Role of strain reversal in grain refinement by severe plastic deformation
Role of strain reversal in grain refinement by severe plastic deformation
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DOI：
10.1016/j.msea.2008.09.036
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发表时间：
2009-01-15
期刊：
影响因子：
6.4
通讯作者：
Tsuji, Nobuhiro
中科院分区：
文献类型：
--
作者：
Orlov, Dmitry;Todaka, Yoshikazu;Tsuji, Nobuhiro
大部分剧烈塑性变形过程都涉及应变反转。迄今为止，已有大量的研究是从间接的角度来探讨加载路径在超细晶组织形成中的作用。本工作旨在直接研究应变反转在剧烈塑性变形晶粒细化中的作用。对纯度为99.99%的纯铝进行了96 °旋转（最大等效应变量ε = 8）的高压扭转加工，采用单调和12 °旋转（最大等效应变量ε = 1）的反向两种变形方式。结果表明，与单调变形相比，应变反转阻碍了晶粒细化。这解释了涉及应变反转的SPD过程的纳米结构形成的较慢速率。(C)2008 Elsevier B.V.保留所有权利。
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.