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Stress-induced phase transformations in Ni–Mn–Ga alloys: experiments and modelling

✍ Scribed by L Hirsinger; N Creton; C Lexcellent

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
174 KB
Volume
378
Category
Article
ISSN
0921-5093

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✦ Synopsis

Ni-Mn-Ga ferromagnetic shape memory alloys (FSMA) appear to be very promising active materials because they exhibit giant and fast strains. In this paper, a study of the martensitic transformation is proposed. The pseudoelastic behaviour under pure compression of a Ni 49.7 Mn 27.7 Ga 22.9 single crystal previously measured for five different external temperatures (more than Ms 0 ) by Pons et al. [Proceedings of ICOMAT 02, J. Phys. IV, in press]-compression axes of the initial cubic austenitic phase are 0 0 1 and 1 1 0 -is compared to a model for ferromagnetic shape memory alloy pseudoelastic behaviour. The identification of model parameters permits to fit well the experimental results. Moreover a prediction of initiation surface of phase transformation (austenite → martensite) is proposed for Ni-Mn-Ga polycrystals under biaxial mechanical loadings.

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