Method for regulating and controlling preparation of in situ binary nanoparticle enhanced aluminum based composite material

Abstract

The invention relates to an in situ binary nanoparticle enhanced aluminum based composite material, in particular to a method for regulating and controlling the preparation of the in situ binary nanoparticle enhanced aluminum based composite material. A melt direct reaction method is used for preparing the binary nanoparticle enhanced aluminum based composite material; the aluminum alloy melting process uses mechanical stirring; rare earth middleintermediate alloy is added; through mechanical stirring, the melt generates vortex; the rare earth intermediatemiddle alloy is fast dispersed into the melt; in addition, the melt temperature can be more uniform. In the reaction process, an acoustic magnetic coupling field is exerted; through sound flow movement in two different directions, the uniform distribution of the enhanced particles in the metal melt in the whole melt is ensured; an ultrasonic field is exerted in the semi-solidified state; the continuous growth of the particles can be effectively inhibited, so that the distribution is more uniform; the prepared composite material is subjected to solid dissolution reinforcement through heat treatment, so that the grain particle dimension is smaller; the nanometer particles realize the scattered distribution in the crystals and on the crystal boundary; in addition, the particle and substrate interfaces are pure and achieves pollution-free effects; finally, the in-situ aluminum-based composite material is obtained.

Description

technical field [0001] The invention relates to an in-situ binary nanoparticle-reinforced aluminum-based composite material, in particular to a method for regulating and preparing the in-situ binary nanoparticle-reinforced aluminum-based composite material. Background technique [0002] Due to its high elastic modulus, high strength and excellent corrosion resistance, particle reinforced aluminum matrix composites are widely used in aviation, aerospace, advanced weapons, automobile industry, precision instruments and other fields and other civil industries. These particle reinforcements play an important role in improving the performance of aluminum matrix composites. Generally speaking, when the content of reinforcing particles in the composite material is the same, the strengthening effect of nanoparticles is better than that of microparticles. In nanoparticle-reinforced aluminum matrix composites, the surface of the reinforcing particles is highly active, and the active i...

AI Technical Summary

Problems solved by technology

However, there are three disadvantages in the preparation process of in-situ binary composites: (1) The nanoparticle size is small, and the specific surface area effect is very obvious, which makes it easier for the particles to agglomerate and is difficult to disperse in the aluminum melt.

(2) The reaction temperature is high and the reaction time is long, which makes it difficult for the particles to reach the nanometer size

(3) The wettability of particles and matrix is ​​poor, and the yield of binary nanoparticles is low

[0003] At present, it is commonly used to introduce a single external field in the reaction process to regulate and improve its deficiencies. Chinese patent: CN102994814 A (date of invention: 2013.3.27, name of invention: a mixed particle reinforced wear-resistant aluminum matrix composite material generated in situ under a magnetic field and its Preparation method) proposes a preparation method of mixed particle reinforced wear-resistant aluminum matrix composites generated in situ under a single magnetic field. However, when a single magnetic field is applied, due to the insurmountable skin effect of the electromagnetic field in the metal melt, the magnetic field The action strength in the metal decays according to the exponential law, so the effective action depth of the magnetic field on the melt is limited; Chinese patent: CN 102943223 A (invention date: 2013.2.27, invention name: an aluminum matrix composite with high thermal conductivity under the ultrasonic field The preparation method of the material) provides a preparation method of the high thermal conductivity material under the ultrasonic field

However, when the metal melt is under the action of the ultrasonic field alone, the cavitation bubbles mainly exist near the horn, and the ultrasonic acoustic flow can only ensure that the cavitation bubbles move along the axial direction of the horn to the depth of the molten aluminum, which means Causes non-uniform distribution of cavitation bubbles throughout the metal melt

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