Metastable Phases in Al₈₀Fe₁₀Ti₅Ni₅ Alloy Fabricated by Non-Equilibrium Processes

Abstract

In this study, the metastable phases that can be formed in Al₈₀Fe₁₀Ti₅Ni₅ alloy by melt spinning and mechanical alloying techniques have been investigated. The produced samples were examined by X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The results showed that the phases in Al₈₀Fe₁₀Ti₅Ni₅ alloy during rapid solidification are Al₁₃(Fe,Ni)₄, Al₃Ti and amorphous phases. The formation of equilibrium phases was completely suppressed by mechanical alloying. It is of note that supersaturated solid solution, decagonal, and amorphous phases are three separated phases that can be formed during mechanical alloying of an Al–10%Fe–5%Ni–5%Ti powder mixture.