A microstructure-based model of the deformation mechanisms and flow stress during elevated-temperature straining of a magnesium alloy

被引：8
作者：
Cipoletti, David E. [1 ]
Bower, Allan F. [1 ]
Krajewski, Paul E. [2 ]
机构：
[1] Brown Univ, Sch Engn, Providence, RI 02912 USA
[2] Gen Motors Co, Warren, MI 48090 USA
来源：
SCRIPTA MATERIALIA | 2011年 / 64卷 / 10期
关键词：
Magnesium alloys; Finite element analysis; Creep; Grain boundary sliding; Grain boundary diffusion; FINITE-ELEMENT-METHOD; CONSTITUTIVE RESPONSE; THRESHOLD STRESS; AZ31; SLIP; POLYCRYSTALS; EVOLUTION; BEHAVIOR; AL;
D O I：
10.1016/j.scriptamat.2010.12.033
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We show that the variation of flow stress with strain rate and grain size in a magnesium alloy deformed at a constant strain rate and 450 degrees C can be predicted by a crystal plasticity model that includes grain boundary sliding and diffusion. The model predicts the grain size dependence of the critical strain rate that will cause a transition in deformation mechanism from dislocation creep to grain boundary sliding, and yields estimates for grain boundary fluidity and diffusivity. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：931 / 934
页数：4
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