Method for Improving the Uniformity of Microstructure and Properties of In-Situ Particle Reinforced Aluminum Matrix Composites

Abstract

The invention relates to a method for improving the uniformity of the microstructure and performance of in-situ particle reinforced aluminum-based composite materials. The particle-reinforced aluminum-based composite material obtained by in-situ autogenous casting is subjected to homogenization heat treatment of alloy elements; the homogenized in-situ particle The reinforced aluminum matrix composite is subjected to unidirectional hot extrusion deformation; the hot-extruded in-situ particle-reinforced aluminum-matrix composite is hot-rolled; the rolled in-situ particle-reinforced aluminum-matrix composite is subjected to T6 heat treatment, namely Finish processing. The invention adopts two-step orthogonal thermal deformation, which is beneficial to break up the agglomeration of self-generated ceramic particles in the in-situ particle reinforced aluminum matrix composite material, and obtain a uniformly dispersed ceramic reinforcement phase, and through unidirectional extrusion and orthogonal rolling phase Combined, it can effectively refine the grains of the aluminum matrix and prepare a finer and equiaxed matrix grain structure, thereby improving the uniformity of the microstructure and properties of the in-situ particle-reinforced aluminum matrix composite.

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.