Magnesium alloy and production method thereof
AssigneeMG Port Inc.
InventorsYoshihito Kawamura, Shinichi Inoue
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Abstract
Provided is a magnesium alloy having a thermal conductivity of 75 W/m·K or more and a high specific strength. One aspect of the present invention is a magnesium alloy containing a at. % of Al, b at. % of Ca, c at. % of Mn, and d at. % of D, with the remainder comprising Mg and unavoidable impurities. D has at least one of a rare-earth element (RE), Sn, Li, Zn, Ag, Be and Sc. The magnesium alloy does not contain Si and Sr. C mentioned above satisfies expression 1 below, d satisfies expression 2 below, and a and b are within a range enclosed by the solid line shown in FIG. 1. The thermal conductivity is 75 W/m·K or greater. (Expression 1) 0≤c≤0.1; (Expression 2) 0≤d≤1.
Claims2
A magnesium alloy:
- comprising A element in an amount of “a” atomic %, B element in an amount of “b” atomic %,
- and a balance of Mg and unavoidable impurities,
- wherein the A element is Al,
- wherein the B element is Ca,
- wherein “a” and “b” are within a range bounded by straight lines represented by (1) to (4) below in coordinates (b, a) with “b” being on the horizontal axis and “a” being on the vertical axis, wherein the magnesium alloy has an α-Mg phase,
- wherein the magnesium alloy contains:
- an area fraction X % of a compound comprising the A element and the B element, wherein the X % satisfies Equation 41 below,
- an area fraction Y % of a compound comprising Mg and the A element in terms of area fraction, wherein the Y % satisfies Equation 42 below,
- an area fraction Z % of a compound comprising Mg and the B element, wherein the Z % satisfies Equation 43 below, and
- an area fraction W % of a compound comprising Mg, the A element, and the element B,
- wherein the W % satisfies Equation 44 below, and
- wherein a total content of the X %, the Y %, the Z %, and the W % satisfies Equation 45 below, and
- wherein the magnesium alloy has a thermal conductivity of 75 W/m-K or more;
- (1) if “b” satisfies Equation 1a below, a straight line of Equation 1b below is also satisfied:
- (Equation 1a) 1≤b≤2
- (Equation 1b) a=2
- (2) if “b” satisfies Equation 2a below, a straight line of Equation 2b below is also satisfied:
- (Equation 2a) 2≤b≤5/2
- (Equation 2b) a=2b−2
- (3) if “b” satisfies Equation 3a below, a straight line of Equation 3b below is also satisfied:
- (Equation 3a) b=5/2
- (Equation 3b) a=3≤a≤43/8
- wherein if “a” is in the range of Equation 3a, then b=3 is excluded
- (4) if “b” satisfies Equation 10a below, a straight line of Equation 10b below is also satisfied:
- (Equation 10a) 1≤5/2
- (Equation 10b) a=9b/4−1/4
- (Equation 41) 0<X % ≤10
- (Equation 42) Y %=0
- (Equation 43) 0<Z %≤5
- (Equation 44) 5≤W % ≤40
- (Equation 45) 5≤X % +Y % +Z % +W % ≤45.
Dependencies are inferred from the claim text.