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Shape Memory Properties of an Iron Modified Nickel Aluminide Alloy

Published online by Cambridge University Press:  16 February 2011

J. A. Horton ,
C. T. Liu  and
E. P. George
J. A. Horton
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, TN 37830-6115
C. T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, TN 37830-6115
E. P. George
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, TN 37830-6115
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Abstract

The ordered intermetallic NiAl with aluminum levels near 36% undergoes a B2 to martensite transformation. Shape memory alloys based on NiAl+Fe have the potential for transition temperatures of greater than 150°C. While binary alloys appear inherently brittle, alloying with iron and boron results in two phase alloys with L12 and B2 phases and with about 7% room temperature tensile ductility. These alloys show a two-way shape memory effect over a range of transition temperatures with austenite peak temperature, Ap, between 100 to 200'C based on composition. Unfortunately, the B2 phase and its low temperature body centered tetragonal martensitic form are not stable and both can transform to Ni5Al3 with a loss in ductility. These alloys with a constant tensile load show a two way shape recovery of up to 0.6% during temperature cycling between 100 and 200°C. A thorough survey of the shape memory properties of one such alloy with a composition of Ni-25.5 Al-16 Fe-0. 12 B (at.%) as a function of prior cold work, tensile loading and other training steps is presented. Nanoindentation was used to independently measure the mechanical properties of the two phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 549
Copyright
Copyright © Materials Research Society 1995

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