Post-treatment method of powder hot-pressed aluminum/magnesium/aluminum composite plate

Abstract

The invention relates to a post-treatment method of a powder hot-pressed aluminum / magnesium / aluminum composite plate. The post-treatment method comprises the following steps of (1) carrying out pre-rolling heat treatment on the powder hot-pressed aluminum / magnesium / aluminum composite plate; (2) carrying out rolling plastic deformation treatment on the composite plate subjected to heat treatment in the step (1); and (3) carrying out post-rolling heat treatment on the composite plate treated in the step (2). Compared with the prior art, the method has the advantages that rolling plastic deformation is carried out on the powder hot-pressed aluminum / magnesium / aluminum composite plate, so that the tissue structure of the aluminum / magnesium / aluminum composite plate is densified under the action of large plastic deformation, the defects of holes, virtual connection, non-connection and the like are eliminated, and combination between atoms is further promoted. Then a subsequent heat treatment process is matched, on one hand, internal stress formed in the rolling process is eliminated, the structure is recovered and recrystallized, on the other hand, element diffusion is promoted, the interface bonding quality is guaranteed, plasticity and interface bonding strength are improved, and the comprehensive mechanical property of the aluminum / magnesium / aluminum composite plate is further improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a post-processing method for powder hot-pressed aluminum / magnesium / aluminum composite boards. Background technique [0002] In response to the policy requirements of energy saving, emission reduction, green environmental protection and sustainable development, the lightweight technology of replacing steel with non-ferrous light metals has emerged. Among them, magnesium alloys are widely used due to their high earth reserve content, green environmental protection and recyclability. Magnesium alloys have low specific gravity, high specific strength, good shock absorption and damping properties, and can be used as structural materials. However, its application is limited due to its poor plasticity and corrosion resistance. As a non-ferrous light metal, aluminum alloy not only has the characteristics of low specific gravity and high strength, but also has excellent pla...

AI Technical Summary

Problems solved by technology

However, due to the extremely fast preparation process, the interfacial connection is uncontrollable

However, the rolling process can easily lead to the alignment of aluminum / magnesium composite plates, resulting in low yields. At the same time, aluminum and magnesium alloy plates are prone to form oxide films, and oxide inclusions are formed at the interface during the rolling process, which seriously affects the bonding quality of the composite plate interface.

Hot pressing can be used to add solder at the interface to realize the interface connection of the composite board under high pressure in the form of high temperature thermal diffusion, but for the hot pressing process of the board, the thermal diffusion efficiency is often low, and the interface bonding quality is poor

The aluminum / magnesium composite panel connection technology mentioned above is based on the form of aluminum and magnesium alloy plates. Obviously, the connection of the plates is especially restrictive in technology and product quality.

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