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J. Phys. IV France
Volume 07, Numéro C5, November 1997
IVth European Symposium on Martensitic Transformations
Page(s) C5-305 - C5-310
IVth European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-305-C5-310

DOI: 10.1051/jp4:1997548

Low Temperature Ageing Behaviour of Quenched Cu-Al-Be Shape Memory Alloy

A. Planes1, Ll. Manosa1, M.A. Jurado1, R. Romero2 and A. Somoza1

1  Departament d'Estructura i Constituents de la Matèria, Facultat de Física, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Catalonia, Spain
2  IFIMAT, Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, 7000 Tandil, Argentina, and Comisión de Investigaciones Científicas de la Provincia de Bueno Aires, Argentina

Positron lifetime measurements are used to obtain the concentration of quenched-in point defects for different quenching temperatures and to determine their subsequent time evolution at room temperature. The corresponding evolution of the transition temperature after the quench has also been measured by calorimetry. The fact that both quantities follow comparable time evolutions corroborates the claim that vacancies are responsible for the observed changes in the martensitic transition properties after quenching.

© EDP Sciences 1997