Superelasticity and shape memory effects in polycrystalline Ni-Mn-Ga microwires

被引：35

作者：

Qian, M. F. ^{[1
]}

Zhang, X. X. ^{[1
]}

Witherspoon, C. ^{[2
]}

Sun, J. F. ^{[1
]}

Muellner, P. ^{[2
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[2] Boise State Univ, Dept Mat Sci & Engn, Boise, ID 83725 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 577卷

基金：

美国国家科学基金会;

关键词：

Ni-Mn-Ga; Melt-extraction; Superelasticity; Shape memory effect; MAGNETIC-FIELD; STRAIN; MARTENSITE; BEHAVIOR;

D O I：

10.1016/j.jallcom.2011.10.117

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Non-stoichiometric Ni49.9Mn28.Ga-6(21.5) microwires with a diameter of 30-80 mu m and cellular grain size of 1-3 mu m were developed by melt-extraction. The superelasticity and shape memory effect of the microwires were investigated on a Dynamic Mechanical Analyzer (DMA Q800). The onset critical stresses for austenite to martensite transformation increase linearly with temperature and can be described by Clausius-Clapeyron relationship. The martensite to austenite transformation upon unloading only at temperatures at least 11 degrees C higher than the martensite start temperature. The as-extracted microwire was loaded in its martensite state to a strain of 2.7% without breaking and 92% plastic deformation strain recovers upon heating. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：S296 / S299

页数：4

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