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Theory and modeling of microstructur...

Ma, Ning.

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Theory and modeling of microstructural evolution in polycrystalline materials: Solute segregation, grain growth and phase transformations.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Theory and modeling of microstructural evolution in polycrystalline materials: Solute segregation, grain growth and phase transformations./
作者:	Ma, Ning.
面頁冊數:	199 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2770.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3176377
ISBN:	0542153378

Theory and modeling of microstructural evolution in polycrystalline materials: Solute segregation, grain growth and phase transformations.
Ma, Ning.

Theory and modeling of microstructural evolution in polycrystalline materials: Solute segregation, grain growth and phase transformations. - 199 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2770.

Thesis (Ph.D.)--The Ohio State University, 2005.

To accurately predict microstructure evolution and, hence, to synthesis metal and ceramic alloys with desirable properties involves many fundamental as well as practical issues. In the present study, novel theoretical and phase field approaches have been developed to address some of these issues including solute drag and segregation transition at grain boundaries and dislocations, grain growth in systems of anisotropic boundary properties, and precipitate microstructure development in polycrystalline materials. The segregation model has allowed for the prediction of a first-order segregation transition, which could be related to the sharp transition of solute concentration of grain boundary as a function of temperature. The incorporating of interfacial energy and mobility as functions of misorientation and inclination in the phase field model has allowed for the study of concurrent grain growth and texture evolution. The simulation results were analyzed using the concept of local grain boundary energy density, which simplified significantly the development of governing equations for texture controlled grain growth in Ti-6Al-4V. Quantitative phase field modeling techniques have been developed by incorporating thermodynamic and diffusivity databases. The models have been validated against DICTRA simulations in simple 1D problems and applied to simulate realistic microstructural evolutions in Ti-6Al-4V, including grain boundary a and globular a growth and sideplate development under both isothermal aging and continuous cooling conditions. The simulation predictions agree well with experimental observations.

ISBN: 0542153378Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Theory and modeling of microstructural evolution in polycrystalline materials: Solute segregation, grain growth and phase transformations.
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502 $a Thesis (Ph.D.)--The Ohio State University, 2005.
520 $a To accurately predict microstructure evolution and, hence, to synthesis metal and ceramic alloys with desirable properties involves many fundamental as well as practical issues. In the present study, novel theoretical and phase field approaches have been developed to address some of these issues including solute drag and segregation transition at grain boundaries and dislocations, grain growth in systems of anisotropic boundary properties, and precipitate microstructure development in polycrystalline materials. The segregation model has allowed for the prediction of a first-order segregation transition, which could be related to the sharp transition of solute concentration of grain boundary as a function of temperature. The incorporating of interfacial energy and mobility as functions of misorientation and inclination in the phase field model has allowed for the study of concurrent grain growth and texture evolution. The simulation results were analyzed using the concept of local grain boundary energy density, which simplified significantly the development of governing equations for texture controlled grain growth in Ti-6Al-4V. Quantitative phase field modeling techniques have been developed by incorporating thermodynamic and diffusivity databases. The models have been validated against DICTRA simulations in simple 1D problems and applied to simulate realistic microstructural evolutions in Ti-6Al-4V, including grain boundary a and globular a growth and sideplate development under both isothermal aging and continuous cooling conditions. The simulation predictions agree well with experimental observations.
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