Method for improving structure property uniformity of in-situ particle enhanced aluminum-based composite material

Abstract

The invention relates to a method for improving the structure property uniformity of an in-situ particle enhanced aluminum-based composite material. The method comprises the following steps: performing homogenized thermal treatment on a particle enhanced aluminum-based composite material obtained by in-situ self-generation casting through an alloy element; performing unidirectional hot extrusion deformation on the homogenized in-situ particle enhanced aluminum-based composite material; performing hot rolling on the in-situ particle enhanced aluminum-based composite material subjected to hot extrusion; performing T6 thermal treatment on the rolled in-situ particle enhanced aluminum-based composite material to complete the treatment. By the adoption of two-step orthogonal thermal deformation, the method is favorable for breaking aggregation of self-generated ceramic particles in the in-situ particle enhanced aluminum-based composite material to obtain a uniformly dispersed and distributed ceramic enhanced phase; by the combination of unidirectional extrusion and orthogonal rolling, aluminum matrix crystalline grains can be effectively refined, and a relatively thin and equiaxial matrix crystal grain structure is prepared, so that the uniformity of the structure property of the in-situ particle enhanced aluminum-based composite material is improved.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for improving the uniformity of structure and performance of in-situ particle reinforced aluminum-based composite materials. 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-tech fields such as aerospace and weapon manufacturing, structural materials should have high specific stiffness and specific modulus while requiring high strength and high plasticity. However, traditional metal materials are difficult to meet such complex performance requirements. For example, although traditional steel materials have good strength and plasticity, their density is too high, so they are not suitable for a large number of applications in aerospace and other fields that have high requirements for specific strength of compon...

AI Technical Summary

Problems solved by technology

In industrial applications, it is difficult to disperse a large number of particle agglomerates in the as-cast structure of in-situ particle reinforced aluminum matrix composites with simple unidirectional extrusion or unidirectional rolling deformation processes, and due to the traditional unidirectional extrusion With rolling, the alloy structure will be preferentially oriented, and elongated lath-like or knitted dendrites will be formed in the aluminum matrix, thereby making the structure of the in-situ particle-reinforced aluminum matrix composite extremely inhomogeneous.

Such an inhomogeneous structure will also make the performance of in-situ particle reinforced aluminum matrix composites show obvious anisotropy. Direction, low strength, poor plasticity

The above-mentioned anisotropy of microstructure and properties severely limits the application of in-situ particle-reinforced aluminum matrix composites in industrial production, and is also an urgent problem for material scientists and technicians.