocation core structures in B2 Fe-A1 alloys. [Masters Thesis]. Michigan State University; 1995. Available from: http://etd.lib.msu.edu/islandora/object/etd:25493

Montana State University

20. Mirpuri, Rajesh G. Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy.

Degree: MS, College of Engineering, 1991, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/6971

Subjects/Keywords: Zirconium alloys.; Zirconium.; Oxidation.; Intermetallic compounds.; Electron spectroscopy.

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APA (6^th Edition):

Mirpuri, R. G. (1991). Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/6971

Chicago Manual of Style (16^th Edition):

Mirpuri, Rajesh G. “Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy.” 1991. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/6971.

MLA Handbook (7^th Edition):

Mirpuri, Rajesh G. “Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy.” 1991. Web. 16 Jan 2021.

Vancouver:

Mirpuri RG. Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy. [Internet] [Masters thesis]. Montana State University; 1991. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6971.

Council of Science Editors:

Mirpuri RG. Analysis and characterization of surface oxides on intermetallic alloys of zirconium using auger electron spectroscopy. [Masters Thesis]. Montana State University; 1991. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6971

21. Sirindil, Abdullah. Z-modules et alliages intermétalliques : Z-module in intermetallic alloys.

Degree: Docteur es, Science des Matériaux, 2017, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2017PA066484

►

Le présent travail de thèse se propose de profiter de la description cristallographique à N dimensions pour rediscuter les structures des alliages métalliques périodiques dont… (more)

▼

Le présent travail de thèse se propose de profiter de la description cristallographique à N dimensions pour rediscuter les structures des alliages métalliques périodiques dont les atomes sont situés sur un sous-ensemble ordonné d’un Z-module — c’est-à-dire sur des positions qui sont des combinaisons linéaires entières de N>3 vecteurs arithmétiquement indépendants— exemplifiés par les quasicristaux et les phases approximantes. La description cristallographique à N dimensions permet ainsi de révéler des symétries supplémentaires, cachées dans l’espace physique, susceptibles d’engendrer de nouveaux types de défauts, dits défauts de module, dans les alliages métalliques périodiques dont les atomes se localisent sur un Z-module non trivial dans l’espace direct. Ces défauts correspondent aux opérations de symétrie interne du Z-module qui sont perdues lors de la projection rationnelle dans l’espace physique en raison de la périodicité de l’alliage. Ce sont des macles, des défauts de translations et les dislocations qui les bordent et que nous désignons par dislocations de modules pour les différencier des usuelles dislocations de réseau. Elles apparaissent comme des dislocations partielles bordant une ou plusieurs fautes d’empilement. Des dislocations particulières peuvent exister avec des vecteurs de Burgers ayant une composante nulle dans l’espace physique. Ces dislocations, que nous appelons dislocations scalaires, n’engendrent aucun champ de contrainte et ne sont sensibles à aucun champ de déformation. La phase orthorhombique NiZr de symétrie Cmcm a une maille cristalline dont tous les atomes sont situés sur une fraction d’un même Z-module pentagonal ; elle, est à ce titre, parfaitement descriptible à 5 dimensions. A parti de cette analyse, nous avons prédit l’existence de nouveaux défauts tels que les macles quinaires et défauts de translations, tous observés et confirmés par nos observations en microscopie électronique haute résolution HREM et STEM-HAADF.

The present work is an attempt to take advantage of the N-dimensional crystallographic description to rediscuss the structures of periodic metal alloys whose atoms are located on an ordered subset of a Z-module — positions that are integer linear combinations of N> 3 arithmetically independent vectors — like those encountered in quasicrystals and approximants. This N-dimensional crystallographic description makes it possible to reveal hidden symmetries in periodic metallic alloys, that can generate new types of possible defects by symmetry breaking during the projection in the physical space. Thus, in addition to the usual defects due to a local breaking of periodicity, these alloys may contain new defects corresponding to internal symmetry operations of the Z-module which are lost due to the periodicity of the alloy. These defects are twins, translation defects and dislocations that border them and that we refer to as dislocations of modules to differentiate them from the usual network dislocations and which appear as partial dislocations bordering one or more…

Advisors/Committee Members: Vermaut, Philippe (thesis director).

