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LuoWeiqi2005 mt.pdf (9.66 MB)
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Abstract Header
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions
Author Info
Luo, Weiqi
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850
Abstract Details
Year and Degree
2005, Master of Science, Ohio State University, Materials Science and Engineering.
Abstract
The microstructure of a material has a great influence on its properties. Therefore, understanding underlying mechanisms of microstructural evolution is critical for developing desired properties. However, microstructural evolution is highly non-linear and, at this stage, fundamental quantitative understanding of it is limited. There has been an increasing demand lately for modeling and simulating microstructural evolution. That is not only because they have a relatively lower cost than experiment, and can be performed for arbitraries conditions, but also they can provide fundamental understanding of experimental observations, and its ability to predict the evolution. Moreover, a quantitative predictive model will be very usefully to guide process design in various industry applications. For this reason, many computer models have been developed. Among them, the phase field method has become a rigorous approach to simulating complex microstructural evolution, such as martensitic transformation, dendritic growth, dislocation movement and grain growth. The effect of nucleating ordered precipitates at dislocations and the subsequent growth on particle morphology in Ni-Al and Al-Li through phase field method study is presented in this thesis. Results show that this process yields the splitting pattern that is observed experimentally. In particular, the structural discontinuity associated with an edge dislocation may lead to the formation of an antiphase domain boundary within an ordered phase particle. At this stage, the application of phase field methods in industry is still limited because many phase field models are qualitative in nature. The development of a quantitative phase field model for the Fe-Cr-C system by designing an appropriate energy expression and linking the thermodynamic and kinetics parameters to quantitative databases is presented in this thesis. This model is validated and its capability is shown in the corresponding chapter.
Committee
Yunzhi Wang (Advisor)
Glenn S. Daehn (Committee Member)
Pages
103 p.
Subject Headings
Materials Science
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Citations
Luo, W. (2005).
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions
[Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850
APA Style (7th edition)
Luo, Weiqi.
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions.
2005. Ohio State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850.
MLA Style (8th edition)
Luo, Weiqi. "Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions." Master's thesis, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850
Chicago Manual of Style (17th edition)
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Document number:
osu1407398850
Download Count:
334
Copyright Info
© 2005, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.