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Phase-field models of microstructure...

Hu, Shenyang.

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Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects./
作者:	Hu, Shenyang.
面頁冊數:	239 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3646.
Contained By:	Dissertation Abstracts International65-07B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3141002
ISBN:	0496881389

Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects.
Hu, Shenyang.

Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects. - 239 p.

Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3646.

Thesis (Ph.D.)--The Pennsylvania State University, 2004.

In this thesis, the phase-field approach is employed to study the effect of elastic inhomogeneity and structural defects on phase separation kinetics and morphological evolution in bulk and film systems, the precipitation of theta ' phase (Al2Cu) in Al-Cu alloys, and solute strengthening of alloys.

ISBN: 0496881389Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects.
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245 1 0 $a Phase-field models of microstructure evolution in a system with elastic inhomogeneity and defects.
300 $a 239 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3646.
500 $a Adviser: LongQing Chen.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2004.
520 $a In this thesis, the phase-field approach is employed to study the effect of elastic inhomogeneity and structural defects on phase separation kinetics and morphological evolution in bulk and film systems, the precipitation of theta ' phase (Al2Cu) in Al-Cu alloys, and solute strengthening of alloys.
520 $a By combining the iteration method for calculating the elastic energy and a semi-implicit spectral method for solving the Cahn-Hilliard equation an extremely efficient phase-field model is developed for studying morphological evolution in coherent systems with large elastic inhomogeneity.
520 $a Spinodal decomposition in a thin film with periodically distributed arrays of interfacial dislocations is simulated. The results show that the periodic stress field associated with the array of interfacial dislocations leads to a directional phase separation and the formation of ordered microstructures.
520 $a The metastable theta' (Al2Cu) precipitates are one of the primary strengthening precipitates in Al-Cu alloys. They are of a plate-like shape with strong interfacial energy and mobility anisotropies. A phase-field model which can automatically incorporate the thermodynamic and kinetic information from databases is developed. The relationships between phase-field model parameters and material thermodynamic and kinetic properties are established. Systematic simulations of theta' growth in 1D, 2D and 3D are carried out. The growth of a single theta ' precipitate in 1D exactly reproduces the results from analytical solutions. The phase-filed model can serve as a basis for quantitative understanding of the influence of elastic energy, interface energy anisotropy and interface mobility anisotropy on the precipitation of theta' in Al-Cu alloys.
520 $a Precipitates and solutes are commonly used to strengthen alloys. A phase field model of dislocation dynamics, which employs 12 order parameter fields to describe the dislocation distribution in a single fcc crystal, and one composition field to describe the solute distribution, is developed for a binary alloy. This model is able to simulate phase transformation, solute diffusion, dislocation motion as well as their interaction under applied stresses. A new functional form for describing the eigenstrains of dislocations is constructed, which eliminates the dependence of the magnitude of the dislocation Burgers vector on applied stresses and provides a correct dislocation stress field. (Abstract shortened by UMI.)
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790 $a 0176
791 $a Ph.D.
792 $a 2004
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