Residual stress effect on hardness and yield strength of Ni thin film
Residual stress effect on hardness and yield strength of Ni thin film
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残余应力对镍薄膜硬度和屈服强度的影响
DOI：
10.1016/j.surfcoat.2012.07.002
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发表时间：
2012-08-25
影响因子：
5.4
通讯作者：
Lu, C.
中科院分区：
文献类型：
--
作者：
Ma, Z. S.;Zhou, Y. C.;Lu, C.
利用Berkovich压痕试验机研究了残余应力对镍薄膜塑性变形力学性能的影响。基于压痕尺寸效应的结果表明，在弹性变形阶段，残余应力对硬度几乎没有影响，而塑性变形对硬度的测量有显著影响。弹性模量和加工硬化指数与弹塑性变形无关，屈服强度的演化遵循加工硬化引起的镍薄膜的应力-应变曲线。提出了两个可以考虑残余应变对硬度和屈服强度影响的分析模型。皇冠版权所有(C)2012由爱思唯尔出版。保留所有权利。
Sharp indentation tests with a Berkovich indenter are utilized to investigate the influence of residual stress on the mechanical properties of Ni thin film subjected to plastic deformation. Based on the indention size effect, it is shown that residual stress has almost no influence on hardness in the elastic deformation stage while plastic deformation has a significant impact on the measurement of hardness. The elastic modulus and work hardening exponent are independent of elastic or plastic deformation and the evolution of yield strength follows the stress-strain curve of Ni thin film due to work hardening. Two analytical models are suggested in which the effect of residual strain on hardness and yield strength can be considered. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.