Properties of Co-Alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys
It is experimentally found that in the Ni54Fe20-x Cox Ga26 ferromagnetic shape memory alloys, Co variation from 0 to 9 at.% leads to: (i) almost linear change of martensitic transformation temperatures from −70 °C to 120 °C; (ii) a non-monotonous change of the Curie temperature, and (iii) a linear decrease of saturation magnetization from 60 to 43 Am2/kg. The selected alloys grown as single crystals have been (magneto-) mechanically tested. The superelastic effect has been measured to be about 4%. The magneto-strain shows a training effect which is an evidence of the effect of magnetic-field-induced twin-boundary motion.
V. A. Chernenko, K. Oikawa, M. Chmielus, S. Besseghini, E. Villa, F. Albertini, L. Righi, A. Paoluzi, Peter Mullner, R. Kainuma, and K. Ishida. "Properties of Co-Alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys" Journal of Materials Engineering and Performance 18.5-6 (2009): 548-553.