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J. Phys. IV France
Volume 05, Numéro C2, Février 1995
IIIrd European Symposium on Martensitic Transformations
Page(s) C2-175 - C2-180
IIIrd European Symposium on Martensitic Transformations

J. Phys. IV France 05 (1995) C2-175-C2-180

DOI: 10.1051/jp4:1995227

Effect of Ageing on the Martensitic Transformation in a Monocrystalline Cu-Al-Ni Shape Memory Alloy

V. Recarte1, M.L. Nó2 and J. San Juan1

1  Dpto. Física Mat. Condensada, Fac. Ciencias, Univ. Pais Vasco, Apdo 644, 48080 Bilbao, Spain
2  Dpto. Física Aplicada II, Fac. Ciencias, Univ. Pais Vasco, Apdo. 644, 48080 Bilbao, Spain

In this work we have studied the effect of post quench ageing on the martensitic transformation in a monocrystalline Cu-13,7Al-5Ni (wt.%) shape memory alloy. Internal friction and modulus change have been measured by an inverted torsion pendulum operating at 1 Hz for different ageing times. The results show a shift of the heating and cooling internal friction peaks towards high temperatures with the increase of the ageing time at 473 K. On the other hand, the quenched sample shows only one sharp peak on heating and cooling runs with low hysteresis transformation. Nevertheless, two separated internal friction peaks appears on heating as ageing time increases. The results can be attributed to a change in the thermally formed martensite from β1' in the quenched sample to a mixture of β1' and γ1' in the aged sample.

© EDP Sciences 1995