Wear-resistant gradient interface complex-phase reinforced titanium alloy material and preparation method thereof

Abstract

The invention discloses a wear-resistant gradient interface complex-phase reinforced titanium alloy material and a preparation method thereof. The wear-resistant gradient interface complex-phase reinforced titanium alloy material comprises a titanium alloy matrix, and a TiC ceramic reinforced phase and a TiN ceramic reinforced phase which are dispersed in the titanium alloy matrix; the titanium alloy matrix is a titanium-aluminum-molybdenum-vanadium-zirconium alloy, 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.% and the balance is Ti; the TiC ceramic reinforced phase accounts for 10-15wt.% of the total mass of the alloy material; and the TiN ceramic reinforced phase accounts for 10-15wt.% of the total mass of the alloy material. Titanium-aluminum-molybdenum-vanadium-zirconium alloy powder and micron-sized TiC and TiN powder serve as raw materials, the ceramic reinforced titanium-based composite material is prepared through a selective laser melting technology after ball milling and powder mixing are carried out, a TiC-Ti (C, N) -TiN gradient interface structure is formed, interface bonding between the ceramic reinforced phases and the titanium matrix is improved, the tendency that the composite material cracks due to stress concentration in the melt rapid condensation process is reduced, cracks in the formed titanium-based composite material are reduced, and the forming quality and the mechanical property of the titanium-based composite material are improved.

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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