METHOD FOR PRODUCTION OF EXTRUSION BILLET, AND METHOD FOR PRODUCTION OF MAGNESIUM ALLOY MATERIAL

摘要

Disclosed is a method for producing an extrusion billet, which comprises the steps of: providing a plate-like or block-like starting material comprising a magnesium alloy; subjecting the starting material to the thermoplastic processing at a temperature of 250°C or lower and at a rolling reduction rate of 70% or more to introduce a strain into the material without causing dynamic recrystallization; milling the thermoplastic-processed material to produce a powdery material; and compressing the powdery material to produce a powder compact billet.