WIT Press

Generation And Stability Of Reversible Shape Change In NiTi Memory Alloys

Price

Free (open access)

Paper DOI

10.2495/SM980261

Volume

38

Pages

10

Published

1998

Size

894 kb

Copyright

WIT Press

Author(s)

A.C. Kneissl & H. Scherngell

Abstract

Shape Memory Alloys (SMA) are promising materials for actuator components. This work focuses on the principal aspects underlying the deformation phenome- non known as Two-Way Shape Memory Effect (TWSME). On wire specimens of a near equiatomic NiTi alloy such an effect is achieved by a thermomechanical treatment. Depending on the training parameters and heat treatment conditions, different magnitudes of reversible shape change are obtained. Further experi- mental work concentrates on the stability of this special effect throughout cyclic application. Again a strong influence of the initial microstructure on the degrada- tion characteristic is observed. 1 Introduction The term shape memory refers to the ability of certain alloys

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