Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(fine grain strengthening). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


NSYSU

1. Tsai, Wei-Yu. Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment.

Degree: PhD, Materials and Optoelectronic Science, 2017, NSYSU

In this research, we used Ultrasonic shot peening equipment as the tool, conducting nano-crystallization and surface mechanical coating experiments. Detailed experimental methods, results and discussion are presented separately as SMAT and UMCA parts in the manuscript. For the first part, the analytic modeling and one experimental assess of the ultrasonic surface mechanical attrition treatment (SMAT) are presented. The bombarding ball speed, induced energy, and the resulting sample hardness, experienced depth and grain size are incorporated into this model, based on harmonic longitudinal vibration motion of ultrasonic-wave-driven ball impact onto the sample surface. An experimental assessment by using a stainless steel flat sample is conducted, and the comparison of the model and experiment is reported. There appear some optimum SMAT working parameters for the best SMAT effect, locating within the ranges of 1-2 mm for the ball size, 8-10 m/s for the ball speed, 4-5x102 s-1 for the strain rate, and 70-75 mJ for the input energy. Beyond the optimum SMAT parameters, the sample surface would be subject to bombarding micro-cracking and the grain size would not be further reduced. Instead, the grain size becomes larger and the hardness becomes lower. The benefits from SMAT would become lower. We used 1050 aluminum alloys, which often serve as heat sink in light-emitting diode (LED) lighting, are inherent with a high thermal conductivity, but poor thermal total emissivity. Thus, high emissive coatings on the Al substrate can enhance the thermal dissipation efficiency of radiation. In this study, the ultrasonic mechanical coating and armoring (UMCA) technique was used to insert various ceramic combinations, such as Al2O3, SiO2, graphite and carbon nanotube to enhance thermal dissipation. Analytic models have been established to couple the thermal radiation and convection on the sample surface through heat flow equations. A promising match has been reached between the theoretical estimations and experimental measurements. With the adequate insertion of ceramic powders, the heat can be transferred to thermal radiation and emitted. The temperature of the Al plates and heat sinks can be lowered by 5â11°C, which is highly favorable for applications requiring cooling components. Advisors/Committee Members: Chih-Ching Huang (committee member), Che-Hsin Lin (chair), Cheng-Tang Pan (chair), Hsuan-Kai Lin (chair), Shian-Ching Jang (chair).

Subjects/Keywords: surface mechanical attrition treatment; grain refinement; fine grain strengthening; ultrasonic mechanical coating and armoring; heat dissipation coating

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Tsai, W. (2017). Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0426117-103718

Chicago Manual of Style (16th Edition):

Tsai, Wei-Yu. “Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment.” 2017. Doctoral Dissertation, NSYSU. Accessed April 19, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0426117-103718.

MLA Handbook (7th Edition):

Tsai, Wei-Yu. “Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment.” 2017. Web. 19 Apr 2019.

Vancouver:

Tsai W. Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment. [Internet] [Doctoral dissertation]. NSYSU; 2017. [cited 2019 Apr 19]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0426117-103718.

Council of Science Editors:

Tsai W. Microstructures and properties of nano-grain refined 304 stainless steel and ceramic-powder inserted Al processed by ultrasonic surface mechanical attrition treatment. [Doctoral Dissertation]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0426117-103718


Kyoto University / 京都大学

2. Gao, Si. Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象.

Degree: 博士(工学), 2016, Kyoto University / 京都大学

新制・課程博士

甲第19708号

工博第4163号

Subjects/Keywords: yield point; ultra-fine grain; tensile behavior; grain refinement strengthening; strain localization

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Gao, S. (2016). Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/215534 ; http://dx.doi.org/10.14989/doctor.k19708

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

Chicago Manual of Style (16th Edition):

Gao, Si. “Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象.” 2016. Thesis, Kyoto University / 京都大学. Accessed April 19, 2019. http://hdl.handle.net/2433/215534 ; http://dx.doi.org/10.14989/doctor.k19708.

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

MLA Handbook (7th Edition):

Gao, Si. “Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象.” 2016. Web. 19 Apr 2019.

Vancouver:

Gao S. Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象. [Internet] [Thesis]. Kyoto University / 京都大学; 2016. [cited 2019 Apr 19]. Available from: http://hdl.handle.net/2433/215534 ; http://dx.doi.org/10.14989/doctor.k19708.

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

Council of Science Editors:

Gao S. Yield Point Phenomena in Ultrafine Grained Materials : 超微細粒材料における降伏点降下現象. [Thesis]. Kyoto University / 京都大学; 2016. Available from: http://hdl.handle.net/2433/215534 ; http://dx.doi.org/10.14989/doctor.k19708

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


Kyoto University

3. Gao, Si. Yield Point Phenomena in Ultrafine Grained Materials .

Degree: 2016, Kyoto University

Subjects/Keywords: yield point; ultra-fine grain; tensile behavior; grain refinement strengthening; strain localization

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Gao, S. (2016). Yield Point Phenomena in Ultrafine Grained Materials . (Thesis). Kyoto University. Retrieved from http://hdl.handle.net/2433/215534

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

Chicago Manual of Style (16th Edition):

Gao, Si. “Yield Point Phenomena in Ultrafine Grained Materials .” 2016. Thesis, Kyoto University. Accessed April 19, 2019. http://hdl.handle.net/2433/215534.

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

MLA Handbook (7th Edition):

Gao, Si. “Yield Point Phenomena in Ultrafine Grained Materials .” 2016. Web. 19 Apr 2019.

Vancouver:

Gao S. Yield Point Phenomena in Ultrafine Grained Materials . [Internet] [Thesis]. Kyoto University; 2016. [cited 2019 Apr 19]. Available from: http://hdl.handle.net/2433/215534.

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

Council of Science Editors:

Gao S. Yield Point Phenomena in Ultrafine Grained Materials . [Thesis]. Kyoto University; 2016. Available from: http://hdl.handle.net/2433/215534

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

.