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

被引：66

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

页码：17 / 22

页数：6

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