Reorientation and stress relaxation due to twinning:: Modeling and experimental characterization for Mg

被引：411

作者：

Clausen, B. ^{[1
]}

Tome, C. N. ^{[2
]}

Brown, D. W. ^{[2
]}

Agnew, S. R. ^{[3
]}

机构：

[1] Los Alamos Natl Lab, LANSCE LC, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, MST 8, Los Alamos, NM 87545 USA

[3] Univ Virginia, Charlottesville, VA 22904 USA

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 11期

关键词：

neutron diffraction; magnesium alloys; twinning; texture; elastic-plastic self-consistent (EPSC) model;

D O I：

10.1016/j.actamat.2008.01.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study of the mechanical response of Mg AZ31 when deformed under twinning dominated conditions is presented. In addition to the well-known rapid texture variation, neutron diffraction measurements reveal a 'sense-reversal' of the internal stress in the twinned grains. The latter is characterized experimentally and an elasto-plastic polycrystal model is extended in order to account for twin domain reorientation and associated stress relaxation. It is concluded that the texture variation due to twinning is sufficient to explain the observed macroscopic stress-strain response. However, the evolution of internal stresses in diffracting subsets of grains is complex and more challenging to explain. It seems to be strongly controlled by the order in which slip and twinning are activated, the stress relaxation associated with twin propagation, and neighbor constraint effects. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2456 / 2468

页数：13

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