The Fe-Co-Ni-Ti alloy system belongs to the family ferromagnetic shape memory materials. Fe-Co-Ni-Ti alloys with different thermal hysteresis of martensite transformation have been studied by means of optical microscopy and X-ray diffraction at room and low temperatures. The characteristic temperatures of martensitic transformation were determined by the low-field magnetic susceptibility. The thermal hysteresis, M_s temperature, martensite tetragonality and transformation volume change have been measured for specimens with different time of aging. Correlations among these factors are discussed. The influence of thermocycling over a temperature range of γ↔α transformation on features of the latter in Fe-Co-Ni-Ti alloys was studied.

Keywords: Fe-Co-Ni-Ti alloy, ferromagnetic shape memory alloys, thermal hysteresis, thermocycling

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1. Martensitic transformation and magnetic properties in Fe-Co-based ferromagnetic shape memory alloys.