Automobile sill beam aluminum alloy and preparation method thereof

Abstract

The invention relates to an automobile sill beam aluminum alloy and a preparation method of the automobile sill beam aluminum alloy. The method comprises the following steps of (1) in the process of smelting molten aluminum, adding an aluminum-copper alloy, an aluminum-silicon alloy, magnesium ingot and a manganese agent, wherein the mass percentage of added elements in a final aluminum rod is asfollows: 0.90-1.10wt% of magnesium, 0.90-1.10wt% of silicon, 0.50-0.80wt% of manganese, and 0.20-0.40wt% of copper; (2) filtering an aluminum liquid; (3) performing continuous casting through a casting system to obtain an aluminum rod; (4) transferring the aluminum rod into a homogenizing furnace for homogenization under the temperature of 550-570 DEG C, performing heat preservation for 8-12 h, and carrying out air mist cooling; and (5) sawing the aluminum rod to obtain short rods for extrusion. By adjusting the magnesium-silicon ratio, the content of Cu is increased, the product performance is further improved, and meanwhile, it is ensured that the decay rate can be low during later-period baking, and the performance of the prepared aluminum alloy in different states can meet requirements.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to an aluminum alloy for an automobile threshold beam and a preparation method thereof. Background technique [0002] With the promotion of aluminum alloys in the automotive industry, more and more places use aluminum alloys to replace the original steel, which further increases the requirements for the mechanical properties of aluminum alloys. [0003] At present, the performance requirements of automobile threshold beams in normal aging state and after thermal stability treatment are as follows: [0004] 1. Performance requirements under normal aging state (hereinafter referred to as normal state): compressive strength ≥ 310Mpa, yield strength = 290-320Mpa, elongation ≥ 10%; [0005] 2. Under normal conditions, the product undergoes short-term baking treatment for thermal stability (hereinafter referred to as short cycle), and its performance also needs to meet the norm...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problem that the existing 6-series aluminum alloys cannot simultaneously meet the higher normal performance requirements and the performance requirements after baking in different cycles, the purpose of the present invention is to provide an aluminum alloy for an automobile door sill beam and a preparation method thereof. The aluminum alloy of the automobile door sill beam is a 6-series medium-high-strength thermal stability material, which not only meets the higher normal performance requirements, but also meets the performance requirements after different cycles of baking

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