Magnetic indication of the stress-induced martensitic transformation in ferromagnetic Ni–Mn–Ga alloy |
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| Authors: | O. Heczko,V.A. L&rsquo vov,L. Straka,S.-P. Hannula |
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| Affiliation: | 1. Laboratory of Materials Science, Helsinki University of Technology, Vuorimiehentie 2A, P.O. Box 6200, FIN-02015 TKK, Espoo, Finland;2. Radiophysics Department, Taras Shevchenko University, Glushkov str. 2, build. 5, 03022 Kiev, Ukraine;3. Laboratory of Biomedical Engineering, Helsinki University of Technology, Rakentajanaukio 2C, P.O. Box 2200, FIN-02015, Espoo, Finland |
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| Abstract: | A quantitative study of the stress-induced martensitic transformation in Ni49.7Mn29.1Ga21.2 magnetic shape memory alloy has been carried out in two different ways: the first way is based on the measurements of saturation magnetization under variable mechanical stress and the second one is founded on the quantitative theoretical treatment of experimental stress–strain loops. A functional dependence between the volume fraction of transformed martensite and applied stress has been determined from both magnetization and strain values. A quantitative agreement between the functions determined in two different ways has been observed, and hence, the effectiveness of the magnetic indication of the stress-induced martensitic transformations has been proved. This method can be used to monitor stress-induced transformations in martensitic films, needles and small specimens. |
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| Keywords: | Martensitic transformation Martensite Ferromagnetism Ni&ndash Mn&ndash Ga Stress-induced transformation |
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