Martensitic Transformation in Ni-Al-Pt High Temperature Shape Memory Alloys

Abstract:

In alloys Ni–39(41)Al–xPt (x = 5,10,15,20 at.%) the alloying by Pt strongly increases the Ms point. There is no direct proportionality between the Pt content and the Ms point increasing. No traces of Ni3Al were found in the alloys. The precipitation of Ni₅Al₃ was observed in Ni–39Al–15Pt alloy after cycling through the temperature range between the room temperature and 800°C. The effect of Pt alloying on the martensitic transformation and high temperature martensitic transformation stability is governed by the competition between the martensitic transformation and formation of the Ni₅Al₃ phase upon the cooling. Pt addition, instead of Ni, can resolve the problem of decomposition processes because the alloy composition is shifted out of the Ni₃Al domain on the phase diagram and it reduces the influence of the Ni₅Al₃ phase on the degradation of martensitic transformation.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 506-511
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.506
• Online since: January 2013
• Authors: Gennady E. Monastyrsky, Patrick Ochin, Valery V. Odnosum, Alexander Yu. Pasko, Victor I. Kolomytsev, Yuri Koval
• Keywords: High Temperature Shape Memory Alloys, Ni₅Al₃ Phase, Pt-Modified Ni-Al Alloys

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