Al-Mg-Si alloy and preparation method and application thereof

Abstract

The invention discloses an Al-Mg-Si alloy as well as a preparation method and application thereof. The invention relates to an Al-Mg-Si alloy which comprises the following components in percentage by weight: 0.48 to 0.54 percent of Si, 0.82 to 0.87 percent of Mg, 0.16 to 0.22 percent of Cu, 0.015 to 0.03 percent of Mn, 0.04 to 0.08 percent of Cr, 0.009 to 0.03 percent of Ti, 0.016 to 0.03 percent of Zn and the balance of Al and impurities, and the sum of the weight percent of Mg and the weight percent of Si is 1.30 to 1.38 percent. The mass ratio of the Si to the Mg is 1: (1.52-1.82). Through material component optimization and process setting, the problem of high quenching sensitivity of the aluminum alloy material in quenching heat treatment is solved, and the problem of low yield caused by quenching heat treatment of the aluminum alloy section under the condition of considering the performance indexes of the alloy is solved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to an Al-Mg-Si alloy and a preparation method and application thereof. Background technique [0002] New energy vehicles have developed rapidly in recent years. Compared with traditional vehicles, new energy vehicles have the advantages of energy saving and emission reduction. Most of the transmission shaft, battery tray, bumper, body, etc. are made of steel materials. In new energy vehicles, 6-series aluminum alloys are gradually used to replace the above-mentioned steel materials. Under this condition, the steel parts and aluminum parts of the same car, The use of 6-series aluminum alloys as materials can reduce the weight of the car body by 2 / 3 and achieve light weight in the true sense; at the same time, 6-series aluminum alloys can achieve high strength and high corrosion resistance through heat treatment. In addition, 6-series aluminum alloys also have good welding pro...

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Problems solved by technology

[0003] At present, the GB / T 14846-2014 standard is adopted for the dimensional deviation of 6-series aluminum alloy profiles. In the process of processing 6-series aluminum alloy profiles in related technologies, in order to satisfy the saturated solid solution of the strengthening phase and achieve the corresponding strength, relatively high High cooling intensity, but the cooling intensity is too fast and too large, resulting in uneven distribution of residual stress during quenching, resulting in increased residual stress after quenching of the profile, and further dimensional deformation of the profile, specifically manifested as flatness on the profile surface and bending in the length direction And twisting, resulting in the failure of the 6-series aluminum alloy profiles to meet the GB / T 14846-2014 standard, and a decrease in the yield rate, resulting in deviations in the precision machining (CNC) of the post-process computer digital control precision machining (CNC) and scrapping, and unable to meet all post-process requirements. Component assembly size requirements and capacity waste issues

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