A preparation method of tib whisker reinforced titanium matrix composite with controllable orientation

Abstract

The invention relates to a preparation method of an orientation controllable TiB whisker reinforcement titanium-based composite material, and belongs to the field of metal-based composite materials. By combining the technologies of ball milling, discharge plasma low-temperature forming and discharge plasma thermal deformation, the optimal morphology of TiB whiskers reaching consistent orientationin the titanium-based composite material is effectively regulated. According to the method, deformation temperature and atmosphere can be controlled, the influence of adverse factors such as oxidationis omitted, deformation rate can be indirectly regulated by pressurization rate, the obtained TiB whiskers are high in length-diameter ratio and good in integrity, the TiB whiskers and titanium substrates have good interface bonding and coherency relationship, the substrates can be enhanced according to orientation factors and length-diameter ratio optimization in a load transfer mechanism, and the integrated mechanical performance of the composite material is remarkably improved. The preparation method sufficiently solves the problems that TiB whisker orientation is not easily regulated, means is single, the length-diameter ratio of the whiskers is low, additional thermal deformation equipment is needed, technology difficulty and cost are accordingly increased and the like.

Description

technical field [0001] The invention relates to a method for preparing a TiB whisker-reinforced titanium-based composite material with controllable orientation, and belongs to the field of metal-based composite materials. Background technique [0002] Titanium matrix composites (TMCs) are made of pure titanium or titanium alloy as the matrix and ceramic reinforcement phase (particles, whiskers, continuous fibers) as the reinforcement. Because titanium-based composite materials have high specific strength, specific stiffness, good wear resistance, high temperature resistance, low thermal expansion coefficient, non-magnetic and non-aging properties, they were first applied in the aerospace field and gradually applied to automobiles, Electronics, sporting goods, and biological devices expand. Therefore, titanium-based composites have attracted the attention of scientists in the field of materials at home and abroad. [0003] With the current common TiC, B 4 C, SiC, Ti 5 Si ...

AI Technical Summary

Problems solved by technology

Although the mechanical properties of the final material have been improved, the TiB whiskers are broken during the deformation process, and the aspect ratio is greatly reduced.

According to the formula mentioned above, the reduction of the aspect ratio of TiB whiskers will lead to a decrease in the load transfer strengthening effect of the reinforcement phase, thereby reducing the mechanical properties of the composite

Moreover, defects such as micropores and microcracks are prone to appear inside the titanium matrix during the rolling process, which will also adversely affect the mechanical properties of the composite material.

Therefore, it is difficult to maximize the strengthening effect of TiB whiskers by adjusting the orientation of TiB whiskers through conventional thermal deformation processing.

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