A kind of automobile door sill beam aluminum alloy and preparation method thereof

Abstract

The invention relates to an aluminum alloy for an automobile door sill beam and a preparation method thereof. The method comprises the steps of: (1) adding an aluminum-copper alloy, an aluminum-silicon alloy, magnesium ingots and a manganese agent in the process of smelting molten aluminum; the final aluminum The mass percentage of the added elements in the rod meets: magnesium 0.90-1.10wt%, silicon 0.90-1.10%, manganese 0.50-0.80%, copper 0.20-0.40%; (2) filtering molten aluminum; (3) continuous casting through the casting system , casting aluminum rods; (4) Transfer the aluminum rods to a homogenizing furnace for homogenization, the conditions are 550-570 ° C, 8-12H heat preservation, wind and mist cooling; (5) sawing the aluminum rods to obtain extruded The short stick used. The present invention increases the content of Cu by adjusting the magnesium-silicon ratio, while further improving product performance, and at the same time ensures that the attenuation rate can be lower during post-baking, and the properties of the prepared aluminum alloy can meet the requirements in different states.

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...

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