Crystallization and magnetic properties of Fe40Co40Cu0.5Al2Zr9Si4B4.5 and Fe62Co9.5Gd3.5Si10B15 amorphous alloys

Abstract

Amorphous alloys with compositions Fe40Co40Cu0.5Al2Zr9Si4B4.5 and Fe62Co9.5Gd3.5Si10B15, were prepared by the melt spinning technique in the form of ribbons. Three stages of crystallization process were found in both the alloys and the crystallization kinetics was studied. Supper cooled region was found in Fe62Co9.5Gd3.5Si10B15 alloy indicating the ability of formation of bulk amorphous alloy and I mm diameter rod was prepared by Cu-mould casting. Curie temperature and the saturation magnetisation of this alloy were found to be 596 K and 0.98 T respectively. Relatively, higher Curie temperature (736 K) and saturation megnetisation (1.18 T) were observed in the as-spun state of Fe40Co40Cu0.5Al2Zr9Si4B4.5 alloy. Present study also indicated that partial crystallization of Fe40Co40Cu0.5Al2Zr9Si4B4.5 alloy would further enhance the Curie temperature and saturation magnetisation.