Myths and Truths of Nitinol Mechanics: Elasticity and Tension–Compression Asymmetry

被引：38
作者：
Bucsek A.N. [1 ]
Paranjape H.M. [1 ]
Stebner A.P. [1 ]
机构：
[1] Department of Mechanical Engineering, Colorado School of Mines, Golden, 80401, CO
来源：
Shape Memory and Superelasticity | 2016年 / 2卷 / 03期
基金：
美国国家科学基金会;
关键词：
Anisotropy; Nickel–titanium; Shape memory alloy; Texture;
D O I：
10.1007/s40830-016-0074-z
中图分类号：
学科分类号：
摘要：
Two prevalent myths of Nitinol mechanics are examined: (1) Martensite is more compliant than austenite; (2) Texture-free Nitinol polycrystals do not exhibit tension–compression asymmetry. By reviewing existing literature, the following truths are revealed: (1) Martensite crystals may be more compliant, equally stiff, or stiffer than austenite crystals, depending on the orientation of the applied load. The Young’s Modulus of polycrystalline Nitinol is not a fixed number—it changes with both processing and in operando deformations. Nitinol martensite prefers to behave stiffer under compressive loads and more compliant under tensile loads. (2) Inelastic Nitinol martensite deformation in and of itself is asymmetric, even for texture-free polycrystals. Texture-free Nitinol polycrystals also exhibit tension–compression transformation asymmetry. © 2016, ASM International.
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页码：264 / 271
页数：7
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