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The martensite structure and the characteristics of thermoelastic martensitic transformation in Fe-Co based ferromagnetic alloys

Larisa E. Kozlova 

Institute of Magnetism, NAS of Ukraine, 36-B Vernadsky str., Kiev 03142, Ukraine


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, Ms 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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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium E, by Larisa E. Kozlova
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-30 15:03
Revised:   2009-06-07 00:44