Aluminum alloy having improved oxidation resistance, corrosion resistance, or fatigue resistance, and die-cast material and extruded material prepared by using the aluminum alloy

Abstract

Provided are an aluminum (Al) alloy prepared environment friendly and having excellent oxidation resistance properties, and a method of preparing the Al alloy. An oxidation-resistant Al alloy according to an embodiment of the present invention is casted by adding a magnesium (Mg) master alloy, in which a calcium (Ca)-based compound is distributed in an Mg matrix, into molten Al. An Al matrix includes the Ca-based compound. The Al alloy has superior oxidation resistance to a corresponding Al alloy not including the Ca-based compound.

Description

TECHNICAL FIELD[0001]The present invention relates to an aluminum (Al) alloy, and more particularly, to an Al alloy having improved oxidation resistance, corrosion resistance, or fatigue resistance, and a die-cast material and an extruded material prepared by using the alloy.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. 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. In order to prevent an oxide or another inclusion from being mixed into molten Al, for example, the surface of molten metal may be covered with a protective gas such as SF6 when Mg is added.[0003]However, due to properties of a process of prepari...

AI Technical Summary

Benefits of technology

The present invention is related to an aluminum alloy that can be used to prepare stable die-cast products and extruded materials with excellent mechanical properties, even without the need for a protective gas. The alloy also exhibits improved mechanical properties, including strength and fatigue resistance, due to the addition of a calcium-based compound that is distributed throughout the aluminum matrix, resulting in a strengthening effect and grain refinement. Additionally, the alloy exhibits improved oxidation and corrosion resistance.

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.

However, due to properties of a process of preparing an Al alloy, it may not be easy to completely protect Mg, which is added in large amounts, with a protective gas.

Furthermore, since SF6 used as the protective gas not only is expensive gas but also causes an environmental problem, the use of SF6 is now being gradually restricted all over the world.

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