J. Phys. III France
Volume 2, Numéro 5, May 1992
Page(s) 739 - 749
DOI: 10.1051/jp3:1992155
J. Phys. III France 2 (1992) 739-749

The crystal structure of thermally- and stress-induced Martensites in Ni 2MnGa single crystals

V. V. Martynov and V. V. Kokorin

Institute of Metal Physics, Academy of Sciences of Ukraine, Vernadskogo str. 36, 252680, Kiev-142, Ukraine

(Received 13 September 1991, accepted 30 January 1992)

Deformation behavior of Ni 2MnGa single crystals uniaxially loaded in compression and tension along the $\langle 100\rangle\,\beta_1$ and $\langle 110\rangle\,\beta_1$ axes were investigated. It was shown that three successive stress-induced structural transitions may be observed for specimens tensed along the $\langle 100\rangle\,\beta_1$ or compressed along the $\langle 110\rangle\,\beta_1$ direction, while only one transition was stress-induced in compression along the $\langle 100\rangle\,\beta_1$ axis. The crystal structure of stress-induced and thermal martensite was identified and related reversible deformation values for different loading geometry were estimated.

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