Isotropical high-strength high-toughness particle reinforced aluminium-based composite material and preparation method thereof

Abstract

The invention relates to isotropical high-strength high-toughness particle reinforced aluminium-based composite material and a preparation method thereof. In the composite material, the granularity of reinforced particles is 1-25 mu m, the volume percentage is 5%-30%, the reinforced particles are dispersed and distributed in a substrate in the aspect of space, and the reinforced particles and the substrate form high-strength interface combination. The preparation method comprises adding the reinforced particles and aluminium alloy powder into a material mixing barrel for mechanical mixing, so as to obtain a composite material, then performing vacuum hot pressing on the composite material to form preform bodies, and successively performing extrusion, forging and rolling on the preform bodies for deformation. The prepared composite material can be used as bearing members with complex stress in the aerospace field. The product is characterized in that the material has excellent properties such as isotropical property, high strength, high toughness and the like, and is stable in quality, low in cost, easy for large-scale industrial production, and the like.

Description

technical field [0001] The invention belongs to the technical field of particle-reinforced aluminum-based composite materials; in particular, it relates to a preparation method for particle-reinforced aluminum-based composite materials with isotropy and high strength and toughness. Background technique [0002] Compared with the matrix alloy, the particle-reinforced aluminum matrix composite has excellent comprehensive properties such as high specific strength, high specific stiffness, small thermal expansion coefficient, and good thermal conductivity. It has begun and gradually been widely used in the aerospace field. Since the 1980s, my country has invested a lot of manpower and material resources in the research and application development of this type of composite materials, trying to use lightweight particle-reinforced aluminum-based composite materials as structural materials in important applications such as aerospace. To replace the traditional aluminum alloy and tita...

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Problems solved by technology

Although the strength and plasticity of particle-reinforced aluminum matrix composites can be significantly improved by traditional plastic deformation methods, such as extrusion, forging and rolling, but at the same time it will also increase the anisotropy inside the material, such as: along the extrusion The mechanical properties of the pressing direction are obviously higher than those perpendicular to the extrusion direction, and the physical properties of the two directions will also have certain differences; the mechanical properties along the forging radial direction or rolling direction are relatively high, and these differences are related to the material in the flow during plastic deformation

In the field of aerospace, for structural parts with complex forces under actual service conditions, the anisotropy of this material will greatly shorten their fatigue life, which seriously hinders the application of particle-reinforced aluminum matrix composites on such structural parts. development and application of

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