Influence of aging on phase transformation and microstructure of Ni50.3Ti29.7Hf20 high temperature shape memory alloy

被引：20

作者：

Prasher, Meenu ^{[1
]}

Sen, Debasis ^{[2
]}

机构：

[1] Bhabha Atom Res Ctr, Glass & Adv Mat Div, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 615卷

关键词：

Shape memory; Martensitic phase transformation; Precipitation; Transmission electron microscopy; Small-angle scattering; Hardness; ANGLE NEUTRON-SCATTERING; BEHAVIOR;

D O I：

10.1016/j.jallcom.2014.06.109

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：

We report the effect of aging on phase transformation temperature and mechanical strength of Ni50.3Ti29.7Hf20 high temperature shape memory alloy. Aging of the alloy at 550 degrees C and 650 degrees C increases the martensite phase transformation temperature. Transmission Electron Microscopy and quantitative investigation of microstructure by small-angle scattering confirm the improved hardness of the alloy on aging. Aging at 550 degrees C results in significant volume fraction of fine Ni-rich precipitates. Further, aging at 650 degrees C gives rise to coarsening of the precipitates vis-a-vis reduction in hardness. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：469 / 474

页数：6

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