Molding method of graphene composite aluminum-based material casting

Abstract

The invention relates to a molding method of a graphene composite aluminum-based material casting, and aims to solve the problems of poor graphene dispersion effect, high difficulty in directly molding complex-shape products and the like in the existing method of the graphene composite aluminum-based material casting. The graphene composite aluminum-based material casting is made by preparation ofmixed particles through surface treatment of rod-like aluminum alloy particles, high-temperature pressing, semi-solid smelting and direct extrusion-casing-molding. The molding method is advanced in process, and accurate and detailed in data. The obtained graphene composite aluminum-based material casting has the advantages of high internal organization denseness, freeness from the defects of shrinkage cavities and looseness, round and fine crystal grains, uniform dispersion of graphene in a substrate, good interface bonding effect, tensile strength of the casting being up to 366MPa, ductilityof 5.3 percent and hardness of 106HV. The molding method is an advanced molding method of the graphene composite aluminum-based material casting.

Description

technical field [0001] The invention relates to a molding method of a graphene composite aluminum-based material casting, which belongs to the technical field of nonferrous metal composite casting molding. Background technique [0002] Graphene has excellent mechanical properties and unique structural characteristics, adding it to the aluminum alloy matrix can play the role of load transfer; and graphene as a heterogeneous nucleation can effectively refine the grain structure; at the same time, graphene can The movement of dislocations inside the matrix is ​​hindered, and the dislocations are concentrated around the graphene, thereby improving the yield strength of the composite material. Therefore, the addition of graphene is expected to greatly improve the mechanical properties of the aluminum alloy matrix. [0003] The current preparation methods of graphene composite aluminum-based materials mainly include friction stir method, powder metallurgy method, hot pressing sin...

AI Technical Summary

Problems solved by technology

The friction stir method has low preparation efficiency and poor graphene dispersion effect, and the aluminum-based material can be obtained in local areas only after repeated friction stir processing; the powder metallurgy method can achieve a relatively uniform dispersion of graphene in the matrix, but the prepared There are many pores and cracks inside the aluminum-based material, and the bonding performance between graphene and the substrate is poor; the hot-pressing sintering method can produce a high-density aluminum-based material, but the preparation process is complicated, the equipment cost is high, and the energy consumption is large; Graphene in aluminum-based materials prepared by volume infiltration method is easy to agglomerate and easily form brittle carbides, resulting in a decrease in the mechanical properties of aluminum-based materials.

At the same time, the above method can prepare graphene-composite aluminum-based materials, but it is difficult to directly form products with complex shapes. Therefore, it is necessary to develop a new molding method for graphene-composite aluminum-based material castings

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