J. Phys. IV France 122 (2004) 97-101
Comportement de l'austénite mère aux traitements lents au dessus de Af dans les alliages AMF à base de Cu-Al-NiM. Bouabdallah1, H. Cheniti1, N. Achour1 and G. Cizeron2
1 Laboratoire de Science et Génie des Matériaux, Département de Métallurgie, École Nationale Polytechnique, 10 Avenue Hassen Badi, Alger, Algérie
2 Laboratoire de Structure des Matériaux Métalliques, Université de paris-Sud, bâtiment 414, 91940 Orsay Cedex, France
On heating at temperature upper then Af and then cooled at room temperature, the initially quenched structure of the Cu - Al - Ni SMA changes significantly. These changes in the structure depend essentially of the heating speed and the maximal temperature reached. Consequently, the martensitic transformation temperatures rise up. In the present study, two modes of processing are applied on the alloy: a slow heating and cooling, and an isothermal treatment at 400 °C during several times and then cooled quickly to room temperature. The samples are observed by metallographic method and analyzed by XR diffraction. The mode of transformation of the parent phase b1 into the equilibrium phase is also determined.
© EDP Sciences 2004