Microstructure and superplasticity of AZ31 sheet fabricated by differential speed rolling

被引：24
作者：
Jeong, H. G. [2 ]
Jeong, Y. G. [2 ]
Kim, W. J. [1 ]
机构：
[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea
[2] KITECH, Mfg Proc Res Ctr, Digital Prod Proc Team, Inchon 463130, South Korea
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 483卷 / 1-2期
关键词：
Metals and alloys; Grain boundaries; Transmission electron microscopy; TEM; MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; 2-STAGE DEFORMATION; RECRYSTALLIZATION;
D O I：
10.1016/j.jallcom.2008.08.130
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Microstructure evolution and superplasticity in AZ31 alloy by differential speed rolling (DSR) with a highspeed ratio (=3) between the upper and lower rolls was examined. With increase in thickness reduction by DSR at 473 K, degree of grain refinement and microstructure homogeneity increased. The microstructure obtained by a single rolling pass for a 70% reduction in thickness consisted of recrystallized grains with a mean size of similar to 2 mu m, and fraction of HAGBs and average misorientation angle determined by the EBSD analysis were 0.47 and 23.21 degrees, respectively. The DSR AZ31 alloy exhibited enhanced superplasticity as compared with the conventionally processed AZ31. A maximum elongation of 830% was obtained at 2 x 10(-4) s(-1) and 673 K. The strain hardening exponent measured at 2 x 10(-4) s(-1) and 673 K was as high as 0.71, which could be related to accelerated grain growth in the highly refined microstructure during superplastic flow. (C) 2008 Elsevier B.V. All rights reserved.
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收藏
页码：279 / 282
页数：4
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