Graphene-reinforced high-silicon aluminum-based composite material and preparation method thereof

Abstract

The invention relates to a graphene-reinforced high-silicon aluminum-based composite material and a preparation method thereof. The composite material is prepared from the components in percentage bymass: 15.0 to 20.0 percent of silicon, 2.0 to 4.0 percent of copper, 0.5 to 1.0 percent of magnesium, 0.05 to 0.07 percent of titanium, 0.02 to 0.05 percent of boron, 0.3 to 0.6 percent of graphene, and the balance aluminum. The preparation method comprises the steps of (1) mixing the raw material components under gas protection to obtain alloy powder; (2) compacting the alloy powder into a massive sintered blank, and vacuum sintering to obtain a sintered blank; and (3) aiming at different silicon contents, quenching and tempering, or multi-directionally forging and annealing, and obtaining the graphene-reinforced high-silicon aluminum-based composite material. According to the method provided by the invention, reinforced-phase particles are distributed more uniformly, a large number of dislocations are produced in the material, dislocation cells are broken into sub grains or fine grains, and the fine grains are strengthened; the tensile strength is improved to be more than 400MPa; andmeanwhile, the yield strength of the material is improved to be more than 236MPa.

Description

technical field [0001] The invention relates to the field of graphene application technology, in particular to a graphene-reinforced high-silicon-aluminum matrix composite material and a preparation method thereof. Background technique [0002] Aluminum-silicon composite materials have the advantages of high specific strength and specific stiffness, low thermal expansion coefficient, good wear resistance and volume stability, and high enough high temperature strength, and are widely used in aerospace and automobile manufacturing industries. When the silicon content exceeds 12.6% of the Al-Si eutectic point, although the strength is further improved, due to the increased size and irregular shape of the silicon particles embedded in the matrix, the matrix is ​​severely split, and stress is formed at the tip of the silicon phase. Concentration reduces the tensile strength of the material and deteriorates the machinability of the material. At present, the silicon content of com...

AI Technical Summary

Problems solved by technology

When the silicon content exceeds 12.6% of the Al-Si eutectic point, although the strength is further improved, due to the increased size and irregular shape of the silicon particles embedded in the matrix, the matrix is ​​severely split, and stress is formed at the tip of the silicon phase. Concentration reduces the tensile strength of the material and deteriorates the machinability of the material

At present, the silicon content of commonly used aluminum-silicon-based composite materials is basically lower than that of eutectic components. The reinforcements of aluminum-silicon-based composite materials are mainly divided into particle reinforcement and fiber reinforcement, but their production costs are high, and particle reinforcement and fiber reinforcement are used. Potential for further strengthening aluminum matrix composites dwindling

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