Study On The Effect Of The Raw Material Ce Purity On The Glass Forming Ability Of Ce-Ga(Al)-Cu Amorphous Alloys

The effect of the purity of raw material Ce upon the glass forming ability(GFA) of Ce-Ga(Al)-Cu amorphous alloys was studied through preparing the Ce-Ga(Al)-Cu alloys using different Ce with different purity. The results show that the GFA of the alloys is very sensitive to the Ce purity change, the GFA would greatly change even though the Ce purity changes a little. The GFA of the Ce-Ga(Al)-Cu alloys could be enhanced by using the low material which is different to other systems, and the biggest Ce-based alloy was fabricated by using the lowest purity Ce in this work. It is found that the GFA of the alloys prepared by different purity Ce correlates well with the resistance ability against crystalline, i. e. the high the crystallization temperature is, the well GFA is, which is ascertained by the XRD results of the alloys through different heat treatment. Five impurity elements (Al, Si, Fe, La, Zr) were introduced to the Ce-Ga-Cu alloy as microalloying elements to investigate the effect of the impurity elements in the raw material on the GFA of the alloys, it is found that all these elements would enhance the GFA to some content and Al, Si and Fe are ascertained to be majorly responsible for the GFA. Also it is found these impurity elements would enhance the resistance ability against crystallization through the investigation of the relationship between the GFA and the thermal parameters of Ce-Ga-Cu-M(M=Al, Si, Fe, La, Zr) alloys. In this work it is suggested that the combined effect of the impurity elements in the raw materials especially the effect of Al, Si and Fe with high content contributes to the GFA difference of the Ce-Ga(Al)-Cu alloys via enhancing the stability of the competed crystalline phases and the confusion of the alloy system.