Enhanced superplasticity and diffusional creep in ultrafine-grained Mg-6Al-1Zn alloy with high thermal stability

被引：30
作者：
Kim, W. J. [1 ]
Park, I. B. [1 ]
机构：
[1] Hongik Univ, Seoul 121791, South Korea
来源：
SCRIPTA MATERIALIA | 2013年 / 68卷 / 3-4期
关键词：
Severe plastic deformation; Magnesium alloys; Superplasticity; Grain refining; Ultrafine-grained microstructure; MAGNESIUM ALLOY; DEFORMATION MECHANISM; ECAP; MICROSTRUCTURE; TEMPERATURES; EXTRUSION; EVOLUTION;
D O I：
10.1016/j.scriptamat.2012.10.011
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultrafine-grained Mg-6Al-1Zn alloys, which have beta-Mg17Al12 70-140 nm particles preferentially located at the grain boundaries, exhibited excellent thermal stability and superplasticity at high temperatures. Diffusional creep (Coble creep), which has rarely been reported in other ultrafine-grained Mg alloys and composites, becomes dominant over the grain boundary sliding mechanism at strain rates near 10(-4) s(-1) 523-573 K. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：179 / 182
页数：4
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