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

  • L. Buffard (a1), P. Charbonnier (a1), C. Roucau (a2) and B. Dubois (a3)

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.

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[1] Wei, Z.G., Yang, D., Mater.Sci.Eng., A119, 145 (1989)
[2] Raymond, M., Weynant, E., Mass production of thermomarkers, MRS Symposium M, Boston, MA, 1991.
[3] Norme Francaise, Alliages a Mmomire de Forse, Vocabulaire et Mesures, NFA5l-080, Avril 1991.
[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.
[5] Rapacioli, R., Ahlers, M., Acta. Met., 27 777 (1978).
[6] Wu, M. H., Perkins, J., Wayman, C.M., Acta. Met., 37 n°7 1821, (1989).
[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.
[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. 24

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

  • L. Buffard (a1), P. Charbonnier (a1), C. Roucau (a2) and B. Dubois (a3)

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