Subjects/Keywords: Z-Module; Alliage intermétallique; Approximant; Macle quinaire; Dislocation de module; Dislocation scalaire; Z-Module; Intermetallic alloys; Scalar dislocation; 546.3

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APA (6^th Edition):

Sirindil, A. (2017). Z-modules et alliages intermétalliques : Z-module in intermetallic alloys. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2017PA066484

Chicago Manual of Style (16^th Edition):

Sirindil, Abdullah. “Z-modules et alliages intermétalliques : Z-module in intermetallic alloys.” 2017. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed January 16, 2021. http://www.theses.fr/2017PA066484.

MLA Handbook (7^th Edition):

Sirindil, Abdullah. “Z-modules et alliages intermétalliques : Z-module in intermetallic alloys.” 2017. Web. 16 Jan 2021.

Vancouver:

Sirindil A. Z-modules et alliages intermétalliques : Z-module in intermetallic alloys. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2017. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2017PA066484.

Council of Science Editors:

Sirindil A. Z-modules et alliages intermétalliques : Z-module in intermetallic alloys. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2017. Available from: http://www.theses.fr/2017PA066484

22. Kumar, Anupam. Metal Hydride Heat Pumps for Thermal Management of Devices.

Degree: 2013, University of Nevada – Reno

URL: http://hdl.handle.net/11714/3224

► Metal hydrides have very high volumetric energy densities which makes metal hydride heat pumps (MHHPs) particularly efficient devices. Further, a metal hydride heat pump (MHHP)… (more)

▼ Metal hydrides have very high volumetric energy densities which makes metal hydride heat pumps (MHHPs) particularly efficient devices. Further, a metal hydride heat pump (MHHP) can be tuned to cover a wide range of temperatures. Most phase change materials (PCMs) have a fixed phase change temperature, but metal hydrides are more versatile since they undergo phase change at all temperatures by adjusting the hydrogen equilibrium pressure. Currently, there is knowledge of heat pumps of large sizes, but we do not have data for small/miniature heat pump devices for either heating or cooling. The motivation for this work was to develop MHHPs for small scale applications. In the present work, experimental studies have been carried out on heat pumps working with different hydride pairs, such as MmNi4.15Fe0.85/LaNi4.6Sn0.4, MmNi4.15Fe0.85/LaNi4.78Sn0.22, and LaNi4.78Sn0.22/LaNi4.6Sn0.4, where Mm represents Mischmetal. The issues addressed in this work are miniaturization of a MHHP, electronic control of heat pump hydrogen gas transfer, heat pump performance and its dependence on gas pressure ratio in a MHHP, and mitigation of parasitic losses by reducing the amount of excess H2 in the system. The electronic control of MHHP was accomplished by using a proton exchange membrane (PEM) with catalyst, thus replacing the mechanical valve which separates the two hydrides in a conventional heat pump. Such a heat pump can be recharged just with the reversal of polarity of the applied voltage to the PEM thereby obviating the need to heat the low pressure side of a metal hydride heat pump for system recharge. In a typical MHHP, the equilibrium plateau pressures of the hydrides (in two different cylinders) are used to control the non-equilibrium thermodynamics. Minimum temperatures in the range of +16<super>o<super>C to -12<super>o<super>C were obtained by varying the equilibrium pressure ratios (P1/P2) of the two hydrides from 0.006 to 150 respectively. It was found that the minimum temperature or the degree of cooling is logarithmically dependent on the pressure ratio. The minimum pressure ratio for optimum functioning of the heat pump was found to be P1/P2 = 0.2. Also, the presence of excess H2 is detrimental to heat pump performance, for example, reducing the excess amount of H2 gas in the system from ~2.25 moles to ~0 moles led to the reduction of minimum temperature from 20.5<super>o<super>C to 7<super>o<super>C. A minimum temperature of 7<super>o<super>C was obtained with the heat pump (LaNi4.78Sn0.22/LaNi4.6Sn0.4) in the absence of an external heat load (and under thermal insulation). Experiments conducted on the same system with an external heat load (and without thermal insulation) showed a drop in temperature of the heat load from ~79<super>o<super>C to ~46<super>o<super>C by the metal hydride, a reduction by… Advisors/Committee Members: Chandra, Dhanesh (advisor), Fuchs, Alan (committee member), Chidambaram, Dev (committee member), Chien, Wen-Ming (committee member), Daemen, Jaak J.K. (committee member).

