Fatigue behaviour of Al-25Zn-3Cu alloy


Savaskan T. , Tan H. O.

MATERIALS SCIENCE AND TECHNOLOGY, vol.30, no.8, pp.938-943, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 8
  • Publication Date: 2014
  • Doi Number: 10.1179/1743284713y.0000000362
  • Title of Journal : MATERIALS SCIENCE AND TECHNOLOGY
  • Page Numbers: pp.938-943

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 alpha dendrites, eutectoid alpha + eta phases and theta 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.