J. Phys. IV France 05 (1995) C2-165-C2-170
An Experimental Study of the Coupling Between the Order-Disorder Transition and the Martensitic Transformation in Cu-Al-Be Shape Memory AlloysM. Jurado1, L. Mañosa1, A. Planes1 and C. Stassis2
1 Departament E.C.M., Facultat de Física, Diagonal 647, E-08028 Barcelona, Catalonia, Spain
2 Ames Laboratory, U.S. DOE and Department of Physics and Astronomy Iowa State University, Ames, IA 50011, U.S.A.
Order-disorder transitions in Cu-Al-Be alloys have been studied by means of X-ray diffraction measurements. Assuming that different ordered degrees can be "frozen" with suitable heat treatments, their effect on the martensitic transformation has been analized by microcalorimetry. The results indicate a change in the temperature of the martensitic transformation directly related to the change of the order degree : disordering stabilizes the martensite phase. Other effects observed after specific heat treatments have been associated to the vacancies retained after the quench. Additional elastic neutron scattering experiments provide data to fit the temperature changes to a previous proposed model.
© EDP Sciences 1995