J. Phys. IV France
Volume 112, October 2003
Page(s) 939 - 942

J. Phys. IV France
112 (2003) 939
DOI: 10.1051/jp4:20031035

Stress-strain - Temperature behaviour for martensitic transformation in Ni-Mn-Ga single crystal compressed along <001 > and <110 > axes

J. Pons1, V.A. Chernenko2, E. Cesari1 and V.A. L'vov3

1  Departament de Fisica, Universitat de les Illes Balears, 07071 Palma de Mallorca, Spain
2  Institute of Magnetism, Vemadsky Str. 36-b, 03142 Kiev, Ukraine
3  Taras Shevchenko University, 03127 Kiev, Ukraine

The strain recovery upon heating pre-deformed martensite as well as the stress-strain behaviour in compression of parent phase of single crystalline Ni 49.4Mn 27.7Ga 22.9 alloy transforming martensitically at TM = 274 K has been studied as a function of temperature and different orientation of compression axes. The constructed critical stress to induce the martensite transformation vs temperature ( $\sigma_c-7$) phase diagrams can be represented by straight lines with slopes of -2.5 and -9.4 MPa/K in <001 > and <110 > directions, respectively, which are in a good agreement with the theoretically estimated values.

© EDP Sciences 2003