Manufacturing method of metal matrix nanocomposites with high toughness

Abstract

The invention relates to the composite technical field, in particular to a manufacturing method of metal matrix nanocomposites with high toughness. According to the manufacturing method, the size, distribution, interface structure of reinforcement bodies and the metal matrix micro-structure are effectively controlled by the combined composite process of twice ball-milling, discharging plasma in situ reaction sintering and the large strain plastic deformation technology, so that ultra-fine grain metal matrix composites with evenly distributed in situ authigenic nanoparticles and good interface combination are manufactured, and good matching of intensity and toughness is obtained.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of a high-strength and tough metal-based nanocomposite material. Background technique [0002] Metal matrix composites have the advantages of high specific strength, specific stiffness, low thermal expansion coefficient, and low cost, and have broad application prospects in the automotive industry, aerospace, and military industries; however, the introduction of reinforcements seriously reduces the material's Plasticity and toughness limit its practical application. [0003] The performance of metal matrix composites is closely related to the properties of the reinforcement (type, shape, size and distribution), the reinforcement-metal matrix interface structure, and the microstructure of the matrix; the introduction of reinforcement mainly includes external addition and in-situ self-generation. Two, compared with the former, the reinfo...

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Problems solved by technology

[0002] Metal matrix composites have the advantages of high specific strength, specific stiffness, low thermal expansion coefficient, and low cost, and have broad application prospects in the automotive industry, aerospace, and military industries; however, the introduction of reinforcements seriously reduces the material's Plasticity and toughness, which limit its practical application

[0003] The performance of metal matrix composites is closely related to the properties of the reinforcement (type, shape, size and distribution), the reinforcement-metal matrix interface structure, and the microstructure of the matrix; the introduction of reinforcement mainly includes external addition and in-situ self-generation. Two, compared with the former, the reinforcement obtained by the latter has better compatibility with the matrix, which has become a hot spot in the research of metal matrix composites in recent years; TM In-situ reaction generation method, combustion synthesis, reaction spray deposition and other in-situ preparation methods; however, the average size of reinforcements generated by most of the existing methods is relatively large, and the size distribution is not uniform, which seriously affects the improvement of material properties , compared with coarse-grained reinforcements, nanoscale reinforcements can better match the strength and toughness of metal matrix composites. Therefore, controlling the size of reinforcements is an important factor for the preparation of high-strength and tough composites. In addition to reinforcements, now The matrix microstructure of the metal matrix composites prepared by the preparation method is also relatively coarse, which cannot effectively obtain a good match between strength and toughness. It can be seen that obtaining ultrafine-grained metal matrix composites reinforced by in-situ self-generated nanoparticles is at the same time An Effective Way to Realize High Strength and High Toughness