Rare earth-containing aluminum alloy used for semisolid state rheoforming and preparation method of semisolid state slurry thereof

Abstract

The invention belongs to the technical field of semisolid state metal forming and aims at providing a rare earth-containing aluminum alloy used for semisolid state rheoforming and a preparation method of semisolid state slurry thereof. The ingredients of the alloy include: 6.5-7.5wt. percent of Si, 0.25-0.45wt. percent of Mg, 0.1-0.8wt. percent of Er and the balance of aluminum and unavoidable impurities. Compared with the alloy without adding element Er, the aluminum alloy has finer and more uniform spherical particles of the semisolid state tissue due to the addition of rare earth element Er and the refining of primary alpha-Al phase. The characteristic that the given alloy is suitable for the semisolid state forming is mainly represented in the following aspects: 1) the primary alpha-Al phase is fine and uniform spherical non-arborescent tissue; and 2) during the semisolid state rheoforming, the control accuracy on temperature is reduced and a complicated preparation device is not needed, thus reducing technological control cost.

Description

technical field [0001] The invention relates to a rare earth aluminum alloy for semi-solid rheological forming and belongs to the technical field of semi-solid metal forming. Background technique [0002] Since Professor M.C. Flemings proposed the concept of semi-solid forming in the 1970s, semi-solid forming technology has attracted the attention of various countries due to its unique technical advantages and broad application prospects. Compared with the traditional liquid or solid forming process, semi-solid forming technology has a series of advantages: 1) Improve product quality, reduce casting defects such as pores, shrinkage porosity, and segregation; 2) Reduce thermal shock of the mold and significantly increase the life of the mold; 3 ) The solidification shrinkage is small, the dimensional accuracy of the casting is high, and near-net forming can be realized; 4) Compared with the metal solid-state forming method, the flow stress of the semi-solid metal is significa...

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Problems solved by technology

Liu Zheng et al. (Liu Zheng, et al., Effect of yttr um on the microstructure of a semi-solid A356 Al alloy. Rare metals, 2008, 27: 536-540) used heavy rare earth Y to refine A356 to prepare semi-solid slurry, but the primary phases of the semi-solid structure obtained have low roundness and are adjacent to each other, which is not conducive to semi-solid forming. The research on the rare earth element Er has not been reported. my country's rare earth resources are abundant, which is very important for the development of semi-solid forming The rare earth aluminum alloy has a great impetus.

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