High-Strength and High-Toughness magnesium Based Alloy, Driving System Part Using the Same and Manufacturing Method of High-Strength and High-Toughness magnesium Based Alloy Material

摘要

A high-strength and high-toughness magnesium based alloy contains, by weight, 1 to 8% rare earth element and 1 to 6% calcium and the maximum crystal grain diameter of magnesium constituting a matrix is not more than 30 mum. At least one intermetallic compound ( 6 ) of rare earth element and calcium has a maximum grain diameter of 20 mum or less and it is dispersed in a crystal grain boundary ( 5 ) and a crystal grain ( 4 ) of magnesium of the matrix.