Development of B2 Shape Memory Intermetallics Beyond NiAl, CoNiAl and CoNiGa
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The present study describes the development of shape memory alloys based on NiAl. Initially, this system was considered a promising but unsuccessful neighbour of NiTi. Later, however, shape memory alloys like CoNiAl or CoNiGa were developed that can be considered as NiAl derivatives and already demonstrated good mechanical properties. Yet, these alloys were still inferior to NiTi in most respects. Lately, using a multi-component approach, a CoNiCuAlGaIn high entropy intermetallic compound was developed from the NiAl prototype. This new alloy featured a B2 phase and a martensitic transformation along with a remarkable strength in the as-cast state. In the long-term, this new approach might led to a breakthrough for shape memory alloys in general.
KeywordsMartensitic transformation Crystal structure Intermetallics SMA Functional fatigue High entropy alloys
G.S. Firstov acknowledges support by the DAAD scholarship (91657703) in the frame of the scholarship program “Research Stays for University Academics and Scientists, 2017”. G. Gerstein and H.J. Maier acknowledge financial support by the German Research Foundation (Grant No. MA1175/79-1).
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