Tensile shape memory behavior of Ni50.3Ti29.7Hf20 high temperature shape memory alloys

被引：64

作者：

Saghaian, S. M. ^{[1
]}

Karaca, H. E. ^{[1
]}

Souri, M. ^{[1
]}

Turabi, A. S. ^{[1
]}

Noebe, R. D. ^{[2
]}

机构：

[1] Univ Kentucky, Dept Mech Engn, Lexington, KY 40506 USA

[2] NASA, Glenn Res Ctr, Mat & Struct Div, Cleveland, OH USA

来源：

MATERIALS & DESIGN | 2016年 / 101卷

关键词：

Shape memory alloys; NiTiHf; Tensile testing; Heat treatments; INDUCED MARTENSITIC-TRANSFORMATION; COMPRESSION ASYMMETRY; PSEUDOELASTIC NITI; DAMPING CAPACITY; SINGLE-CRYSTAL; STRESS;

D O I：

10.1016/j.matdes.2016.03.163

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of heat treatment on the shape memory characteristics of a polycrystalline Ni50.3Ti29.7Hf20 alloy were studied via thermal cycling under stress and isothermal stress cycling experiments in tension. It was revealed that transformation temperatures could be increased above 100 degrees C with aging at temperature above 500 degrees C and in particular were stabilized against stress-free thermal cycling after aging at 500 degrees C. Recoverable strain of similar to 5% was observed for the as-extruded samples and decreased to similar to 4% after aging due to the formation of non-transformable precipitates. The aged alloys demonstrated near perfect shape memory effect under tensile stresses as high as 700 MPa and perfect superelasticity at temperatures up to 230 degrees C. Finally, the tension-compression asymmetry observed in NiTiHf alloys was discussed. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：340 / 345

页数：6

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