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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Influence of heat treatments on phase composite and mechanical properties of Ni47Ti44Nb9 alloy
JIA Di(贾堤)1,2, LIU Wen-xi(刘文西)1 , DONG Zhi-zhong(董治中)1, HAN Ming(韩 明)1, WANG De-fa(王得法)1

1. College of Materials Science and Engineering,
Tianjin University, Tianjin 300072, China;
2. Department of Materials Engineering,
Tianjin Institute of Urban Construction, Tianjin 300384, China

Abstract:The influence of heat treatments on the phase composite and mechanical properties of Ni47Ti44Nb9 alloy were investigated by using XRD, SEM, TEM and EDX. The results show that a diffusional transformation takes place when the alloy is heated over 850℃ for a long time, and a new precipitation (Ni,Nb)3Ti with an hcp structure can be found. The formation of the precipitation leads to an increment of microhardness and reduction in elongation.

 

Key words: Ni-Ti-Nb alloy; heat treatment; precipitation; (Ni, Nb)3Ti

ISSN 1672-7029
CN 43-1423/U

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