Method for preparing high-strength high-plasticity aluminum-based composite material

Abstract

The invention relates to a method for preparing a high-strength high-plasticity aluminum-based composite material. High-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr intermediate alloy, KBF<4> and K<2>TiF<6> serve as raw materials, and by the adoption of an in-situ melt synthesis control method, the in-situ TiB<2> micro-nano particle reinforced Al-Zn-Mg-Cu alloy composite material is prepared. The extrusion deformation direction of each pass is perpendicular to the extrusion direction of the last pass. Extrusion deformation is conducted in multi-pass orthorhombic laminated extrusion mold equipment, a large amount of accumulated shearing strain can be applied to the particle reinforced aluminum-based composite material, and then the mechanical stirring function is achieved. In-situ synthesis TiB<2> particle aggregates in the composite material are scattered, micro-nano TiB<2> particles are evenly dispersed and distributed in an aluminum matrix, Al-Zn-Mg-Cu matrix grain structures of the composite material can be refined, and even and fine isometric crystals are obtained. The aluminum-based composite material prepared through the method can achieve high strength and high plasticity simultaneously.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a high-strength and high-plasticity aluminum-based composite material. Background technique [0002] With the development of modern science and technology, the requirements for material properties in practical applications have become more stringent. Especially in high-end fields such as aerospace and weapon manufacturing, structural materials should have high specific stiffness and specific modulus while requiring high strength and high plasticity. It is difficult for traditional metal materials to meet such complex performance requirements. For example, although traditional steel materials have good strength and plasticity, their density is too high, which is not suitable for a large number of applications in aerospace and other fields that require high specific strength of components; and titanium alloys, although high in strength, Howeve...

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Problems solved by technology

[0006] Aiming at the problem that the strength and plasticity of the particle-reinforced aluminum-matrix composite cannot be obtained at the same time, the present invention proposes a method for in-situ production of micro-nano particle-reinforced aluminum-matrix composite material, combined with large plastic deformation modification, to prepare a At the same time, it has high strength and high plasticity aluminum matrix composite material, and the process is simple and easy to operate, low cost and high efficiency, and can generate large size samples

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