Refining method for aluminum alloy

Abstract

The invention provides a refining method for aluminum alloy. According to the method, Al-Ce binary amorphous alloy is used as an aluminum alloy refining agent, and the atomic percent of Ce in the Al-Ce binary amorphous alloy is 7 to 10%; and the refining agent is an amorphous material and can provide a great number of uniformly-distributed nanometer nucleation particles after added into an aluminum melt, so the refinement effect of A356.2 alloy is substantially improved. The method is simple, has a short production period and overcomes the disadvantages of complex process, long process time, limited refinement effect and the like in conventional melting and preparation process.

Description

technical field [0001] The invention relates to the field of aluminum alloy smelting, in particular to a method for refining aluminum alloy. Background technique [0002] A356.2 aluminum alloy has excellent characteristics such as good fluidity, no thermal cracking tendency, small linear shrinkage, small specific gravity, and good corrosion resistance. It is the main material used for automobile wheels. However, the as-cast microstructure of the unrefined A356.2 aluminum alloy is coarse flake or needle-like eutectic silicon and α-Al dendrites, and its mechanical properties are low. Therefore, it is necessary to add modification elements and grain refinement elements to change the shape of eutectic silicon from thick flakes or needles to fine spherical or rods, and at the same time refine the α-Al grains to improve A356.2 Improve the performance of the alloy and expand its application range. At present, the commonly used refining agents for A356.2 aluminum alloy in industri...

AI Technical Summary

Problems solved by technology

The refiner is a crystalline material, and its microstructure consists of α-Al and TiAl with a scale of micron 3 、TiB 2 , AlB 2 and Al 3 Sc crystal phase composition, micron-scale precipitated phases provide limited nucleation particles, limiting the refinement effect of elements

[0006] In summary, the aluminum alloy refiners in the prior art are either expensive and difficult to be widely used, or the steps and processes are complicated, which limits their application in production