Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

F. G. BONIFACICH; O. A. LAMBRI; D. GARGICEVICH; G. I. ZELADA; J. I. PÉREZ-LANDAZÁBAL; V. RECARTE; V. SÁNCHEZ-ALARCOS

REVISTA MATéRIA

UNIV FED RIO DE JANEIRO

Año: 2018 vol. 23 p. 1 - 11

1517-7076

The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe70Pd30, it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformation temperature. In the present work, the influence of quenched-indefects upon the intensity and temperature of the thermoelastic martensitic (FCC-FCT) and the non thermoelastic (FCT-BCT) transitions in Fe-Pd doped with Co and Mn is studied. Differential scanning calorimetric and mechanical spectroscopy studies demonstrate that a reduction in the dislocation density the stability range of the FCC-FCT reversible transformation in Fe67Pd30Co3 and Fe66.8Pd30.7Mn2.5 ferromagnetic shape memory alloys.