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Aging Effects in Ni-36% Al Shape Memory Alloy

Published online by Cambridge University Press:  25 February 2011

David R. Angst ,
Ming-Yuan Kao  and
Bryan L. McKinney
David R. Angst
Affiliation:
Johnson Controls Inc., P.O. Box 591, Milwaukee WI 53201-0591, USA
Ming-Yuan Kao
Affiliation:
Johnson Controls Inc., P.O. Box 591, Milwaukee WI 53201-0591, USA
Bryan L. McKinney
Affiliation:
Johnson Controls Inc., P.O. Box 591, Milwaukee WI 53201-0591, USA
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Abstract

Samples of Ni-36 at% Al which were hot rolled, then solutionized at 1230°C and quenched, exhibited reversible transformations between the low-temperature, martensitic phase and the high temperature, austenitic phase. The initial peak transformation temperatures on heating (AP), cooling (MP), and the heats of transformation (ΔH) determined by differential scanning calorimetry (DSC) were ∼121°C, 119°C and 4 J/g, respectively for the as-solutionized material.

Decreases in transformation temperatures and heats after aging at 350°C were also determined using differential scanning calorimetry (DSC), and microhardness testing (DPH). The DPH values plotted against age time showed two distinct peaks, a result similar to precipitation hardening in other Al alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 67
Copyright
Copyright © Materials Research Society 1992

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References

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