Method for preparing alumina particle reinforced aluminum matrix composite

Abstract

The invention discloses a method for preparing an alumina particle reinforced aluminum matrix composite. The method comprises the steps that aluminum matrix composites of which the roll bonding times are different are obtained through the accumulative roll bonding method at first, and the aluminum matrix composites contain alumina particle reinforcement bodies with different volume fractions; and then, the sample is processed by adopting the follow-up discharge plasma sintering technology, so that the alumina particle reinforced aluminum matrix composite is successfully prepared. The composite obtained through the method is compact and good in bonding condition and contains the reinforcement bodies which have high volume fractions and are dispersed in distribution and small in particle, and the composite has a good comprehensive performance. Alumina particle reinforced aluminum matrix composites with different performances can be obtained by adjusting the accumulative roll bonding times, the reinforcement body volume fractions and other parameters. According to the method adopted by the invention, needed equipment is simple, the cost is low, operation is easy and convenient, and industrialized production is easy.

Description

technical field [0001] The invention relates to a method for preparing alumina particle-reinforced aluminum-matrix composite materials, in particular to a method for preparing alumina particle-reinforced aluminum-matrix composite materials by cumulative rolling and discharge plasma sintering technology, and belongs to the field of composite material preparation. Background technique [0002] Aluminum matrix composites are generally metal matrix composites composed of aluminum and its alloys as the continuous phase, and particles, whiskers, continuous long fibers or short fibers as the second reinforcing phase. Aluminum matrix composites rely on their ① high specific strength and high specific modulus; ② wear resistance; ③ good high temperature performance; ④ excellent electrical and thermal conductivity; ⑤ good dimensional stability and small linear expansion coefficient; Properties such as toughness and fracture toughness have gradually come to the fore in many fields such ...

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Problems solved by technology

Among them, the liquid casting method has high production efficiency and low cost, but it is prone to agglomeration when adding reinforcement particles with a size between 1 and 2 and violent stirring may cause oxidation of the aluminum-based melt and inhalation of air

The preparation of aluminum matrix composites by powder metallurgy is complex and expensive; the production cycle is long; there are certain difficulties in the manufacture of large-sized components; there are voids, segregation and other defects in the manufactured materials, and it is difficult to achieve the best combination of properties

Severe plastic deformation method refers to the processing technology that imposes extremely high plastic strain on the material to form an ultra-fine grain structure mainly containing high-angle grain boundaries. This method is limited by the plasticity of the sample and requires high equipment, and the obtained sample has poor plasticity. and other problems, and the preparation cost is high, it is difficult to be used in large-scale industrial production

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