A kind of aluminum-titanium aluminum intermetallic compound-alumina composite material and its preparation method and application

Abstract

The invention discloses an aluminum-titanium aluminum intermetallic compound-aluminum oxide composite material and a preparing method and application thereof. Firstly, nano TiO2 particles and an aluminum sheet are subjected to accumulative pack rolling into an Al-TiO2 composite material prefabricated body; then, the Al-TiO2 composite material prefabricated body is arranged in the high-temperatureand high-pressure condition, the in-situ chemical reaction is induced, and TiAl3 and Al2O3 mixed particles are generated; and then, a sample is heated to the temperature at the aluminum melting pointor above, heat extrusion treatment is conducted, and a final Al-TiAl3-Al2O3 composite material is obtained. According to the technology, the low initial TiO2 particle volume fraction is utilized, through the chemical reaction of Al-TiO2 and aluminum selective heat extrusion, the content of target particles is greatly adjusted, the total volume fraction of generated TiAl3 particles and Al2O3 particles is 3.6-9.9 times of the initial TiO2 particle volume fraction, the microscopic structure is fine, and particle distribution is uniform. The prepared Al-TiAl3-Al2O3 composite material is excellentin mechanical performance, the hardness reaches up to 532.8HV to the maximum degree and is 21.7 times of the hardness of pure aluminum, the room-temperature compression strength reaches up to 1311.9 MPa to the maximum degree, the compression strength reaches up to 918.6 MPa to the maximum degree at 300 DEG C, the compression strength reaches up to 564.6 MPa to the maximum degree at 600 DEG C, andthe compression strength is 225.2 MPa at 700 DEG C.

Description

technical field [0001] The invention relates to an aluminum-titanium aluminum intermetallic compound-alumina composite material and a preparation method and application thereof, belonging to the field of composite material preparation. Background technique [0002] With the development of industry and science and technology, the application of material properties in practical situations is becoming more and more important, and the requirements and standards are getting higher and higher, especially in cutting-edge fields such as aerospace and military. It is gradually difficult for single metals and alloys to meet the actual requirements, which leads to the rapid and rapid development of metal matrix composites. Compared with traditional pure metal and alloy materials, metal matrix composites can not only play a coordinated role between matrix and reinforcement, but also adjust the type and content of matrix and reinforcement to obtain materials with different properties acc...

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Problems solved by technology

The problems existing in these preparation methods are: TiAl in the obtained composite materials 3 particles and Al 2 o 3 The particle content is low, which affects the improvement of material performance; the original TiO 2 When there are many nanoparticles, it is difficult to disperse, and it is easy to cause agglomeration, which in turn leads to the formation of new TiAl 3 Particles and Al 2 o 3 Particle agglomeration reduces material properties; high cost severely limits process development and further optimization

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