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Martensitic transformation and related properties of Fe69.4Pd30.6 ferromagnetic shape memory ribbons

F. TOLEA1, M. SOFRONIE1,*

Affiliation

  1. National Institute of Materials Physics, P.O. Box MG-7, 077125, Magurele-Bucharest, Romania

Abstract

Ferromagnetic shape memory alloys (FSMA) have attained strong interest over the last years and Fe-Pd alloys seems to be more suited for engineering and medical applications, due to their improved ductility and biocompatibility compared to the well-known Ni2MnGa alloy. The shape memory effect in disordered Fe–Pd (30 at.% Pd) is associated with FCC–FCT thermoelastic martensitic transformation. The melt–spinning technique enables to get ribbons with the FCC meta-stable structure preventing the precipitation of undesirable BCT irreversible phase and subsequent proper\ thermal treatments could improve the characteristic parameters of the martensitic transformation. The present work reports the effect of the rapid solidification (via melt-spinning technique) and the different thermal treatments on the microstructure, martensitic transformation and magnetic properties of the Fe69.4Pd30.6 ribbons. The samples were investigated by calorimetry, X-ray diffractometry, scanning electron microscopy and magnetometry. Two different structures induced by the distinct thermal treatments and responsible for the characteristic behavior of the martensitic transformation, were noticed and discussed in details. The high temperature treatment for short time stabilized the FCC phase and slightly decrease the martensitic transformation temperature, while the annealing at low temperature for longer time promotes the reduction of the amount of transforming FCC phase by its partial decomposition in the stable phases, causing the fall of the heat of transformation..

Keywords

Fe69.4Pd30.6 alloy, Ferromagnetic shape memory ribbons, Martensitic transformation, Magnetic properties.

Submitted at: May 24, 2018
Accepted at: Nov. 29, 2018

Citation

F. TOLEA, M. SOFRONIE, Martensitic transformation and related properties of Fe69.4Pd30.6 ferromagnetic shape memory ribbons, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 11-12, pp. 701-706 (2018)