Aluminum magnesium alloy composite board and preparing method thereof

Abstract

The invention discloses an aluminum magnesium alloy composite board. The aluminum magnesium alloy composite board comprises an aluminum alloy board and a magnesium alloy board; the aluminum alloy board and the magnesium alloy board are stacked, and through friction stir welding, connection is achieved; the aluminum alloy board and the magnesium alloy board which are welded and stacked together aresubject to hot rolling to form the aluminum magnesium alloy composite board; a preparing method of the aluminum magnesium alloy composite board comprises the steps that the steps that the aluminum alloy board and the magnesium alloy board are machined to the predetermined dimension for standby application; secondly, the aluminum alloy board and the magnesium alloy board to be subject to standby application are subject to mechanical treatment and chemical cleaning, and surface oil stains and an oxide film can be removed; thirdly, the prepared aluminum alloy board and the prepared magnesium alloy board are horizontally stacked on a welding worktable, and are fixed through a clamp; fourthly, the stir friction welding manner is used for welding the aluminum alloy board and magnesium alloy board laminated slab; fifthly, the welded aluminum alloy board and magnesium alloy board composite board is put into a box type resistance furnace to be preheated; and sixthly, the preheated aluminum alloy board and magnesium alloy board composite board is fed into a rolling mill to be subject to hot rolling.

Description

technical field [0001] The invention belongs to the technical field of metal composite plates, and in particular relates to an aluminum-magnesium alloy composite plate and a preparation method thereof. Background technique [0002] Magnesium alloy, as the lightest metal structure material in industrial application at present, has the advantages of high specific strength and specific stiffness, good thermal conductivity and cutting performance, strong electromagnetic shielding and anti-seismic noise reduction ability, easy recycling and little environmental pollution, etc., and is known as "21st Century Green Metal Structural Materials" has broad application prospects in the fields of electronic appliances, automobile transportation and aerospace. In order to reduce energy consumption and reduce environmental pollution, automobile companies and parts suppliers have vigorously carried out lightweight research. Magnesium alloy can not only significantly reduce the body weight ...

AI Technical Summary

Problems solved by technology

Due to the differences in the melting point, thermal conductivity, and expansion coefficient of heterogeneous materials, it is difficult to form a reliable fusion welding joint. Therefore, the fusion welding process of magnesium and aluminum alloys is complicated, and the heat-affected zone is easy to form magnesium-aluminum hard and brittle intermetallic compounds. In the follow-up During the rolling process, the density of the interface is significantly reduced, and the strength of the composite sheet is significantly reduced

Diffusion composite method equipment is complicated and expensive, and the production cycle is long, which is not conducive to large-scale production

The composite casting method requires a lot of equipment, high casting temperature, and difficult to control the quality of the plate

The production process of the cladding composite method is complicated. The cladding material needs to be connected with the composite plate before the cladding, and the cladding material needs to be removed after the cladding, resulting in waste of materials and increasing production costs.

The riveting composite method directly rivets the aluminum-magnesium alloy plate and then rolls it. The deformation of the plate is not easy to control, the riveting process is complicated, and the selection of the rivet is difficult and the cost is high.

After the plate is compounded by rolling, the riveting part needs to be removed by machining, which causes waste of material and increases the complexity of the process

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