Preparation method of superplastic aluminum-based composite material plate

Abstract

The invention discloses a preparation method of a superplastic aluminum-based composite material plate. The method comprises the following steps: carrying out pre-rolling heat treatment including solid solution and overaging on a to-be-processed aluminum-based composite material, and turning and peeling the surface of the aluminum-based composite material after heat treatment until the surface is flat; and then carrying out multi-pass medium-temperature rolling, conducting homogenizing heat treatment before each pass of rolling, and stretching and straightening the rolled plate. According to the method, heat treatment before rolling and medium-temperature rolling machining forming are combined so that matrix grains are substantially refined, and the material forming rate is increased; the in-situ nano-particle reinforced phase TiB2 is added into aluminum alloy for pinning and rolling a grain boundary to prevent grain growth, the thermal stability is good, and the effect of suppressing the grain growth and cavity generation of grains in high-temperature deformation is achieved; and the longitudinal elongation of the plate can reach 350%-600% under the deformation process conditions of 400-475 DEG C and 10<-3>-10<-4> / s, and the high-temperature superplasticity is excellent.

Description

technical field [0001] The invention relates to the field of aluminum-based composite material processing, in particular to a preparation method of a superplastic aluminum-based composite material plate. Background technique [0002] Superplasticity refers to the ability of polycrystalline materials to exhibit ultrahigh elongation before fracture. Usually a material is said to be superplastic when its elongation is greater than 200%. The macroscopic characteristics of superplastic deformation can be classified into four points, which are large deformation, small deformation resistance, no necking, and easy forming. Although superplasticity is not a unique property of metallic materials, some non-metallic materials, such as ceramics and organic materials, can also exhibit superplasticity under specific microstructures, deformation temperatures and strain rates. However, due to the ultra-high plasticity of metal materials, the current research focus on superplasticity mainly...

AI Technical Summary

Problems solved by technology

Although the aluminum alloy materials prepared by these methods have fine grains and good superplasticity, it is difficult to form large-scale production and cannot be put into industrial application.

However, the fine-grained structure of industrial aluminum alloys produced by traditional thermomechanical processing of aluminum alloys is prone to recovery, recrystallization and growth of grains at subsequent high temperatures, coarsening of grains, and loss of superplasticity of the material.

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