Abstract
In the present study, Al–25Zn–3Cu alloy was prepared by permanent mould casting. Fatigue behaviour of the alloy was investigated using a rotating bending fatigue test machine after determining its microstructural features and mechanical properties. It was observed that as-cast microstructure of the Al–25Zn–3Cu alloy consisted of aluminium rich α dendrites, eutectoid α+η phases and θ particles. Homogenisation and T6 heat treatment removed the dendritic microstructure of the alloy and produced a large grained microstructure together with zinc rich precipitates. Both heat treatments increased the hardness and strengths of the alloy, but reduced its ductility. The Al–25Zn–3Cu alloy exhibited the lowest and the highest fatigue strengths in the as-cast and T6 heat treated conditions respectively. The fatigue strength of the Al–25Zn–3Cu alloy was found to be much greater than that of the Al–12Si alloy. It was observed that the fatigue behaviour of Al–25Zn–3Cu alloy can be expressed by the Basquin equation.
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