Layered aluminum alloy/aluminum-based composite board and preparation method thereof

Abstract

The invention belongs to the field of metal material preparation, and particularly relates to a layered aluminum alloy / aluminum-based composite board and a preparation method thereof. The preparation method specifically comprises the following steps that magnesium nitride powder is uniformly dispersed between aluminum alloy plates subjected to surface roughening treatment, the stacked plates are subjected to vacuum hot pressing to generate AlN in situ through a replacement reaction, the bonding strength and the bonding quality between the plates are improved, the plates are rolled to refine grains, the dislocation density and the grain boundary number in the materials are improved, the effect of improving the mechanical property of the material is achieved, and then low-temperature annealing is carried out to remove residual stress, so that the material has better comprehensive mechanical properties; and then the obtained plate is cut into two pieces with the same size. The prepared layered aluminum-based composite material plate is good in interface bonding, internal defects introduced in the rolling process are reduced to the maximum extent, and the material has good strength and plasticity.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a layered aluminum alloy / aluminum matrix composite plate and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloy materials are widely used in industry. The density of aluminum itself is small, only 2.7g / cm3, which is about 1 / 3 of copper or steel. It has excellent comprehensive properties, high specific strength, good plasticity and processing performance. Widely used in aerospace, automobiles, bridges, construction, energy and power, metallurgy and chemical industry, machinery manufacturing and other fields. However, industrial pure aluminum has disadvantages such as low strength, active chemical properties, and easy formation of oxide layer on the surface, which seriously limits its application range. Compared with pure aluminum materials, aluminum matrix composite materials have better high temperature resistance, wear ...

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Problems solved by technology

However, there are the following problems in the process of accumulative stack rolling: 1. The interfacial bonding of materials is unstable. As the number of stacked rolling increases, the number of interfaces increases, and there is a probability that the bonding is not tight, and the interfacial gap will greatly reduce the material properties; 2. The stacked metal plates are fixed together with metal wires or rivets, and the air can circulate between the joint surfaces before rolling. Sometimes, in order to improve the plastic deformation ability of the plates, preheating treatment is carried out before rolling. During this process, metal aluminum and other easily oxidized metals The formation of an oxide layer on the surface of the bonding surface affects the quality of the interface bond and the properties of the material; the surface of the material is oxidized due to the temperature rise of the rolling and then enters the interior of the material after the next rolling, and the thickening of the internal oxide layer has a negative impact on the material properties

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