Load-biased shape-memory and superelastic properties of a precipitation strengthened high-temperature Ni50.3Ti29.7Hf20 alloy

被引：160

作者：

Bigelow, G. S. ^{[1
]}

Garg, A. ^{[1
,2
]}

Padula, S. A., II ^{[1
]}

Gaydosh, D. J. ^{[1
,3
]}

Noebe, R. D. ^{[1
]}

机构：

[1] NASA, Struct & Mat Div, Glenn Res Ctr, Cleveland, OH 44109 USA

[2] Univ Toledo, Toledo, OH 43606 USA

[3] Ohio Aerosp Inst, Cleveland, OH 44142 USA

来源：

SCRIPTA MATERIALIA | 2011年 / 64卷 / 08期

关键词：

Shape memory alloys; Martensitic phase transformation; Precipitation; Tension test; Transformation strain; TRANSFORMATION;

D O I：

10.1016/j.scriptamat.2010.12.028

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A slightly Ni-rich NiTi-20Hf (at.%) alloy was aged for 3 h at 550 degrees C to form a homogeneous distribution of 10-20 nm precipitates. To determine the effect of such structures on the martensite-austenite transformation, preliminary load-biased shape-memory and superelastic properties were measured. The alloy exhibited reasonably high transformation temperatures, near-perfect dimensional stability and a work output as high as 18.7 J cm(-3) during load-biased thermal cycling. Isothermal stress cycling of the austenite between 180 and 220 degrees C resulted in near-perfect superelastic behavior up to 3% applied strain. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：725 / 728

页数：4

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