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The Influence of the Microstructure of CU-ZN-AL Shape Memory Alloy on Mechanical Hysteresis

Published online by Cambridge University Press:  25 February 2011

L. Buffard
Affiliation:
IMAGX S.A., Athelia 1, batiment delta, 13600 LA CICTAT, France
P. Charbonnier
Affiliation:
IMAGX S.A., Athelia 1, batiment delta, 13600 LA CICTAT, France
C. Roucau
Affiliation:
C.N.R.S. C.E.M.E.S, 29 rue jeanne Marvig, 31055 TIUE CEEX, France
B. Dubois
Affiliation:
E.N.S.C.P., 11 rue P.M. Curie, 75231 PARIS CMEX 05, France
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Abstract

Cu-Zn-Al shape memory alloys may offer good thermomechanical properties for industrial applications. However, it is important to control transformation temperatures,the aging and the fatigue behaviour.

We compare in this paper the effects of two thermomechanical treatments on industrial springs:

“Direct” treatment consists in homogenization in β phase, annealing and training.

“Inverse” treatment consists in homogenization in β phase, training and annealing.

A correlation between electron microscopy observations and D.S.C. experiments shows that heterogeneous ordered state (β+y2+β3) in Cu25%wtZn9%wtAl is an essential parameter influencing mechanical hysteresis.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

[1] Wei, Z.G., Yang, D., Mater.Sci.Eng., A119, 145 (1989)CrossRefGoogle Scholar
[2] Raymond, M., Weynant, E., Mass production of thermomarkers, MRS Symposium M, Boston, MA, 1991.Google Scholar
[3] Norme Francaise, Alliages a Mmomire de Forse, Vocabulaire et Mesures, NFA5l-080, Avril 1991.Google Scholar
[4] Buffard, L., Charbonnier, P., Vincent, L., Weynant, E., Study of thermamechanioal treatments used for a CuZnAl industrial alloy, Proceedings of European Synlposèiirm on Martensitic Transformation and Shape Memory Properties, Aussois, (France), 1991, to be published.Google Scholar
[5] Rapacioli, R., Ahlers, M., Acta. Met., 27 777 (1978).CrossRefGoogle Scholar
[6] Wu, M. H., Perkins, J., Wayman, C.M., Acta. Met., 37 n°7 1821, (1989).Google Scholar
[7] Mingsheng, C., Xiaye, L., Proceedings of the international symposium on shape memory alloys, Guilin (China), 1986, p286, Edited by Youyi, C., China Academic Publishers.Google Scholar
[8] Buffard, L., Interaction des défauts, de l'ordre dèsordre et de la transformation martensitique sur 1' hysteresis mscanique d'un alliage A mnmoire de forme CuZnAL, Thesis, Ecole Centrale de Lyon, Lyon (France) - EYCL 90. 24Google Scholar

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