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Heusler Type CoNiGa Alloys with High Martensitic Transformation Temperature
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Heusler Type CoNiGa Alloys with High Martensitic Transformation Temperature

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Abstract:

A strong need exists to develop new kinds of high-temperature shape-memory alloys. In this study, two series of CoNiGa alloys with different compositions have been studied to investigate their potentials as high-temperature shape-memory alloys, with regard to their microstructure, crystal structure, and martensitic transformation behavior. Optical observations and X-ray diffractions confirmed that single martensite phase was present for low cobalt samples, and dual phases containing martensite and γ phase were present for high cobalt samples. It was also found that CoNiGa alloys in this study exhibit austenitic transformation temperatures higher than 340°C, showing their great potentials for developing as high-temperature shape-memory alloys.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

2241-2244

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.2241

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Online since:

May 2007

Authors:

Yun Qing Ma, Cheng Bao Jiang, Yan Li, Cui Ping Wang, Xing Jun Liu

Keywords:

CoNiGa, Heusler Alloy, High-Temperature Shape Memory Alloy, Martensitic Transformation (MT)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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