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J. Phys. IV France
Volume 05, Number C2, Février 1995
IIIrd European Symposium on Martensitic Transformations
Page(s) C2-349 - C2-354
IIIrd European Symposium on Martensitic Transformations

J. Phys. IV France 05 (1995) C2-349-C2-354

DOI: 10.1051/jp4:1995253

The Effect of Stress Ageing on the Properties of Shape Memory Alloys

A.D. Michael

Memory Metals Limited, 3 Penny Corner, Farthing Road, Ipswich, Suffolk IP1 5AP, England, U.K.

The performance characteristics of shape memory alloys operating in an overtemperature shut-off valve at a temperature of 95°C for up to 2000 hours are presented. Alloys of NiTi, Cu-Al-Ni and Cu-Zn-Al have been characterised under these ageing conditions. The effect of altering the processing parameters, viz solution treatment temperature, quenching technique and training procedure were examined. All alloys show degradation of the memory behaviour but results are presented which demonstrate that improvements in degradation can arise by altering the solution treatment temperature and training procedure.

© EDP Sciences 1995