Stress-induced martensitic phase transformation in thin sheets of Nitinol

被引:173
作者
Daly, S. [1 ]
Ravichandran, G. [1 ]
Bhattacharya, K. [1 ]
机构
[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA
基金
美国国家科学基金会;
关键词
phase transformation; shape-memory alloys; texture;
D O I
10.1016/j.actamat.2007.02.011
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Using the in situ optical technique known as digital image correlation (DIC), full-field quantitative strain maps of localization have been experimentally obtained for the first time in thin sheets of Nitinol. The use of DIC provides new information connecting previous observations on the micro- and macro-scales. It shows that the transformation initiates before the formation of localized bands, and the strain inside the bands does not saturate when they nucleate. The effect of rolling texture on the macroscopic stress-strain behavior was observed and it is shown that the resolved stress criterion or Clausius-Clapeyron relation does not hold for polycrystalline Nitinol. Finally, the effect of geometric defects on localization behavior was observed. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:3593 / 3600
页数:8
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