Low temperature superplasticity of AZ91 magnesium alloy with non-equilibrium grain boundaries

被引：355
作者：
Mabuchi, M
Ameyama, K
Iwasaki, H
Higashi, K
机构：
[1] Natl Ind Res Inst Nagoya, Kita Ku, Nagoya, Aichi 4628510, Japan
[2] Ritsumeikan Univ, Dept Engn Mech, Fac Sci & Engn, Shiga 5258577, Japan
[3] Himeji Inst Technol, Dept Mat Sci & Engn, Coll Engn, Himeji, Hyogo 6712201, Japan
[4] Univ Osaka Prefecture, Coll Engn, Dept Met & Mat Sci, Osaka 5998531, Japan
来源：
ACTA MATERIALIA | 1999年 / 47卷 / 07期
关键词：
metals; grain boundaries; mechanical properties; superplasticities;
D O I：
10.1016/S1359-6454(99)00094-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The superplastic behavior of a fine-grained AZ91 alloy, processed by equal channel angular extrusion, has been investigated in a low temperature range of 423-523 K. The experimental results showed a stress exponent of 2 and the activation energy for superplastic flow was in agreement with that for grain boundary diffusion of magnesium. The alloy with non-equilibrium grain boundary structures exhibited lower superplastic elongation than the alloy with equilibrium grain boundaries. Furthermore, the strain rate for superplastic flow of the former was lower than that of the latter. These differences probably arise because the accommodation process for grain boundary sliding is hampered by the long-range stresses associated with the non-equilibrium grain boundaries. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2047 / 2057
页数：11
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