MAGNESIUM ALLOY MATERIAL

PROBLEM TO BE SOLVED: To provide a magnesium alloy material by which the broad or long material suitable for a raw material of a plastically processed material, or various-sized plastically processed materials can be produced with excellent productivity.SOLUTION: The magnesium alloy material is produced by joining a plurality of magnesium alloy pieces (typically alloy plates). The tensile strength and Vickers hardness at room temperature of each alloy piece are ≥165 MPa and ≥55 Hv, respectively, and the Vickers hardness Hv in the joint area composed of the magnesium alloy is equal to or higher than that of the alloy piece. Since the joint area has hardness equal to or higher than that of the alloy piece, the joint area hardly becomes a weak point mechanically in the magnesium alloy piece. Thereby, the magnesium alloy piece can be handled similarly to the broad or long material formed with uniform composition to be suitably used for the raw material of the plastically processed material. The alloy piece is preferably a rolled material obtained by rolling plural times, a cast material produced through a twin roll type continuous casting method; and friction-stir welding is preferably used for the above joining.