Tensile behaviours of equal channel angular pressed Al–11·5Zn–2Mg–1·5Cu–0·2Sc–0·15Zr alloy fabricated by spray forming at ambient and elevated temperatures

Abstract

Tensile behaviours at ambient and elevated temperatures of an equal channel angular pressed ultrahigh strength Al–11·5Zn–2Mg–0·2Cu–0·2Sc–0·15Zr alloy fabricated by spray forming were investigated in the present paper. At ambient temperature, the equal channel angular pressed materials through route A exhibit moderate strength, lower than that of as extruded material but higher than that of extruded one followed by annealing. Increasing equal channel angular pressing pass has no effect on strength but decreases the elongation. At elevated temperature (300°C), tensile strength decreases significantly, and ductility increases dramatically with decreased strain rate. At a strain rate of 5×10⁻⁴ s⁻¹, an elongation to failure of 241 and a strain rate sensitivity of 0·32 were obtained.