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Numéro
J. Phys. IV France
Volume 01, Numéro C4, Novembre 1991
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES
Page(s) C4-403 - C4-408
DOI http://dx.doi.org/10.1051/jp4:1991460
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES

J. Phys. IV France 01 (1991) C4-403-C4-408

DOI: 10.1051/jp4:1991460

TRAINING AND THE TWO WAY MEMORY EFFECT IN COPPER BASED SHAPE MEMORY ALLOYS

R. STALMANS, J. van HUMBEECK and L. DELAEY

Department of Metallurgy and Materials Engineering Katholieke Universiteit Leuven, De Croylaan 2, B-3001 Heverlee, Belgium


Abstract
Experimental results giving information about the mechanisms of the two way memory effect are presented. It is shown that local martensite stabilization and true plastic deformations have to be considered as undesirable side-effects of training. The experimental results also indicate that the macroscopic two way memory behaviour is, on a microstructural level, associated with a reproducible and stable martensite formation path. The higher the amount of transformation cycles the better becomes the stability and reproducibility. In accordance with the stable path is that the two way memory effect can withstand considerable forces during the forward transformation (the two way memory can do work during cooling). Another consequence is that the maximum attainable two way memory diminishes when the training procedure is preceded by thermal transformation cycles.



© EDP Sciences 1991