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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.52  No.8 (2011)  >  pp.1713-1715

MATERIALS TRANSACTIONS
<<Previous article Vol.52  No.8 (2011)   pp.1713 - 1715 Next article>>

Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy

Kodai Niitsu1), Toshihiro Omori1) and Ryosuke Kainuma1)
1) Department of Materials Science, Graduate School of Engineering, Tohoku University

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.


Keyword:
martensitic phase transformation, shape memory alloy, copper alloys, heusler phases, superelasticity

Received: April 25, 2011
Accepted: May 23, 2011 , Published online: July 25, 2011
Copyright (c) 2011 The Japan Institute of Metals

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