MAGNESIUM ALLOY AND CASTING

Abstract

A magnesium alloy containing aluminum, manganese and calcium includes 6˜12% by weight of aluminum, 0.1˜1.5% by weight of manganese, a calcium/aluminum mass ratio being 0.55˜1.0, and balance being magnesium and inevitable impurities.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawings, wherein:

FIG. 1 is a graph illustrating a relationship between an amount of aluminum and an amount of calcium and a Ca/Al mass ratio;

FIG. 2 is a conceptual scheme diagrammatically illustrating a cutting form of a ring test piece for measuring a bolt-loading of a bolt;

FIG. 3 is a conceptual structure view schematically illustrating a measurement of the bolt-loading of the tightened bolt;

FIG. 4 is a perspective view illustrating a test piece for evaluating casting cracks;

FIG. 5 is a graph illustrating results of minimum strain rates;

FIG. 6 is a photomap of a metal structure;

FIG. 7 is a photomap of a metal structure;

FIG. 8 is a photomap of a metal structure;

FIG. 9 is a photomap of a metal structure;

FIG. 10 is a photomap of a metal structure;

FIG. 11 is a photomap of a metal structure;

FIG. 12 is a photomap of a metal structure; and

FIG. 13 is a photomap of a metal structure.

Claims

1. A magnesium alloy containing aluminum, manganese and calcium, comprising: 6˜12% by weight of aluminum;0.1˜1.5% by weight of manganese;a calcium/aluminum mass ratio being 0.55˜1.0; andbalance being magnesium and inevitable impurities.

2. A magnesium alloy according to claim 1, further comprising; at least one of equal to or less than 1.5% by weight of strontium, equal to or less than 2.5% by weight of rare earth element, equal to or less than 1% by weight of silicon; andequal to or less than 2% by weight of tin.

3. A magnesium alloy according to claim 1, wherein the calcium/aluminum mass ratio is 0.60˜0.88.

4. A magnesium alloy according to claim 1, wherein the manganese is equal to or less than 0.2˜1.0% by weight.

5. A magnesium alloy according to claim 1, wherein the calcium is equal to or greater than 4% by weight.

6. A magnesium alloy according to claim 1, wherein the calcium is equal to or greater than 5% by weight.

7. A magnesium alloy according to claim 1, wherein the magnesium alloy includes a phase (Mg17Al12) and the β phase (Mg17Al12) is equal to or less than 0.5% in an area ratio.

8. A casting characterized in being formed from a magnesium alloy according to claim 1.