Texture development and strain hysteresis in a NiTi shape-memory alloy during thermal cycling under load

被引:41
作者
Ye, B. [2 ]
Majumdar, B. S. [1 ]
Dutta, I. [3 ]
机构
[1] New Mexico Inst Min & Technol, Dept Mat, Socorro, NM 87801 USA
[2] Northwestern Univ, Dept Mat, Evanston, IL 60208 USA
[3] Washington State Univ, Pullman, WA 99164 USA
关键词
Neutron diffraction; Martensitic transformation; Strain-pole map; Texture; NEUTRON-DIFFRACTION; MARTENSITIC-TRANSFORMATION; SUPERELASTIC NITI; IN-SITU; STRESS; POLYCRYSTALS; REFINEMENT;
D O I
10.1016/j.actamat.2009.01.032
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Thermal cycling experiments were conducted on a NiTi shape-memory alloy at different constant applied stresses below the yield strength of the martensite. The mechanical strain response manifested as strain hysteresis loops, whose range was proportional to the applied stress. In situ neutron diffraction experiments show that the strain hysteresis occurs as a result of the establishment of a stress-dependent crystallographic texture of the martensite during the first cool-down from austenite, and thereafter repeated during thermal cycling under the same load. This texture is found to depend on the stress during the thermal cycling experiments. A strain-pole map is derived and shown to explain the observed texture during thermal cycling. The strain-pole methodology is shown to work with similar martensitic transformations in other material systems. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:2403 / 2417
页数:15
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