Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions
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2005
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu14073988502021-08-03T06:26:43Z Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions Luo, Weiqi Materials Science 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. 2005 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850 http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Materials Science |
| spellingShingle |
Materials Science Luo, Weiqi Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| author |
Luo, Weiqi |
| author_facet |
Luo, Weiqi |
| author_sort |
Luo, Weiqi |
| title |
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| title_short |
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| title_full |
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| title_fullStr |
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| title_full_unstemmed |
Fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| title_sort |
fundamental and practical applications of phase field method to the study of alloy microstructure evolutions |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2005 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1407398850 |
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AT luoweiqi fundamentalandpracticalapplicationsofphasefieldmethodtothestudyofalloymicrostructureevolutions |
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