Abstract
Rapidly solidified powders of Al-10 mass% Mg based alloys with or without additions of 1, 5 or 10 mass% Si were produced by atomizing and subsequent splat quenching on a water-cooled copper roll. Consolidation of the powders was done by cold pressing, vacuum degassing and hot extrusion (P/M materials). The microstructures of as-extruded P/M materials contained fine scale of intermetallic compounds. The size of the compounds in the Al-10Mg-1Si alloy was finer than that in the other alloys. The alloys containing excess Mg to the Mg2Si composition showed higher hardness and tensile strength than those containing excess Si to the Mg2Si composition at room temperature. Al-10Mg-1Si and Al-10Mg-10Si P/M materials showed the highest tensile strength of 480 MPa at room temperature and 140 MPa at 573 K, respectively.
