Properties of Al-Mg₂Si-oxide P/M Materials Processed by Mechanical Alloying

Abstract

With a purpose of obtaining light weight materials of high strength, powder mixture of aluminum and magnesium silicide (Mg₂Si) was mechanically alloyed with addition of oxide (Cr₂O₃, Fe₂O₃, MnO₂) powder. The mechanically alloyed powders were consolidated to the P/M materials by vacuum hot pressing and hot extrusion, and their structures and mechanical properties were examined and compared with hyper-eutectic Al-Si based P/M materials. All the P/M materials of Al-Mg₂Si-oxide showed high compressive strength above 900 MPa. Among them, the highest strength of 1090 MPa was obtained for Al-Mg₂Si-Fe₂O₃. Even the P/M material of Al-Mg₂Si without oxide addition showed compressive strength of 795 MPa. The Al-Mg₂Si based P/M materials showed higher compressive strength and higher ductility than hyper-eutectic Al-Si based P/M materials.