On plasticity and fracture of nano structured Cu/X (X = Au, Cr) multilayers: The effects of length scale and interface/boundary
On plasticity and fracture of nano structured Cu/X (X = Au, Cr) multilayers: The effects of length scale and interface/boundary
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纳米结构 Cu/X (X = Au, Cr) 多层膜的塑性和断裂：长度尺度和界面/边界的影响
DOI：
10.1016/j.actamat.2010.03.042
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发表时间：
2010-06-01
期刊：
影响因子：
9.4
通讯作者：
Zhang, G. P.
中科院分区：
文献类型：
--
作者：
Li, Y. P.;Zhang, G. P.
通过三点弯曲实验研究了两种不同类型的Cu/X（X = Au，Cr）多层膜在拉伸应力作用下的塑性变形和断裂行为。结果表明，复合材料的塑性变形能力和断裂方式取决于复合材料的层厚和界面/边界。Cu/Au多层膜在断裂前表现出明显的塑性流动特征，随着层厚的减小，这种塑性逐渐被层界面过早的不稳定剪切所抑制。相比之下，Cu/Cr多层膜容易随着层厚度的减小而发生准脆性正常断裂。实验观察和理论分析都揭示了两种金属多层膜的塑性和断裂模式的差异以及由于长度尺度约束和位错运动的界面/边界阻挡而引起的相关物理机制的转变。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Plastic deformation and fracture behavior of two different types of Cu/X (X = Au, Cr) multilayers subjected to tensile stress were investigated via three-point bending experiments. It was found that the plastic deformation ability and fracture mode depended on layer thickness and interface/boundary. The Cu/Au multilayer showed significant features of plastic flow before fracture, and such plasticity was gradually suppressed by premature unstable shearing across the layer interface with decreasing layer thickness. In comparison, Cu/Cr multilayers were prone to a quasi-brittle normal fracture with decreasing layer thickness. Both experimental observations and theoretical analyses revealed differences in plasticity and fracture mode between the two types of metallic multilayers and the relevant physical mechanism transition due to length scale constraint and interface/boundary blocking of dislocation motion. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.