Crystallization studies on amorphous Al-Y-Ni and AI-Y-Cu alloys

Abstract

Al₈₃Y₁₀Ni₇, Al₈₀Y₁₀Ni₁₀ and Al₈₀Y₁₀Cu₁₀ alloys were studied by the rapid solidification processing route. The glass-forming ability was found to decrease in the order of alloys mentioned above. Differential scanning calorimetry (DSC) of these amorphous alloys showed that the amorphous phase in Al-Y-Ni alloys has a higher thermal stability when compared to that in Al-Y-Cu alloys. A four-stage crystallization sequence could be identified for the Al-Y-Ni amorphous alloys. Even though the Al₈₀Y₁₀Cu₁₀ alloy showed four exothermic peaks in the DSC study, a definite crystallization sequence could not be arrived at due to the coexistence of many crystalline phases along with the amorphous phase in the melt-spun condition.