HIGH TOUGHNESS MAGNESIUM-BASE ALLOY, DRIVE COMPONENT USING SAME, AND METHOD FOR PRODUCING HIGH TOU

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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 µ m. At least one intermetallic compound (6) of rare earth element and calcium has a maximum grain diameter of 20 µ m or less and it is dispersed in a crystal grain boundary (5) and a crystal grain (4) of magnesium of the matrix.