A kind of high-strength and high-toughness die-casting aluminum alloy and products thereof

Abstract

The invention discloses a high-strength and high-toughness die-casting aluminum alloy and a product thereof. The alloy belongs to an Al-Si-Mn-Mg-Re system and is composed of the following components in mass percent: 7.5% to 8.5% of silicon, 0.3% to 0.4% of manganese, 0.2% to 0.3% of magnesium, 0.1% to 0.2% of rare earth, 0.01% to 0.02% of strontium, less than or equal to 0.15% of ferrum, less than or equal to 0.10% of titanium, less than or equal to 0.05% of copper, aluminum and inevitable trace impurities, wherein the content of a single element of the trace impurities is less than or equal to 0.05%, and the total content of the trace impurities is less than or equal to 0.15%; the product is prepared from the high-strength and high-toughness die-casting aluminum alloy. The die-casting aluminum alloy has high strength and high toughness, and good mechanical properties can be obtained in casting conditions without T6 heat treatment. When the T6 heat treatment is performed, the mechanical properties of the material can be further increased. The alloy material can satisfy the car lightweighting development requirement and is used for manufacturing key components such as car chassis subframes, car door pillars and the like.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and more specifically relates to a high-strength and high-toughness die-casting aluminum alloy and its products. Background technique [0002] Die casting, referred to as die casting, is a high-speed and efficient advanced forming process. It is one of the main forming methods for complex thin-walled aluminum and magnesium alloy castings. It occupies a considerable share in the production of aluminum and magnesium alloy parts for automobiles / motorcycles. Proportion. [0003] At present, the die-casting aluminum alloy materials most widely used in industry are Al-Si-Cu alloys, such as domestic YL112, YL113, Japanese ADC12, ADC10, and American A380, AlSi9Cu3Fe, etc. The above alloys have excellent casting properties and good mechanical properties; followed by Al-Si-Mg alloys with good impact resistance and fatigue strength, such as YL104, ADC3, A360, etc.; the third is Al-Mg alloys,...

AI Technical Summary

Problems solved by technology

Therefore, the existing Al-Si-Cu series, Al-Si-Mg series, and Al-Mg series die-casting aluminum alloys are not high-strength, high-toughness die-casting aluminum alloy materials, and cannot meet the requirements of complex thin-walled, high-strength, and high-toughness , impact resistance and other automotive high stress parts requirements

[0004] In order to meet the development needs of high-stress, high-strength, high-toughness aluminum alloy parts such as chassis sub-frames, door pillars, etc., some new high-strength, high-toughness aluminum alloy materials have been developed abroad and have been industrialized. The common feature of the alloy is that the Al-Si-Mg system is used, and the content of Fe and Cu is strictly controlled. Good mechanical properties can be obtained through T6 heat treatment. However, this alloy still cannot meet the development needs of high-stress automotive parts.

At present, there is still a lack of high-strength and tough die-casting aluminum alloys that can obtain good mechanical properties in the as-cast state without T6 heat treatment. one of the key points of

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