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High Temperature Shape Memory Alloys of Ni-Al Base Systems

Published online by Cambridge University Press:  25 February 2011

R. Kainuma ,
H. Nakano ,
K. Oikawa ,
K. Ishida  and
T. Nishizawa
R. Kainuma
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
H. Nakano
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
K. Oikawa
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
K. Ishida
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
T. Nishizawa
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
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Abstract

An attempt to develop a new type of high temperature shape memory alloys based on the Ni-Al system has been made through microstructural control. Addition of Fe or Mn to the binary Ni-Al alloy results in the formation of a ductile fcc phase in an extremely brittle P matrix phase, leading to an improvement in its ductility. These ductile alloys with β + γ two-phase structure in the Ni-Al-Fe, Ni-Al-Mn and Ni-Al-Mn-Fe systems exhibit a shape memory effect due to a thermoelastic martensitic transformation in the temperature range between -100°C and 700°C; besides, the transformation temperatures are easily controlled by annealing at an appropriate temperature. These alloys are expected to be a new group of shape memory alloys which operate at elevated temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 403
Copyright
Copyright © Materials Research Society 1992

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