The effect of cobalt element addition on the characteristics of equiatomic NiTi shape memory alloy

The influence of cobalt addition on the transformation temperatures, microstructure, and micro-hardness of equiatomic NiTi shape memory alloy was studied. The alloys composition was (50 % at. Ni, 50% at. Ti) and (43.45 % at. Ni, 54.728 % at. Ti and Co 1.815 % at.). Vacuum induction melting method is...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-11, Vol.1660 (1), p.12038
Main Authors: Mohammed, Safa H., Aljubouri, Ali A., Mohammed, Mudhafer A.
Format: Article
Language:English
Subjects:
DSC
equiatomic NiTi alloy
NiTiCo alloy
shape memory alloys
Ti2Ni phase
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Summary:The influence of cobalt addition on the transformation temperatures, microstructure, and micro-hardness of equiatomic NiTi shape memory alloy was studied. The alloys composition was (50 % at. Ni, 50% at. Ti) and (43.45 % at. Ni, 54.728 % at. Ti and Co 1.815 % at.). Vacuum induction melting method is used to produce the shape memory alloys. The investigation of the characteristics of the samples was carried out using, scanning electron microscope conducted with energy dispersive X- ray spectrometer, differential scanning calorimeter, x-ray diffraction measurement and vickers micro-hardness testing. The results show the microstructure of two alloys contain Ti2Ni precipitate phase, the martensite phase layers increase with cobalt addition. The micro-hardness increased, the austenite starts temperature and austenite finish temperature decreases, and thermal hysteresis becomes narrower, after adding a small amount of cobalt.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1660/1/012038