Novel high-strength aluminum alloy particle reinforced aluminum matrix composite material and preparation method thereof

Abstract

The invention belongs to the technical field of composite material preparation, and particularly relates to a novel high-strength aluminum alloy particle reinforced aluminum matrix composite materialand a preparation method thereof. A reinforced phase of the novel high-strength aluminum alloy particle reinforced aluminum matrix composite material is particles of aluminum alloy with the tensile strength larger than 480 MPa, a matrix is pure aluminum, and after step-by-step grinding, mixing and isostatic cool pressing forming, the aluminum matrix composite material is synthesized through a microwave pressure sintering method. According to the novel high-strength aluminum alloy particle reinforced aluminum matrix composite material and the preparation method thereof, the particle matrix interface is provided with a metal / metal interface, the interface strength is high; the thermal expansion performance of the particles are similar to the thermal expansion performance of aluminum, finished material holes are reduced, the material compactness is further improved; the material is easier to compact; a microwave pressurization method is adopted to inhibit grain growth in the sintering process, the micro-nano scale characteristics of reinforced particles are kept, fine grain strengthening is advantageously brought into play; in addition, atomic diffusion between the particles and the matrix and brittle phase generation at the interface are reduced, the interface strengthening effect is advantageously brought into play; and the prepared composite material has high density and good microstructure, and the comprehensive mechanical property of the material is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a novel high-strength aluminum alloy particle reinforced aluminum matrix composite material and a preparation method thereof. Background technique [0002] High-strength aluminum alloys refer to aluminum alloys whose tensile strength is greater than 480MPa, mainly based on Al-Cu-Mg and Al-Zn-Mg-Cu, namely 2XXX hard aluminum alloys and 7XXX superhard aluminum alloys. The static strength of the former is slightly lower than that of the latter, but the service temperature is higher than that of the latter. Due to the different chemical composition, melting and solidification methods, processing technology and heat treatment system of the alloy, the performance of the alloy varies greatly. The highest strength of 7090 aluminum alloy in North America is 855MPa, the strength of European aluminum alloy is 840MPa, the strength of Japanese aluminum allo...

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Problems solved by technology

However, since most of the reinforced particles are mostly ceramic particles, and the addition of ceramic particles has obvious disadvantages, as the patent application CN 110153408A reports a method for preparing a particle-reinforced aluminum matrix composite material, the ceramic particles exist between the ceramic particles and the aluminum alloy melt The wettability of the ceramic particles, especially the high-content ceramic particles, is difficult to add. It is often necessary to pretreat the ceramic particles, or use auxiliary means such as ultrasonic waves and vacuum, which complicates the process and increases the cost.

Patent application CN 110153408A reports a preparation method of a ceramic particle reinforced 6XXX aluminum matrix composite material. Since the composite material introduces a large number of interfaces after the particles are added, the existence of a large number of interfaces will lead to segregation and abnormal diffusion of elements in the alloy, and then The strengthening efficiency of the particles is significantly reduced, and the strengthening efficiency = (composite material performance - matrix performance) / matrix performance

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