On the threshold stress for superplasticity in Mg-Al-Zn alloys

被引：31
作者：
del Valle, J. A. [1 ]
Carreno, F. [1 ]
Ruano, O. A. [1 ]
机构：
[1] Ctr Nacl Invest Metalurg, Dept Phys Metallurg, CSIC, Madrid 28040, Spain
来源：
SCRIPTA MATERIALIA | 2007年 / 57卷 / 09期
关键词：
magnesium alloys; grain boundary sliding; superplasticity;
D O I：
10.1016/j.scriptamat.2007.07.002
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High threshold stresses for superplasticity are often reported in both Mg-Al-Zn alloys and reinforced magnesium alloys. However, the threshold stresses in Mg-Al-Zn and reinforced alloys differ in their temperature and grain size dependence. It is shown in this work that the origin of the apparent threshold stresses in the Mg-Al-Zn alloys arise from an inadequate assumption of an n = 2 power law in the transition zone between grain boundary sliding and slip creep or to a grain growth effect on the flow stress at low strain rates. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：829 / 832
页数：4
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