Aluminum-silicon series deforming alloy and manufacturing method thereof

Abstract

The present invention discloses aluminum silicon deformable aluminum alloy and the preparation method thereof. According to the weight percentages, the alloy contains 9.0-12.6 percent of silicon, 1.5-4.0 percent of copper, 0.3-0.6 percent of magnesium, 0.1-3.5 percent of bismuth, less than 0.30 percent of iron, less than 0.20 percent of zinc, less than or equal to 0.15 percent of impurity, and aluminum as the residual. The raw material is molten and fined in a reflecting smelting furnace, after Al-Sr intermediate alloy modification to the alloy liquid, cast rods are obtained through semi continuous casting, and after hot extrusion and deformation to the cast rods, the aluminum silicon deformable aluminum alloy is produced through forging and T6 heat treatment. After adding the element bismuth into the alloy, the present invention greatly enhances the wear-resisting performance of the alloy, leads the alloy to have self lubricating property, prolongs the service life of the product produced with the alloy, reduces the use cost, and leads the alloy to have the tensile strength of above 390 MPa, the elongation rate after breaking of 6 percent, and the hardness degree of 136-141 HB. The present invention is mainly used for producing vehicle components of wheels, pistons, bearings, and two-side swash plates of vehicles and motorcycles which have high demands on the intensity, the toughness and the abrasion resistance.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to an aluminum-silicon-based deformed aluminum alloy with high strength, good toughness and excellent wear resistance and a preparation method thereof. Background technique [0002] With the development of my country's transportation industry, the requirements for the performance of alloy materials are getting higher and higher. At present, my country's existing aluminum-silicon series deformed aluminum alloys 4A11, 4032 and Japan's A4032 and other aluminum-silicon series deformed aluminum alloys have high temperature performance, cutting Performance, corrosion resistance and wear resistance are relatively poor and can not be self-lubricating, so that the service life of products made of alloys is short, and the cost of use is greatly increased, which is far from meeting the high performance and low cost proposed by domestic and foreign merchants. The index requirements, and...

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Problems solved by technology

[0002] With the development of my country's transportation industry, the requirements for the performance of alloy materials are getting higher and higher. At present, my country's existing aluminum-silicon series deformed aluminum alloys 4A11, 4032 and Japan's A4032 and other aluminum-silicon series deformed aluminum alloys have high temperature performance, cutting Performance, corrosion resistance and wear resistance are relatively poor and can not be self-lubricating, so that the service life of products made of alloys is short, and the cost of use is greatly increased, which is far from meeting the high performance and low cost proposed by domestic and foreign merchants. The index requirements, and the above-mentioned alloys contain nickel, an expensive and scarce element, which limits the use of this type of alloy

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