Rare earth nano high-strength titanium and preparation method thereof

Abstract

The invention discloses a preparation method of rare earth nano high-strength titanium. The preparation method comprises the following steps of adding rare earth yttrium into pure titanium, smelting in vacuum, and carrying out primary forging, secondary forging and heat treatment to obtain the rare earth nano high-strength titanium. According to the preparation method, the advantages of metal ultra-fine grains and nanocrystalline are effectively combined through the mechanisms of rare earth refining as-cast structure, rare earth phase strengthening high-temperature performance, severe plastic deformation and the like, and the rare earth nano high-strength titanium material of submicron and nanocrystalline scales is successfully prepared through medium-low temperature rapid large-deformation forging and low-temperature annealing processes. The preparation method is simple in process, low in investment, high in efficiency and good in effect.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a rare-earth nano-high-strength titanium, and in particular, to a preparation method of the rare-earth nano-high-strength titanium. Background technique [0002] Pure titanium has the characteristics of low density, high specific strength, high corrosion resistance, excellent biocompatibility, etc., and has been widely used in chemical, marine, biomedical and other fields. However, compared with titanium alloys and other commonly used engineering structural materials, such as automobile steel, die steel, stainless steel, etc., the strength of pure titanium is lower, only more than 300 MPa, which limits the application field. High alloying is the traditional way of strengthening pure titanium, but on the one hand, high alloying greatly increases the cost of materials, on the other hand, it also makes the processing of alloys more difficult, and the overall cost incre...

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Problems solved by technology

However, the severe plastic deformation technology pursues high-volume nanocrystals, which requires a large amount of deformation on the material, the size of the prepared sample is small, and the requirements for equipment and tooling are high, so it has not been promoted in actual production.

Furthermore, pure titanium is not only used in the normal room temperature working environment, but also in the high temperature environment of hundreds of degrees Celsius. The high-volume nanocrystals prepared by severe plastic deformation are easy to recover and grow, which greatly reduces the performance of the material and leads to failure.

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