Aluminum-magnesium alloy and method of producing the same

Abstract

Provided are an extruded aluminum (Al)-magnesium (Mg) material and a method of producing the same. An Al—Mg master alloy having a first Mg content is provided. An Al—Mg alloy having a second Mg content less than the first Mg content is prepared by adding the Al—Mg master alloy into molten Al and then casting the molten Al. An extruded Al—Mg material is prepared by extruding the Al—Mg alloy.

Description

TECHNICAL FIELD[0001]The present invention relates to a technology of producing an aluminum (Al) alloy, and more particularly, to an Al-magnesium (Mg) alloy prepared by adding Mg as an alloying element, and a method of producing the same.BACKGROUND ART[0002]Currently, magnesium (Mg) is regarded as one of main alloying elements in an aluminum (Al) alloy. Addition of Mg allows an Al alloy to have a high strength, to be favorable to surface treatment, and to have improved corrosion resistance. As shown in FIG. 1, Mg may be soluble in Al to about 17.4 weight percent (wt %) at about 450° C.[0003]However, due to Mg having a chemically high oxidizing potential, an oxide or another inclusion may be mixed into molten Al during Mg is alloyed into the molten Al and thus the quality of molten metal may deteriorate. If the amount of Mg added into molten Al is added, a problem due to oxidation of Mg becomes serious. The deterioration in quality of molten metal may greatly influence properties of ...

AI Technical Summary

Benefits of technology

The present invention provides a method for producing an Al-Mg alloy with good castability. This is achieved by making a master alloy with a high content of Mg and then diluting it without using protective gas or a small amount of protective gas. The resulting alloy and its processed materials have exceptional mechanical properties, such as high strength and excellent elongation properties, which are better than those of conventional commercial Al alloy and its processed materials.

Problems solved by technology

However, due to Mg having a chemically high oxidizing potential, an oxide or another inclusion may be mixed into molten Al during Mg is alloyed into the molten Al and thus the quality of molten metal may deteriorate.

If the amount of Mg added into molten Al is added, a problem due to oxidation of Mg becomes serious.

For example, if molten Al having a poor quality die to a high content of Mg is casted, casting cracks may be generated.

Also, an Al—Mg alloy prepared by casing the above molten Al has a greatly reduced processability.

However, the SF6 gas not only is high-priced to increase costs but also causes an environmental problem and thus is gradually restricted all over the world.

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