Aluminum/magnesium/aluminum composite plate with Zn solder reinforced interfaces and powder hot-pressing preparation method thereof

Abstract

The invention relates to an aluminum/magnesium/aluminum composite plate with Zn solder reinforced interfaces and a powder hot-pressing preparation method thereof. The method comprises the following steps: (1) respectively spreading aluminum-containing powder and magnesium-containing powder in a mold according to an aluminum-magnesium-aluminum sequence, and adding Zn solder at aluminum/magnesium interfaces; (2) pre-pressing each powder layer immediately after the powder layer is spread in the step (1) by using a pressure head, and flattening and compacting the powder to finally form a pre-pressed composite powder block with a certain layer thickness; and (3) subjecting the pre-pressed composite powder block treated in the step (2) to hot-pressing compounding, and carrying out pressure-maintained cooling so as to obtain the aluminum/magnesium/aluminum composite plate with the Zn solder reinforced interfaces. The aluminum/magnesium/aluminum composite plate with the Zn solder reinforced interfaces has the advantages of light weight, high specific strength, high interface bonding strength, excellent comprehensive mechanical properties and the like. The composite plate and the powder hot-pressing preparation method have the advantages of low powder quality requirement, high composite plate interface bonding quality, simple preparation method, high yield, high production efficiency, production cost conservation and the like.

Description

Technical field [0001] The invention belongs to the technical field of metal composite materials, and in particular relates to an aluminum / magnesium / aluminum composite board with a Zn brazing filler metal reinforced interface and a powder hot pressing preparation method. Background technique [0002] As a close-packed hexagonal crystal structure, magnesium alloy has poor room temperature plastic deformation ability, high specific strength and low plasticity, but aluminum alloy has a face-centered cubic crystal structure with more slip systems, and its room temperature plastic deformation ability is better than that of magnesium alloys. many. Furthermore, since the two are both non-ferrous light metals with light specific gravity and excellent structural mechanical properties, the aluminum / magnesium composite method can be used to make up for each other’s insufficiency to give play to their respective advantages and improve the overall mechanical properties of the aluminum / magnesi...

AI Technical Summary

Problems solved by technology

The explosive welding method is to use the explosive shock wave generated by the explosion to make the metal material interface collide at high speed, and realize the connection of the metal plates under the action of high pressure. However, the explosive welding has the characteristics of instantaneous, extremely fast and complex physical and chemical reactions, and the interface of the composite plate is uncontrollable. The preparation environment is harsh and it is difficult to realize automatic production

The hot-rolled aluminum / magnesium clad plate is easy to form oxidation on the surface of the metal plate, resulting in oxide inclusions at the rolling interface, which seriously affects the bonding quality of the clad plate interface

At the same time, the rolling process is easy to cause edge cracks in the aluminum / magnesium composite plate, and the yield is relatively low

Diffusion welding can make the solder and the base metal wet, diffuse and dissolve each other by adding solder to achieve the bonding of the interface of the composite plate, but the wettability of the solder to the aluminum and magnesium alloy plates, the ability to fill the interfacial gap and the diffusion The formation of brittle intermetallic compounds at the interface directly affects the bonding quality of the composite plate interface

[0008] At present, the preparation of magnesium-aluminum composite panels mainly includes solid / solid composite, solid / liquid composite, and liquid / liquid composite methods. Rolling and hot pressing are the most used methods, and there is no powder preparation method.

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