High temperature compressive deformation behavior of an extruded Mg-8Gd-3Y-0.5Zr (wt.%) alloy

被引：22
作者：
Li, D. J. [1 ]
Wang, Q. D. [1 ,2 ]
Blandin, J. J. [3 ]
Suery, M. [3 ]
Dong, J. [1 ]
Zeng, X. Q. [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[3] UJF, CNRS, Grenoble INP, Lab SIMAP,GPM2, F-38402 St Martin Dheres, France
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 526卷 / 1-2期
关键词：
Mg-Gd-Y-Zr alloy; High temperature mechanical behavior; Grain boundary sliding; Lattice diffusion; Dislocation climb; AL-MG ALLOYS; MAGNESIUM ALLOY; SUPERPLASTIC DEFORMATION; GRAIN-SIZE; DEPENDENCE; CREEP; GLIDE;
D O I：
10.1016/j.msea.2009.07.015
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The deformation behavior of an extruded Mg-8Gd-3Y-0.5Zr alloy has been characterized by compression tests in the temperature range of 400-490 degrees C and strain rate range of 10(-4) s(-1) to 10(-2) s(-1) with the objective to evaluate the superplastic deformation conditions as well as the rate-control ling mechanisms. The strain rate sensitivity index m decreases with increasing temperature in the strain rate range of 10(-4) s(-1) to 5 x 10(-4) s(-1), which was attributed to grain growth. Optimum superplasticity characterized by grain boundary sliding accommodated by dislocation creep was obtained at 400 degrees C and at 10(-4) s(-1). Dynamic precipitation leading to precipitates distributed mainly in the grain boundaries was responsible for the stable microstructure and the increase of the stress during deformation under this condition. Moreover, at strain rate higher than 5 x 10(-4) s(-1), it remained relatively constant of about m approximate to 0.3 and the activation energy Q was found to be equal to 131 kJ/mol which was close to the activation energy for lattice diffusion of Mg. (C) 2009 Elsevier B.V. All rights reserved.
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页码：150 / 155
页数：6
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