Subjects/Keywords: Equilibrium Plateau Pressure; Hydrogen; Intermetallic Alloys; Metal Hydride Heat Pump (MHHP); Proton Exchange Membrane (PEM); Thermal Management Devices

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APA (6^th Edition):

Kumar, A. (2013). Metal Hydride Heat Pumps for Thermal Management of Devices. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/3224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kumar, Anupam. “Metal Hydride Heat Pumps for Thermal Management of Devices.” 2013. Thesis, University of Nevada – Reno. Accessed January 16, 2021. http://hdl.handle.net/11714/3224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kumar, Anupam. “Metal Hydride Heat Pumps for Thermal Management of Devices.” 2013. Web. 16 Jan 2021.

Vancouver:

Kumar A. Metal Hydride Heat Pumps for Thermal Management of Devices. [Internet] [Thesis]. University of Nevada – Reno; 2013. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11714/3224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kumar A. Metal Hydride Heat Pumps for Thermal Management of Devices. [Thesis]. University of Nevada – Reno; 2013. Available from: http://hdl.handle.net/11714/3224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

23. Král, Michael. Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/66684

► Titanium and aluminium alloys are among the most used construct materials due to their physical and mechanical properties except steels. The joining of these alloys… (more)

Subjects/Keywords: svařování elektronovým svazkem; slitiny titanu; slitiny hliníku; intermetalické fáze; pájené spoje; electron beam welding; titanium alloys; aluminum alloys; intermetallic phases; brazed joins

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APA (6^th Edition):

Král, M. (2019). Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Král, Michael. “Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology.” 2019. Thesis, Brno University of Technology. Accessed January 16, 2021. http://hdl.handle.net/11012/66684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Král, Michael. “Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology.” 2019. Web. 16 Jan 2021.

Vancouver:

Král M. Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11012/66684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Král M. Struktura a vlastnosti svarového spoje TiAl6V4/6061 zhotoveného technologií elektronového paprsku: Structure and properties of welded joint TiAl6V4 / 6061 made by electron beam technology. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/66684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

24. Havlík, Petr. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/195565

► The problematics of weldability of heterogeneous welds of aluminium and titanium alloys produced by electron beam welding is discussed in this work. Homogenous welds of… (more)

Subjects/Keywords: heterogenní svarové spoje; hliníkové slitiny; titanové slitiny; svařování elektronovým svazkem; procesní parametry; intermetalické fáze; dissimilar welds; aluminium alloys; titanium alloys; electron beam welding; process parameters; intermetallic phases

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Havlík, P. (2020). Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/195565

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Havlík, Petr. “Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.” 2020. Thesis, Brno University of Technology. Accessed January 16, 2021. http://hdl.handle.net/11012/195565.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Havlík, Petr. “Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.” 2020. Web. 16 Jan 2021.

Vancouver:

Havlík P. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11012/195565.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Havlík P. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/195565

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Havlík, Petr. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/188120

► The problematics of weldability of heterogeneous welds of aluminium and titanium alloys produced by electron beam welding is discussed in this work. Homogenous welds of… (more)

Subjects/Keywords: heterogenní svarové spoje; hliníkové slitiny; titanové slitiny; svařování elektronovým svazkem; procesní parametry; intermetalické fáze; dissimilar welds; aluminium alloys; titanium alloys; electron beam welding; process parameters; intermetallic phases

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Havlík, P. (2020). Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/188120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Havlík, Petr. “Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.” 2020. Thesis, Brno University of Technology. Accessed January 16, 2021. http://hdl.handle.net/11012/188120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Havlík, Petr. “Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS.” 2020. Web. 16 Jan 2021.

