Scandium-containing oxidable die-casting aluminium alloy, preparation method and structural part

Abstract

The invention discloses a scandium-containing oxidable die-casting aluminium alloy and a preparation method thereof. The aluminium alloy comprises the following components by mass: 1-2 percent of Mn, 1-2 percent of Ni, 1-3 percent of Zn, 0.8-2 percent of Mg, 0.05-0.3 percent of Sc, 0.05-0.2 percent of Zr, 90-95 percent of Al and less than 0.15 percent of Fe and Si impurities. The invention further discloses a structural part containing the aluminium alloy. The aluminium alloy provided by the invention has the advantages of high strength, good anodic oxidation property and good die-casting property, and can be used for manufacturing thin-walled casing members meeting high appearance and performance requirements.

Description

technical field [0001] The invention relates to an aluminum alloy, in particular to a scandium-containing oxidizable die-casting aluminum alloy, a preparation method and a structural part containing the aluminum alloy. Background technique [0002] Traditional die-casting aluminum alloys are mainly Al-Si, Al-Mg, Al-Zn and other series alloys. Al-Si series alloys have the best fluidity because of their high Si content, so they are the most widely used, but due to Silicon has an adverse effect on anodic oxidation, which makes it more limited in the application of appearance parts. [0003] Al-Mg series alloys can be anodized, but Mg is easy to cause hot brittle castings and poor fluidity, which is not conducive to die-casting of thin-walled parts. The Al-Zn system has high strength, but it also has a tendency to hot cracking, and its casting performance is not good. [0004] In response to the above problems, many research institutions have conducted research in the followin...

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Problems solved by technology

[0005] 1. If it is optimized for the Al-Si series, it is hoped to solve the problem of anodic oxidation of this series of alloys, but it has been proved that in addition to black anodic oxidation, other color oxidations are still not possible, which is a problem for shells that require a decorative appearance , the application is limited

[0006] 2. Carry out research on new die-casting aluminum, such as Al-Mn-Co series, which has good anodic oxidation performance, but its casting performance is still far worse than that of Al-Si series, and its strength is not high, especially for thin-walled parts. Requirements for mechanical properties

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