THE STUDY OF CONSTITUTIONAL PHASES IN A NI47TI44NB9 SHAPE MEMORY ALLOY

被引：56
作者：
ZHANG, CS
WANG, YQ
CHAI, W
ZHAO, LC
机构：
[1] Department of Metals and Technology, Harbin Institute of Technology
来源：
MATERIALS CHEMISTRY AND PHYSICS | 1991年 / 28卷 / 01期
关键词：
D O I：
10.1016/0254-0584(91)90051-U
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The constitutional phases and microstructure of Ni47Ti44Nb9 alloy have been studied by means of optical microscopy, electron probe X-ray microanalyses (EPMA) and X-ray diffraction. It has been shown that the microstructure of the experimental alloy consists of three phases: TiNi matrix, niobium-rich phase and Ti3(Ni, Nb)2 compound. The Nb-rich phase is determined to be beta-Nb with hcc structure containing a small amount of Ni and Ti. The beta-Nb is a soft phase which forms a eutectic structure with TiNi phase during solidification. After hot working the soft beta-Nb phase is dispersed in TiNi matrix and gives rise to a wide transformation hysteresis in the alloy. The Ti3(Ni,Nb)2 is a harder and embrittlemental phase.
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页码：43 / 50
页数：8
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