Vancouver:

Havlík P. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11012/188120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Havlík P. Svařování heterogenních svarových spojů Ti/Al slitin pomocí elektronového svazku: ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/188120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

INP Toulouse

26. Radutoiu, Nicoleta. Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy.

Degree: Docteur es, Science et Génie des Matériaux, 2013, INP Toulouse

URL: http://www.theses.fr/2013INPT0056

►

L’influence de traitements thermiques de revenu sur la corrosion localisée ainsi que sur la résistance mécanique en traction de l’alliage d’aluminium 2024 a été étudiée.… (more)

▼

L’influence de traitements thermiques de revenu sur la corrosion localisée ainsi que sur la résistance mécanique en traction de l’alliage d’aluminium 2024 a été étudiée. Cet alliage est utilisé en construction aéronautique, à l’état T351 (mise en solution, trempe, écrouissage et maturation) grâce aux ses propriétés mécaniques élevées ; à l’état T6 (mise en solution, trempe, revenu au pic de dureté) il présente un bon compromis résistance/ductilité. Par contre, la présence d’hétérogénéités microstructurales le rend sensible à la corrosion localisée. Le traitement T7 (mise en solution, trempe, revenu après pic de dureté) peut améliorer la tenue à la corrosion au détriment des propriétés mécaniques. Dans un premier temps, il s’est agit de déterminer les conditions d’obtention des états métallurgiques T6 et T7 à étudier, à partir des courbes de dureté Vickers en fonction du temps de traitement. Les états métallurgiques obtenus, la microstructure et les propriétés mécaniques à l’échelle macroscopique et locale, ont été analysés. Un point important de cette étude a consisté en la recherche d’une méthode optimale pour la détermination de la distribution des particules intermétalliques grossières, paramètre de premier ordre pour les couplages galvaniques mis en jeu lors de la dissolution des particules. Dans un second temps, le comportement en corrosion, à différentes échelles a été suivi. Des techniques électrochimiques tel que le tracé de courbes de polarisation potentiocinétique et le suivi de potentiel libre, ont permis d’évaluer l’influence du traitement de revenu sur comportement globale en corrosion. A l’échelle locale, la dissolution des particules intermétalliques grossières a été suivie par l’évolution du potentiel de surface en fonction des différents traitements thermiques. Cela a pu être déterminé par microscopie à force atomique, couplée à l’analyse chimique des phases obtenue par spectroscopie à sélection d’énergie. Le taux de corrosion ainsi que l’abattement des propriétés mécaniques à différentes échelles, ont clairement montré l’importance du traitement T7 par rapport au traitement T6. L’ensemble des résultats présente un intérêt industriel dans la mesure où la résistance à la corrosion associée aux propriétés mécaniques peuvent indiquer la probabilité de l’endommagement du matériau.

Nr

Advisors/Committee Members: Abrudeanu, Marioara (thesis director), Petit, Jacques-Alain (thesis director).

Subjects/Keywords: Alliages d’aluminium; Traitement thermique de revenu; Particules intermétalliques; Corrosion localisée; Abattement des propriétés mécaniques; Aluminum alloys; Income Thermal Treatment; Intermetallic particles; Localized Corrosion; Abatement of mechanical properties

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Radutoiu, N. (2013). Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2013INPT0056

Chicago Manual of Style (16^th Edition):

Radutoiu, Nicoleta. “Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy.” 2013. Doctoral Dissertation, INP Toulouse. Accessed January 16, 2021. http://www.theses.fr/2013INPT0056.

MLA Handbook (7^th Edition):

Radutoiu, Nicoleta. “Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy.” 2013. Web. 16 Jan 2021.

Vancouver:

Radutoiu N. Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy. [Internet] [Doctoral dissertation]. INP Toulouse; 2013. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2013INPT0056.

Council of Science Editors:

Radutoiu N. Influence des traitements thermiques sur le comportement en corrosion à l'échelle locale de l'alliage d'aluminium en AW 2024 : Influence of heat treatments on the corrosion behavior at the local scale of EN AW 2024 aluminum alloy. [Doctoral Dissertation]. INP Toulouse; 2013. Available from: http://www.theses.fr/2013INPT0056

27. Tria, Saoussen. Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications.

Degree: Docteur es, Matériaux, 2011, Belfort-Montbéliard

URL: http://www.theses.fr/2011BELF0155

►

Les travaux de recherches développés dans cette thèse concernent la réalisation de couchesminces, à partir de l’alliage à mémoire de forme (AMF) NiTi mécanoélaboré et… (more)

