HIGH STRENGTH AND HIGH TOUGHNESS MAGNESIUM ALLOY AND METHOD FOR PRODUCTION THEREOF

摘要

[PROBLEMS] To provide a high strength and high toughness magnesium alloy which has a strength and a toughness both being at a level sufficient for the alloy to be practically used corresponding to the expanded application of a magnesium alloy and a method for producing the alloy. [MEANS FOR SOLVING PROBLEMS] A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium cast product containing a atomic % of Zn, b atomic % in total of at least one element selected from the group consisting of Dy, Ho and Er, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a plastically worked product, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.2 <= a <= 5.0 (2) 0.2 <= b <= 5.0 (3) 0.5a - 0.5 <= b.