Strain hardening, strain rate sensitivity, and ductility of nanostructured metals
Strain hardening, strain rate sensitivity, and ductility of nanostructured metals
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DOI：
10.1016/j.msea.2003.10.214
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发表时间：
2004-07-15
期刊：
影响因子：
6.4
通讯作者：
Ma, E
中科院分区：
文献类型：
--
作者：
Wang, YM;Ma, E
本文综述了纳米和超细晶金属的应变硬化和应变速率硬化行为。总结了在我们实验室获得的实验结果，与一些最近的数据超细晶铜作为一个模型的情况下。由于应变硬化能力的降低和应变速率硬化不足，以不均匀和局部变形（例如颈缩和剪切带）形式的塑性不稳定性通常导致纳米结构和超细晶金属在室温（RT）下的低延展性。所观察到的晶粒尺寸的应变速率敏感性的依赖关系进行了讨论，其影响新的变形机制时，晶粒尺寸是在纳米晶（NC）和超细政权。(C)2003 Elsevier B.V.保留所有权利。
This paper presents an overview of the strain hardening and strain rate hardening behavior of nanostructured and ultrafine-grained metals. The experimental findings obtained in our laboratory are summarized, with some recent data for ultrafine-grained Cu presented as a model case. Due to the diminishing strain hardening capacity and inadequate strain rate hardening, plastic instabilities in the form of inhomogeneous and localized deformation such as necking and shear banding often contribute to the low ductility of nanostructured and ultrafine-grained metals at room temperature (RT). The observed grain size dependence of the strain rate sensitivity is also discussed in terms of its implications for new deformation mechanisms when the grain size is in the nanocrystalline (nc) and ultrafine regime. (C) 2003 Elsevier B.V. All rights reserved.