New Amorphous Alloys in Al–Si–Fe–Ni and Al–Si–Fe–Co Systems and Their Crystallization Behaviour

Abstract

An amorphous single phase was formed in wide composition ranges of rapidly solidified Al–Si–Fe–Ni and Al–Si–Fe–Co alloys. In comparison with Al–Si–Fe system, the composition range of the amorphous alloys is the widest in the Al–Si–Fe–Ni system and becomes narrower in the Al–Si–Fe–Co system in the direction of Fe concentration axis. The extension of the compositional range in the direction of the Si concentration axis leads to the formation of new amorphous alloys with high silicon concentrations: Si₄₅Al₃₁Fe₂₀Ni₄, Si₄₅Al₃₆Fe₁₅Ni₄ and Si₄₅Al₄₁Fe₁₀Co₄. The crystallized structure consists of fcc Al, cubic Si and some ternary compounds of AlFeSi, AlSiNi, AlFeNi and AlSiCo depending on their alloy compositions.