P/M materials from rapidly solidified flakes of AZ91 based magnesium alloys.

Abstract

Rapidly solidified flakes of AZ91 magnesium based alloys with or without addition of Si, Ni, Ce were produced by atomizing the alloy melt and subsequent splat quenching onto a water-cooled copper roll. Consolidation of the flakes was carried out by cold pressing and hot extrusion at a reduction ratio of 25:1. Higher tensile strength at room temperature was obtained for as-extruded materials than for T6-treated ones due to softening observed during solutionizing heat treatment. The as-extruded material of Si-bearing alloy showed the highest tensile strength of 371MPa.