MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy
Kodai NiitsuToshihiro OmoriRyosuke Kainuma
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2011 Volume 52 Issue 8 Pages 1713-1715

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Abstract

Superelasticity at temperatures between 77 K and 273 K in Cu-17Al-15Mn alloy was investigated. In this alloy, where no thermally-induced martensitic transformation appears, an excellent superelasticity with recovery strain of 8.5% was confirmed at 77 K. The critical stresses for stress-induced martensitic transformation decrease with decreasing temperature and its gradient becomes smaller at low temperatures due to the decrease of entropy change. The entropy change estimated at 77 K is −0.46 J/(mol·K), which is almost one-third of that at 221 K.

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© 2011 The Japan Institute of Metals and Materials
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