Aluminum-based alloy containing nano Ti2AlN particles and preparation method thereof

Abstract

The invention provides an aluminum-based alloy containing nano Ti2AlN particles and a preparation method thereof. The aluminum-based alloy containing the nano Ti2AlN particles comprises a nanoscale Ti2AlN particle phase and an Al matrix, wherein the nanoscale Ti2AlN particle phase is dispersedly distributed in the Al matrix; and the Ti2AlN particles can play a role in refining aluminum grains andstrengthening the aluminum matrix at the same time. According to the preparation method provided by the invention, the melt reaction is adopted for in-situ synthesis of the nanoscale Ti2AlN particles,so that the reaction can be carried out at a lower temperature, the problem that reactants are easy to oxidize is solved, the nanoscale Ti2AlN particles can play roles in refining the aluminum grainsand strengthening the aluminum matrix at the same time, and the aluminum-based alloy containing the nano Ti2AlN particles and the preparation method thereof have a good industrial application prospect.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a 2 Aluminum-based alloy of AlN particles and its preparation method. Background technique [0002] As-cast grain refinement of aluminum and its alloys has always been one of the hot issues in the field of solidification. At present, the as-cast grain refinement method with the simplest and most convenient process and the most excellent effect is to add Al-Ti-B and Al-Ti-C grain refiners to the melt, and use boride or carbide particles to , to promote α-Al heterogeneous nucleation and achieve grain refinement. However, when the Al-Ti-B grain refiner is used to refine the grains of aluminum alloys containing Zr, Cr and other elements, there is a phenomenon of "poisoning" of refinement, and the refinement effect is obviously attenuated; Al-Ti-C grains Although the refiner does not have the above problems, the stability of TiC particles in the aluminum melt is poor, and it is easy ...

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Problems solved by technology

[0006] But there is following deficiency in above-mentioned patent: Ti 2 AlN synthesis methods mainly include hot pressing sintering method, hot isostatic pressing method, spark plasma sintering, high temperature self-propagating method, etc. The above patents all use hot pressing sintering method to prepare Ti 2 AlN often requires high temperatures above 1400°C and high pressure conditions above hundreds of atmospheres, the reactants are easily oxidized, and it is difficult to produce on a large scale; and because the synthesis reaction is a high-temperature and high-pressure reaction, the resulting Ti with sharp corners 2 AlN particles are basically on the order of a few microns to tens of microns; Ti of this size and shape 2 If AlN particles are used as the heterogeneous nucleation particles of α-Al and the strengthening phase of the aluminum matrix, they will become the source of cracks and have a negative effect on the improvement of material properties

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