Substitution effect on glass formation of NixCo60-xNb40 alloys

NixCo60-xNb40 alloys with different compositions (x=0, 15, 30, 45 and 60) were prepared by mechanical alloying, melt spinning and copper mold casting. X-ray diffraction indicates that all the samples prepared by mechanical alloying and melt spinning are amorphous, while the samples prepared by casting are crystalline. Thermal analysis of the amorphous NixCo60-xNb40 alloys reveals that their crystallization temperature increases with increasing Co content, while the heat of crystallization decreases with increasing amount of Co in the alloy.;NixCo60-xNb40 alloys with different compositions (x=0, 15, 30, 45 and 60) were prepared by mechanical alloying, melt spinning and copper mold casting. X-ray diffraction indicates that all the samples prepared by mechanical alloying and melt spinning are amorphous, while the samples prepared by casting are crystalline. Thermal analysis of the amorphous NixCo60-xNb40 alloys reveals that their crystallization temperature increases with increasing Co content, while the heat of crystallization decreases with increasing amount of Co in the alloy.