HIGH-STRENGTH MAGNESIUM ALLOY WIRE AND METHOD FOR MANUFACTURING SAME, HIGH-STRENGTH MAGNESIUM ALLOY PRODUCT, AND HIGH-STRENGTH MAGNESIUM ALLOY SPRING

摘要

A high-strength magnesium alloy wire rod suitable for products in which at least one of bending stress and twisting stress primarily acts is provided. The wire rod has required elongation and 0.2 % proof stress, whereby strength and formability are superior, and has higher strength in the vicinity of the surface. In the wire rod, the surface portion has the highest hardness in a cross section of the wire rod, the highest hardness is 170 HV or more, and the inner portion has a 0.2 % proof stress of 550 MPa or more and an elongation of 5% or more.