▼

Les travaux de recherches développés dans cette thèse concernent la réalisation de couchesminces, à partir de l’alliage à mémoire de forme (AMF) NiTi mécanoélaboré et de structurenanocristalline, en vue de leur intégration dans des microsystèmes. Le but est d’améliorer lespropriétés AMF de leurs homologues de structure microcristalline, dits conventionnels.Les techniques de caractérisation physico-chimiques (DRX, MET, MEB) nous ont permisd’une part, de suivre le mécanisme de formation de l’intermétallique B2-NiTi en fonction dutemps de broyage et d’autre part, de déterminer les paramètres microstructuraux à savoir, lataille des cristallites, le taux de microdéformations et la densité de dislocations des élémentspurs ainsi que ceux de la phase B2-NiTi. Ces paramètres révèlent le caractère nanocristallin etdésordonné des poudres broyées.Par ailleurs, nous avons fabriqué pour la première fois une cible B2-NiTi de structurenanocristalline, par l’intermédiaire d’une méthode alternative (mécanosynthèse et procédé deprojection à froid).Nous avons montré également qu’il est possible de déposer sous forme de couche mincel’intermétallique NiTi nanostructuré. Ce film mince d’épaisseur 447 nm a été déposé parpulvérisation cathodique à magnétron à partir de la cible élaborée par projection à froid (coldspray).

The research work developed in this thesis is related to preparing a thin film of NiTi shapememory alloy used to integrate into microsystems. The goal is to improve the properties oftheir counterparts of microcrystalline structure (conventional target).Physical and chemical techniques of characterization (XRD, TEM and SEM) have allowed onthe one hand, to follow the mechanism of intermetallic NiTi formation as a function ofmilling time and on the other hand, to determine the microstructural parameters : crystallitesize, the microstrain and dislocation density of the pure elements and the B2-NiTi phase.These parameters reveal the character of the disordered nanocrystalline of the milled powders.Furthermore, we fabricated a target of B2-NiTi nanocrystalline structure by an alternativemethod (mechanical alloying and cold spray).We also showed that it is possible to deposit the nanocrystalline NiTi intermetallic thin film.This film with a thickness of about 447 nm was deposited by magnetron sputtering techniquefrom the NiTi target.

Advisors/Committee Members: El-Kedim, Omar (thesis director).

Subjects/Keywords: AMF; Intermétallique NiTi; Mécanosynthèse; Projection à froid; Pulvérisation cathodique à magnétron; DRX; MET; Shape memory alloys; Intermetallic NiTi; Mechanical alloying; Cold spraying; Magnetron sputtering; X-ray diffraction; TEM

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APA (6^th Edition):

Tria, S. (2011). Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications. (Doctoral Dissertation). Belfort-Montbéliard. Retrieved from http://www.theses.fr/2011BELF0155

Chicago Manual of Style (16^th Edition):

Tria, Saoussen. “Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications.” 2011. Doctoral Dissertation, Belfort-Montbéliard. Accessed January 16, 2021. http://www.theses.fr/2011BELF0155.

MLA Handbook (7^th Edition):

Tria, Saoussen. “Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications.” 2011. Web. 16 Jan 2021.

Vancouver:

Tria S. Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications. [Internet] [Doctoral dissertation]. Belfort-Montbéliard; 2011. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2011BELF0155.

Council of Science Editors:

Tria S. Elaboration par mécanosynthèse et caractérisations d'alliages à mémoire de forme NiTi : application microsystèmes : Elaboration by mechanical alloying and characterization of shape memory alloys NiTi : microsystem applications. [Doctoral Dissertation]. Belfort-Montbéliard; 2011. Available from: http://www.theses.fr/2011BELF0155

Michigan State University

28. Foltz, John W. New metallurgical methods for joining NiTi.

Degree: MS, Department of Chemical Engineering and Materials Science, 2007, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:38663

Subjects/Keywords: Nickel-titanium alloys; Niobium – Metallurgy; Intermetallic compounds – Thermal properties; Physical metallurgy; Metal cladding

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Foltz, J. W. (2007). New metallurgical methods for joining NiTi. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:38663

Chicago Manual of Style (16^th Edition):

Foltz, John W. “New metallurgical methods for joining NiTi.” 2007. Masters Thesis, Michigan State University. Accessed January 16, 2021. http://etd.lib.msu.edu/islandora/object/etd:38663.

