Viscous nature of deformation of ultra-fine grain aluminum processed by equal-channel angular pressing

被引：65
|
作者：
Miyamoto, H [1 ]
Ota, K [1 ]
Mimaki, T [1 ]
机构：
[1] Doshisha Univ, Fac Engn, Dept Mech Engn, Kyotanabe 9100321, Japan
来源：
SCRIPTA MATERIALIA | 2006年 / 54卷 / 10期
关键词：
ultra-fine rained microstructure; aluminum; equal-channel angular pressing (ECAP); strain-rate sensitivity; low temperature deformation;
D O I：
10.1016/j.scriptamat.2006.02.016
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Deformation and microstructural evolution of ultra-fine grained (UFG) aluminum produced by equal-channel angular pressing has been examined over a wide range of strain-rates at room temperature and liquid nitrogen temperature (77 K). Elevated strain-rate sensitivity of UFG structures at both temperatures was revealed and compared with the coarse-grain counterparts. Results indicated that this enhanced viscous nature may be attributed in part to an increase in dislocation density as well as to some sort of reaction related to grain boundary diffusivity. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1721 / 1725
页数：5
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