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Title: Diffuse interface approach to modeling crystal plasticity with accommodation of grain boundary sliding

Abstract

In diffuse-interface (phase field) models of polycrystalline solids, the grain boundaries naturally possess a narrow region of finite thickness. A Ginzburg-Landau type kinetic equation for plastic deformation of a solid is derived that combines crystal plasticity and J 2 plasticity. Within such a framework for a polycrystal the grain interior can be defined by crystal plasticity, and the grain boundary region can be assigned J 2 type plasticity. The two are connected smoothly. This enables the modeling framework to accommodate grain boundary sliding (GBS), an important deformation mechanism for creep. The relaxation of elastic modulus of a polycrystalline solid and the power-law creep (both accommodated by GBS) are reported on by 2D and 3D simulations, respectively, and the results are compared to the 2D finite-element simulations of Ghahremani and Crossman-Ashby. A strong grain shape dependence and orientation dependence (for non-equiaxed grains) of the GBS effect are predicted by this model.

Authors:
 [1];  [2];  [2]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, South Park, PA (United States)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)
OSTI Identifier:
1532664
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cheng, Tian-Le, Wen, You-Hai, and Hawk, Jeffrey A. Diffuse interface approach to modeling crystal plasticity with accommodation of grain boundary sliding. United States: N. p., 2018. Web. doi:10.1016/j.ijplas.2018.10.012.
Cheng, Tian-Le, Wen, You-Hai, & Hawk, Jeffrey A. Diffuse interface approach to modeling crystal plasticity with accommodation of grain boundary sliding. United States. doi:10.1016/j.ijplas.2018.10.012.
Cheng, Tian-Le, Wen, You-Hai, and Hawk, Jeffrey A. Sun . "Diffuse interface approach to modeling crystal plasticity with accommodation of grain boundary sliding". United States. doi:10.1016/j.ijplas.2018.10.012. https://www.osti.gov/servlets/purl/1532664.
@article{osti_1532664,
title = {Diffuse interface approach to modeling crystal plasticity with accommodation of grain boundary sliding},
author = {Cheng, Tian-Le and Wen, You-Hai and Hawk, Jeffrey A.},
abstractNote = {In diffuse-interface (phase field) models of polycrystalline solids, the grain boundaries naturally possess a narrow region of finite thickness. A Ginzburg-Landau type kinetic equation for plastic deformation of a solid is derived that combines crystal plasticity and J2 plasticity. Within such a framework for a polycrystal the grain interior can be defined by crystal plasticity, and the grain boundary region can be assigned J2 type plasticity. The two are connected smoothly. This enables the modeling framework to accommodate grain boundary sliding (GBS), an important deformation mechanism for creep. The relaxation of elastic modulus of a polycrystalline solid and the power-law creep (both accommodated by GBS) are reported on by 2D and 3D simulations, respectively, and the results are compared to the 2D finite-element simulations of Ghahremani and Crossman-Ashby. A strong grain shape dependence and orientation dependence (for non-equiaxed grains) of the GBS effect are predicted by this model.},
doi = {10.1016/j.ijplas.2018.10.012},
journal = {International Journal of Plasticity},
number = C,
volume = 114,
place = {United States},
year = {2018},
month = {10}
}

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