High strength and high toughness magnesium alloy and method of producing the same
OwnerYoshihito Kawamura, Michiaki Yamasakiinventors
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Abstract
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 alloy cast product containing a atomic % of Zn, b atomic % of Y, 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 preliminary plastically worked product, and subjecting the preliminary plastically worked product to a heat treatment, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.5≤a<5.0 (2) 0.5<b<5.0 (3) ⅔a−⅚≤b.
Claims7
A method of producing a high strength and high toughness magnesium alloy comprising:
- preparing a magnesium alloy casting product comprising “a” atomic % of Zn, “b” atomic % of Y and a residue of Mg, wherein “a” and “b” satisfy the following expressions (1) to (3),
- (1) 0.5≤a≤5.0;
- (2) 0.5<b<5.0;
- and
- (3) ⅔a−⅚≤b,
- casting the magnesium alloy casting product having a cooling rate at the casting of 1000K/second or less, and
- producing a plastically worked product by subjecting the magnesium alloy casting product to plastic working, wherein an amount of strain per one working is 0.002 to 4.6 and a total amount of strain is 1.15 or more and 15 or less;
- to obtain the high strength and high toughness magnesium alloy having a hcp structured magnesium phase, a long period stacking ordered structure phase, and at least one precipitate selected from the group consisting of a compound of Mg and rare-earth element, a compound of Mg and Zn, a compound of Zn and rare-earth element and a compound of Mg, Zn and rare-earth element.
Dependencies are inferred from the claim text.