High-toughness heat dissipation aluminum ally material for thin-walled die-casting part and manufacturing method thereof

Abstract

The invention relates to high-toughness heat dissipation aluminum ally for a thin-walled die-casting part and a manufacturing method of the high-toughness heat dissipation aluminum ally. The high-toughness heat dissipation aluminum ally comprises, by weight, 8.0%-12.6% of Si, 1.0%-2.5% of Mg, 0.2%-0.5% of Cu, 0.2%-0.4% of Fe, 0.001%-0.02% of B, 0.005%-0.1% of Sr, smaller than or equal to 0.01% ofother impurity elements and the balance Al. After a molten aluminum body is manufactured, die-casting production is conducted, the temperature of the molten aluminum body ranges from 680 DEG C to 720DEG C, the die temperature ranges from 150 DEG C to 200 DEG C, and after a casting is taken out, air cooling is conducted for 10-50 seconds, so that the temperature of the casting is reduced to rangefrom 30 DEG C to 50 DEG C. By means of a method of rapid cooling of the thin-walled die-casting part, a large number of the Mg elements, the Si elements, the Cu elements and other elements are kept inan Al substrate in a solid solution mode, and therefore the strength of the alloy is improved, and the elongation of a material is guaranteed. The tensile strength of the obtained material in a die-casting state ranges from 308 MPa to 339 MPa, the yield strength ranges from 253 MPa to 271 MPa, the elongation ranges from 3.1% to 4.2%, and the heat conductivity ranges from 115 W / M*k to 126 W / M*k.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a high-strength and tough heat-dissipating aluminum alloy material suitable for thin-walled die-casting parts and a preparation method thereof. Background technique [0002] Aluminum alloy has good corrosion resistance, electrical and thermal conductivity and casting processing performance, and high specific strength, so it is widely used in the fields of communication, electronics and transportation. At present, aluminum alloy die castings are developing in the direction of large, thin-walled, complex, high-precision, high-strength toughness. Aluminum alloy thin-walled die-casting parts also play a pivotal role in the production of housings for communication electronic equipment, such as filter chambers for base stations, transmitter housings, notebook and mobile phone housings, etc. In particular, communication base station equipment is developing in the direction of high heat dis...

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Problems solved by technology

[0004] At present, general industrial die-casting aluminum alloys mainly include Al-Si-Mg alloys (such as YL104, A356, A360, etc.), and Al-Si-Mg alloys need solid solution strengthening and aging treatment to improve their mechanical properties. It is inevitable that the casting will be deformed, and the correction process needs to be increased to increase the preparation cost; and another type of traditional die-casting Al-Si-Cu alloy (such as ADC12, etc.), the content of Cu added to this type of alloy is relatively high, generally At 2% to 5% Cu, although Cu can increase the strength of die castings, it reduces the toughness of castings, and the addition of too much Cu will reduce the corrosion resistance of castings; there is also a type of die-casting aluminum alloy material with better toughness It is Al-Mg series, such as domestic YL302, Japanese ADC5, ADC6 and American 518 and other brands of die-casting aluminum alloys. This type of alloy has good corrosion resistance, high strength and toughness, but due to the high content of Mg, it generally contains 4 %~6% Mg, Mg is easy to oxidize during smelting and die-casting, and brings inclusions into it, resulting in poor casting performance, large wall thickness effect, and die-casting parts are prone to defects such as cracking and stress corrosion cracking

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