A wear-resistant gradient interface multiphase reinforced titanium alloy material and its preparation method

Abstract

The invention discloses a wear-resistant gradient interface multiphase reinforced titanium alloy material and a preparation method thereof, comprising a titanium alloy matrix and a TiC ceramic reinforcement phase and a TiN ceramic reinforcement phase dispersed in the titanium alloy matrix; the titanium alloy matrix is ​​titanium- Aluminum-molybdenum-vanadium-zirconium alloy, wherein the content of aluminum is 5.5-6.5wt.%, the content of zirconium is 1.6-2.0wt.%, the content of molybdenum is 1.0-1.5wt.%, the content of vanadium is 1.0-1.8wt.%. The amount is Ti; the TiC ceramic reinforcement phase accounts for 10-15 wt.% of the total mass of the alloy material; the TiN ceramic reinforcement phase accounts for 10-15 wt.% of the total alloy material mass. Using titanium-aluminum-molybdenum-vanadium-zirconium alloy powder and micron-sized TiC and TiN powder as raw materials, the ceramic-reinforced titanium-based composite material is prepared by selective laser melting technology after ball milling and mixing powder to form TiC-Ti(C,N)- The gradient interface structure of TiN improves the interface bonding between the ceramic reinforcement phase and the titanium matrix, reduces the tendency of stress concentration and cracking of the composite material during the rapid condensation of the melt, reduces the cracks in the titanium matrix composite material after forming, and improves its performance. Forming quality and mechanical properties.

Description

technical field [0001] The invention belongs to the field of ceramic-reinforced titanium-based composite materials, in particular to a wear-resistant gradient interface multi-phase reinforced titanium alloy material and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, good corrosion resistance and strong biocompatibility, and is widely used in aerospace, automobile, medical and other fields. However, the hardness of titanium alloys is generally low (generally no more than 350HV 0.2 ), the wear resistance is poor, which seriously limits its application range, and cannot meet the needs of the rapidly developing high-tech fields such as aerospace, electronics and automobile manufacturing. In order to overcome the above shortcomings, it is expected to improve the hardness and wear resistance of the matrix by compounding high-modulus, high-strength, and high-hardness ceramic reinforcements ...

AI Technical Summary

Problems solved by technology

However, a single reinforcing phase is currently used. When the content of the reinforcing phase is large, the viscosity of the liquid phase increases during the forming process, and the fluidity becomes poor. The ceramic particles cannot be evenly distributed, forming a relatively coarse dendrite structure, and poor interface bonding, cracking, etc. problems, resulting in poor part form quality

[0003] From the perspective of processing technology, there are many methods for preparing ceramic-reinforced titanium matrix composites, such as melting and casting, powder metallurgy, self-propagating high-temperature synthesis, mechanical alloying, etc., but the relationship between the ceramic phase and the metal matrix is ​​due to the composition, crystal Due to the differences in structure and physical and chemical properties, it is easy to have defects such as uneven distribution of ceramic reinforcements, difficult control of size and shape, poor bonding between ceramic reinforcements and the matrix interface, resulting in poor overall performance of composite materials.

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