MLA Handbook (7^th Edition):

Foltz, John W. “New metallurgical methods for joining NiTi.” 2007. Web. 16 Jan 2021.

Vancouver:

Foltz JW. New metallurgical methods for joining NiTi. [Internet] [Masters thesis]. Michigan State University; 2007. [cited 2021 Jan 16]. Available from: http://etd.lib.msu.edu/islandora/object/etd:38663.

Council of Science Editors:

Foltz JW. New metallurgical methods for joining NiTi. [Masters Thesis]. Michigan State University; 2007. Available from: http://etd.lib.msu.edu/islandora/object/etd:38663

29. Chandrasekhar, Nita. Computational study of intermetallic and alloy membranes for hydrogen separation.

Degree: PhD, Chemical and Biomolecular Engineering, 2014, Georgia Tech

URL: http://hdl.handle.net/1853/51861

► Metal membranes are useful for hydrogen separation from mixed gas streams. They can exhibit perfect selectivity for hydrogen. However, in order to be commercially viable,… (more)

▼ Metal membranes are useful for hydrogen separation from mixed gas streams. They can exhibit perfect selectivity for hydrogen. However, in order to be commercially viable, in addition to providing high hydrogen fluxes, they must also be resistant to poisoning, possess long operating lifetimes and be cost effective. Many types of metal membranes such as pure metals, disordered alloys and amorphous metals have been studied for this application. In this work, we aim to identify intermetallic stoichiometric compounds of two or more metals that could be used as potential membrane materials for hydrogen separation. In the past, first principle calculations combined with Monte Carlo methods have been developed that can accurately predict H₂ fluxes through metal membranes at different hydrogen pressures and temperatures. Although these models are accurate, they are computationally intensive. In this work, we use these methods and develop screening criteria based on calculated properties that enable us to perform detailed calculations on a diminishing set of materials and rapidly identify the favorable candidates for hydrogen separation. We screened 1059 intermetallics at this high level of theory, which is the largest set of materials studied for this application. We divided the intermetallics into Pd-based and non-Pd based materials using additional screening algorithms to reduce the number of calculations required to identify potential candidate materials. 8 intermetallics were identified that had permeabilities that was comparable or higher to that of pure Pd. MgZn₂ and MnTi were found to have the highest H permeabilities among all the intermetallics studied. In addition to ground state structures, metastable structures were also found to be stabilized in the presence of hydrogen. Our work demonstrates the ability of these computational methods to identify potential novel materials for specific applications from large sets of materials that would not be possible experimentally. In the models for hydrogen permeability developed above, H-induced metal lattice rearrangements were not considered. Experimental evidence suggests that hydrogen heat treated (HHT) Pd-Au alloys undergo lattice rearrangement that results in an ordered structure which has a higher solubility than the non-HHT alloys. Using a combination of cluster expansion methods developed for predicting hydrogen permeability of disordered alloys and Monte Carlo methods, we predicted the extent of H induced lattice rearrangement in Pd₉₆Au₄ and Pd₈₅Au₁₅ alloys. We also predicted the solubility, diffusivity and permeability of these rearranged phases and found that their H permeability is higher than the non-rearranged phases. Our models capture the H-induced lattice rearrangement and provide useful insight of the conditions where this phenomenon is significant. Using the tools developed in this work, similar alloys that have a tendency to undergo lattice rearrangement that results in enhanced H permeability can be identified. Advisors/Committee Members: Sholl, David S. (advisor), Jones, Christopher W. (committee member), Sherrill, David (committee member), Filler, Michael A. (committee member), Fedorov, Andrei G. (committee member).

Subjects/Keywords: Intermetallics; Membranes; Alloys; DFT; Hydrogen; Membrane separation; Hydrogen; Intermetallic compounds

…9.3.4: Hydrogen Storage 118 9.4: Pd-Au Alloys 118 9.4.1: Impact and summary 118 9.5… …intermetallic selected as the representative structure of the space group. 23 Table 4.1: List of… …intermetallic compounds and the energy of the most favorable H binding site. The solubility for these… …intermetallic structures. The first column lists the name of the intermetallic; the second column… …lists the volumes of the intermetallic after volumetric expansion of the lattice in the…

12 more images…

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chandrasekhar, N. (2014). Computational study of intermetallic and alloy membranes for hydrogen separation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51861

Chicago Manual of Style (16^th Edition):

Chandrasekhar, Nita. “Computational study of intermetallic and alloy membranes for hydrogen separation.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 16, 2021. http://hdl.handle.net/1853/51861.

