Alloy Design for Fe-Ni-Co-Al-based Superelastic Alloys. (2015)

• Record Type: Journal Article
• Authors: Tanaka, Y.; Kainuma, R.; Omori, T.; Ishida, K.
• Is Part Of: Materials today. Volume 2(2015)Supplement 3
• Page Start: S485
• Page End: S492
• Publication Date: 2015
• Subjects: shape memory alloy -- superelastic alloy -- iron-based alloy -- martensitic transformation temperature -- γ' phase; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2015.07.333
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The γ' solvus temperature, the microhardness and the martensitic transformation temperatures were examined for the Fe-Ni-Co-Al-based shape memory alloys. It was found that Fe-28Ni-17Co-11.5Al-2X (X=Ti, Nb and Ta) alloys have a relatively high γ' solvus temperature and that they show high hardness when aged at 600 °C, especially in the case of Ta alloys. Alloy compositions to obtain a high hardness, a small transformation hysteresis and complete reversible transformation were evaluated as being Ni>28%, Co>13%, Al>10% and Ta>2.5%, and the most suitable aging temperature was 600 °C. Grain boundary precipitation of the NiAl-B2 phase was found to be suppressed by the addition of over 0.03 at.% boron.