High-silicon wrought aluminum alloy material and production method thereof

Abstract

The invention provides a high-silicon wrought aluminum alloy material and a production method thereof. The high-silicon wrought aluminum alloy material comprises the following components in percentage by weight: 8.0%-11.0% of Si, 4.0%-6.5% of Cu, 2.0%-3.6% of Mg, 0.5%-2.5% of Mn, 7.5%-9.5% of Zn, Cr is less than or equal to 0.50%, Ti is less than 0.05%, Ni is less than 0.05%, and the balance of Al, wherein each other impurity monomer is less than or equal to 0.05%, and other impurities are less than or equal to 0.15%. The production method comprises the following steps and main process parameters: when the smelting temperature reaches 700-750 DEG C, adding 0.02%-0.05% of an Sr alterant according to the total weight of the raw materials in an Al-Sr intermediate alloy manner, then carrying out deaeration at 710-720 DEG C, filtering the impurities, and carrying out refining and ingot casting. According to the production method, the organization form of high-silicon aluminum alloy is effectively improved, and the mechanical property of the aluminum alloy is improved.

Description

technical field [0001] The invention relates to a high-strength, high-wear-resistant high-silicon deformed aluminum alloy material and a production method thereof. Background technique [0002] Adding a higher content of silicon to the aluminum alloy forms a high-silicon alloy. This material has the advantages of low density, small thermal expansion coefficient, good wear resistance, strong elongation, and light weight. It is gradually popular at home and abroad in aviation, aerospace, Favored and valued by industries such as automobiles and compressors. However, due to the high content of Si in the alloy, when no modification treatment is carried out, serious primary silicon aggregation is easily formed in the ingot, which will reduce the strength and elongation of the alloy. Therefore, the alloy must be modified. The comparative document CN1120598A, published on April 16, 1996, discloses a method for modifying high-silicon aluminum alloys. The elongation rate has been in...

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Problems solved by technology

However, due to the high content of Si in the alloy, when no modification treatment is performed, serious primary silicon aggregation is easily formed in the ingot, which will reduce the strength and elongation of the alloy.

Therefore, the alloy must be modified. The comparative document CN1120598A, published on April 16, 1996, discloses a method for modifying high-silicon aluminum alloys. The elongation rate has been increased from an average of 2.6% that has never deteriorated to 3.0%-4.5%. The advantage is that it has a better metamorphic effect on sand casting, but it has a poor effect on vertical semi-continuous cold casting that contains Sb and has a large cooling rate. The main reason is that Sb forms a coarse intermetallic compound, which affects the modification effect

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