The results of investigations of stress-induced intermartensitic transformations in [012]-oriented Ni54Fe19Ga27 (at.%) single crystals are presented as a function of testing temperature and applied stresses. The sequence of intermartensitic transformations L21–14M–L10 at Т < 423 K is observed to change to L21–L10 at Т > 423 K. The interval of superelasticity development is controlled by the high value of α2–1 = dσcr/dT = 3.1 MPa/K and on the side of high temperatures is limited by the strength properties of the martensite phase; superelasticity is observed during L21–14M–L10-transformations below 353 K. It is experimentally found out that with increasing temperature and externally applied stresses the value of reversible transformation-induced strain is decreased, while the stress hysteresis is increased, and the interval of the forward transformation under loading becomes larger than that of the reverse.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 105–113, September, 2014.
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Timofeeva, E.E., Panchenko, E.Y., Chumlyakov, Y.I. et al. Intermartensitic Thermoelastic Transformations in [012]-Oriented Single Crystals of Ferromagnetic Nifega Alloys Under Compressive Loading. Russ Phys J 57, 1268–1277 (2015). https://doi.org/10.1007/s11182-015-0373-4
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DOI: https://doi.org/10.1007/s11182-015-0373-4