A dual-phase in-situ nano-reinforced titanium-based composite material and its preparation method

Abstract

The invention discloses a two-phase in-situ nano-reinforced titanium-based composite material and a preparation method thereof. The preparation method is based on the in-situ reaction characteristics between titanium / aluminum and titanium / silicon, and utilizes the laser selective melting manufacturing technology, through the high-energy laser beam High temperature induction, promotes the chemical interaction between titanium / aluminum and titanium / silicon, and generates Ti in situ 3 Al and Ti 5 Si 3 Nano-reinforced phase; through the optimization of process conditions, the flow characteristics of the nano-reinforced phase in the micro-area molten pool are adjusted to promote the uniform dispersion of the nano-reinforced phase in the titanium alloy matrix, and then obtain Ti 3 Al and Ti 5 Si 3 Two-phase nanoceramic in situ dispersion reinforced titanium matrix composites. The preparation method of the present invention has simple process and low cost, is conducive to forming a good ceramic / titanium alloy metallurgical bonding interface, and significantly enhances the wetting performance of the ceramic / titanium alloy interface; at the same time, the double nano The reinforcing phase can effectively improve the comprehensive performance of titanium matrix composites.

Description

technical field [0001] The invention relates to a high-performance titanium-based nano-composite material and a preparation method thereof, in particular to a two-phase in-situ nano-reinforced titanium-based composite material and a preparation method thereof. [0002] technical background [0003] Due to its low density, high specific strength, strong corrosion resistance, and good biocompatibility, titanium alloys are widely used in aviation, aerospace, shipbuilding and ocean engineering, and biomedicine. However, a single titanium alloy is difficult to meet the application requirements. Ceramic particles have high hardness, high strength, and excellent wear resistance and corrosion resistance. They are ideal reinforcements for titanium-based composite materials, which can significantly improve the specific strength, wear resistance and other service performance of titanium alloys. Among them, nano-ceramic particles have large specific surface area, excellent mechanical pr...

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Problems solved by technology

The external addition method mainly has the following deficiencies: (1) the reinforcement phase particles are pre-made, and the size is relatively large, and the nano-ceramic particles are usually easy to agglomerate and difficult to effectively disperse; (2) the nano-ceramic reinforcement has strong activity and is easy to disperse. Contaminated, thereby reducing the wettability with the titanium alloy melt; (3) Compared with micron ceramic particles, the cost of nano ceramic particles is higher

These methods have enhanced the wetting performance between ceramics and titanium alloy substrates to a certain extent, but there are also the following technical difficulties: (1) Generally, ceramics generated by means of in-situ reactions require higher processing temperatures, especially double The formation of nano-phase ceramic particles is more likely to cause high forming temperature, high mold cost, and large energy consumption brought by traditional preparation processes such as smelting and powder metallurgy; (2) The existing preparation processes such as vacuum smelting and powder metallurgy only rely on macroscopic Mechanical or electromagnetic agitation, it is difficult to effectively disperse the nano-ceramic reinforcement phase generated in situ, and it is easy to bring about the agglomeration of ceramic phases and coarse grains, resulting in a decline in material performance; (3) a single preparation process such as melting casting or powder metallurgy, etc. It is impossible to obtain products that match the size, shape and performance, and usually requires secondary forming (extrusion, forging, etc.) At the same time, with the introduction of highly brittle ceramic particles, the deformation resistance increases sharply, high temperature deformation is prone to local plastic rheology, it is difficult to form components with complex geometric structures, and the thermal secondary processing of titanium matrix composites is significantly increased. difficulty

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