Role of strain reversal in grain refinement by severe plastic deformation

被引：66
|
作者：
Orlov, Dmitry [1 ]
Todaka, Yoshikazu [2 ]
Umemoto, Minoru [2 ]
Tsuji, Nobuhiro [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn, Dept Adapt Machine Syst, Suita, Osaka 5650871, Japan
[2] Toyohashi Univ Technol, Dept Prod Syst Engn, Aichi 4418580, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 499卷 / 1-2期
关键词：
Strain reversal; Aluminum; HPT; EBSD; TEM; Grain subdivision; HIGH-PRESSURE TORSION; PURE COPPER; MICROSTRUCTURES; ALUMINUM; PATH; EVOLUTION; ALLOY;
D O I：
10.1016/j.msea.2008.09.036
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Most of severe plastic deformation processes involve strain reversal. Till now quite big number of researches has been done on indirect study of its role, which discusses the effect of loading path in ultra-fine grained structure formation. This work is aimed to study directly the role of the strain reversal in grain refinement by severe plastic deformation. A 99.99% purity aluminum was processed by high pressure torsion up to 96 degrees rotation (maximal equivalent strain epsilon approximate to 8) with two deformation modes: monotonic and reversal deformations with a step of 12 degrees rotation (maximal equivalent strain epsilon approximate to 1). It was shown that strain reversal retarded the grain refinement in comparison with the monotonic deformation. This explains slower rate of the nanostructure formation of the SPD processes that involve strain reversal. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：427 / 433
页数：7
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