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The Effect of Hafnium and Thermal Cycling on the Transformation Temperatures of NiTi-Based Shape Memory Alloys

Published online by Cambridge University Press:  15 February 2011

Paul E. Thoma  and
John J. Boehm
Paul E. Thoma
Affiliation:
Johnson Controls, Inc., Corporate Technology, P.O. Box 591, Milwaukee, WI 53201-0591 USA
John J. Boehm
Affiliation:
Johnson Controls, Inc., Corporate Technology, P.O. Box 591, Milwaukee, WI 53201-0591 USA
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Abstract

The effect of thermal cycling on the austenite to martensite (A→M) and martensite to austenite (M→A) transformation temperatures (TTs) of Ni49.8Ti50.2 and Ni49.8Ti40.2Hf10 shape memory alloys is investigated. Test specimens are from arc melted buttons homogenized at 900°C for 100 hours. Results show that the A→M and M→A TTs for the alloys decrease with increasing number of thermal cycles through the phase transformations. The A→M TT of the NiTiHf alloy stabilizes more quickly than the A→M TT of the NiTi alloy when cycled. However, the M→A TT of the binary NiTi alloy stabilizes more quickly than the M→A TT of the NiTiHf alloy when cycled.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 604: Symposium LL – Materials for Smart Systems III , 1999 , 221
Copyright
Copyright © Materials Research Society 2000

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