Micromechanics study of thermomechanical characteristics of polycrystal shape-memory alloy films

被引:10
|
作者
Jin, YM [1 ]
Weng, GJ [1 ]
机构
[1] Rutgers State Univ, Dept Mech & Aerosp Engn, New Brunswick, NJ 08903 USA
基金
美国国家科学基金会;
关键词
shape-memory alloy polycrystal films; martensitic transformation; thermomechanical characteristics; micromechanics;
D O I
10.1016/S0040-6090(00)01359-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper a relaxed self-consistent model is developed to calculate the evolution of martensite plates in the constituent grains and the overall behavior of the polycrystalline shape-memory alloy (SMA) films. This relaxed model was developed based on the observation that, for a thin film whose thickness direction contains only a few grains, the geometrical constraint in this direction is lost and consequently the non-vanishing components of the internal stress exist only in the plane directions. Such an internal stress distribution is used to calculate the martensitic volume concentration of the individual grains at the considered temperature, and then by means of an averaging process the overall properties of the polycrystal SMA film. Several important characteristics are uncovered based on this relaxed constraint; they show that the properties of thin films can be distinctly different from those of the bulks. Most notable among these under a thermally-induced phase transformation is a narrower range of transformation temperatures for the films. Under a mechanical loading the stress-strain behavior of the films are found to exhibit a lower 'work-hardening' characteristic than the bulks due to the relaxed geometrical constraint. (C) 2000 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:198 / 207
页数:10
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