MLA Handbook (7^th Edition):

Chandrasekhar, Nita. “Computational study of intermetallic and alloy membranes for hydrogen separation.” 2014. Web. 16 Jan 2021.

Vancouver:

Chandrasekhar N. Computational study of intermetallic and alloy membranes for hydrogen separation. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/1853/51861.

Council of Science Editors:

Chandrasekhar N. Computational study of intermetallic and alloy membranes for hydrogen separation. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/51861

The Ohio State University

30. Jain, Syadwad. Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors.

Degree: PhD, Materials Science and Engineering, 2006, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1145140821

► In this study, the localized corrosion and conversion coating on cast alloys 356 (Al-7.0Si-0.3Mg) and 380 (Al-8.5Si-3.5Cu-1.6Fe) were characterized. The intermetallic phases presence in… (more)

▼ In this study, the localized corrosion and conversion coating on cast alloys 356 (Al-7.0Si-0.3Mg) and 380 (Al-8.5Si-3.5Cu-1.6Fe) were characterized. The intermetallic phases presence in the permanent mold cast alloy 356 are primary-Si, Al₅FeSi, Al₈Si₆Mg₃Fe and Mg₂Si. The die cast alloy 380 is rich in Cu and Fe elements. These alloying elements result in formation of the intermetallic phases Al₅FeSi, Al₂Cu and Al(FeCuCr) along with primary-Si. The Cu- and Fe-rich IMPs are cathodic with respect to the matrix phase and strongly govern the corrosion behavior of the two cast alloys in an aggressive environment due to formation of local electrochemical cell in their vicinity. Results have shown that corrosion behavior of permanent mould cast alloy 356 is significantly better than the die cast aluminum alloy 380, primarily due to high content of Cu- and Fe- rich phases such as Al₂Cu and Al₅FeSi in the latter. The IMPs also alter the protection mechanism of the cast alloys in the presence of inhibitors in an environment. The presence of chromate in the solution results in reduced cathodic activity on all the phases. Chromate provides some anodic inhibition by increasing pitting potentials and altering corrosion potentials for the phases. Results have shown that performance of CCC was much better on 356 than on 380, primarily due to inhomogeneous and incomplete coating deposition on Cu- and Fe- phases present in alloy 380. XPS and Raman were used to characterize coating deposition on intermetallics. Results show evidence of cyanide complex formation on the intermetallic phases. The presence of this complex is speculated to locally suppress CCC formation. Formation and breakdown of cerium conversion coatings on 356 and 380 was also analyzed. Results showed that deposition of cerium hydroxide started with heavy precipitation on intermetallic particles with the coatings growing outwards onto the matrix. Electrochemical analysis of synthesized intermetallics compounds in the presence of soluble cerium cations showed that of anodic and cathodic activity was not as strongly inhibited as was observed for chromate ions. Overall cerium conversion coating showed good performance on Al-Si (356) ally, but poor performance on Fe- and Cu-rich alloy (380). Advisors/Committee Members: Buchheit, Rudolph (Advisor).

Subjects/Keywords: Engineering, Materials Science; ALLOYS; CHROMATE; conversion coating; coating; CORROSION; intermetallic; aluminum alloy

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APA (6^th Edition):

Jain, S. (2006). Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1145140821

Chicago Manual of Style (16^th Edition):

Jain, Syadwad. “Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors.” 2006. Doctoral Dissertation, The Ohio State University. Accessed January 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1145140821.

MLA Handbook (7^th Edition):

Jain, Syadwad. “Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors.” 2006. Web. 16 Jan 2021.

Vancouver:

Jain S. Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors. [Internet] [Doctoral dissertation]. The Ohio State University; 2006. [cited 2021 Jan 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1145140821.

Council of Science Editors:

Jain S. Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors. [Doctoral Dissertation]. The Ohio State University; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1145140821

Open Access Theses and Dissertations