Ultrafine-grained Mg-9Li-1Zn alloy sheets exhibiting low temperature superplasticity

被引:64
作者
Kim, W. J. [1 ]
Kim, M. J. [1 ]
Wang, J. Y. [2 ]
机构
[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea
[2] Natl Dong Hwa Univ, Dept Mat Sci & Engn, Shoufeng 97401, Hualien, Taiwan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 516卷 / 1-2期
关键词
Severe plastic deformation; Magnesium alloys; Fine grains; Superplasticity; Rolling; MECHANICAL-PROPERTIES; LI ALLOY; BEHAVIOR; MICROSTRUCTURE; DEFORMATION;
D O I
10.1016/j.msea.2009.03.089
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The microstructure and mechanical properties of the ultrafine grained Mg-9Li-1Zn (LZ91) alloy sheets prepared through HRDSR (high-speed-ratio differential speed rolling) process were examined. During HRDSR for a thickness reduction of 65% by a single pass at 398 K, the microstructure was significantly refined to grains with submicron size and the refined microstructure was homogeneous along thickness direction of a sheet. The HRDSRed alloy exhibited enhanced strength and ductility at room temperature, and excellent low temperature superplasticity in the temperature range 423-523 K (0.49-0.6 T(m)). The superplastic elongations were comparable with those obtained by other severe-plastic-deformation techniques or even better. The superplastic deformation mechanism of the ultrafine grained LZ91 alloy in the temperature range between 423 and 523 K was found to be grain-boundary-diffusion controlled grain boundary sliding. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:17 / 22
页数:6
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