Solid recycling process for magnesium alloys

抄録

We have proposed the “Solid Recycling Process” as a new recycling process for magnesium alloys scraps. In the new process, recycled materials can be fabricated by extruding the scraps without melting. In this research, AZ91D magnesium alloy scraps by thixo-molding process were recycled by this process and mechanical and corrosion properties of the recycled materials were investigated. Chemical compositions of the solid recycled specimen were in agreement with those of the Japanese Industrial Standard of AZ91D and the contamination levels were low. The solid recycled specimens showed higher strength and larger elongation than the virgin ingot specimen at room temperature. The feature of the solid recycling process is improvement of mechanical properties by recycling. The improvement of mechanical properties is attributed to grain refinement by hot extrusion. Mass loss of the solid recycled specimen after 72 hour in 3mass% NaCl solution was about 1.5×10^-2kg/m² which was comparable with that of the virgin ingot specimen.