A kind of equiaxed nanocrystalline ti-zr-ni alloy with high thermal stability and preparation method thereof

Abstract

The invention relates to the field of titanium alloy materials, in particular to an equiaxed nanocrystalline Ti-Zr-Ni alloy with high thermal stability and a preparation method thereof. The chemical composition of the titanium alloy is as follows (% by weight): Zr: 12.0-18.0; Ni: 0.01-5.0; the balance is Ti. The preparation method of the titanium alloy is as follows: firstly, after keeping the temperature above 870°C for a period of time, it is rapidly cooled to room temperature to obtain the nano-slab precursor; ~4s ‑1 The thermal deformation is carried out within a certain range, and the total strain is greater than or equal to 70%, so that the nano-slab precursor is transformed into an equiaxed nanocrystalline structure. The nanocrystalline Ti-Zr-Ni alloy with high thermal stability prepared by the invention has excellent comprehensive mechanical properties and can be widely used in many important fields such as aerospace, biomedicine, petrochemical industry, automobile industry and marine engineering.

Description

technical field [0001] The invention relates to the field of titanium alloy materials, in particular to an equiaxed nanocrystalline Ti-Zr-Ni alloy with high thermal stability and a preparation method thereof. Background technique [0002] Due to its high strength, low density, excellent corrosion resistance and good biocompatibility, titanium alloys are widely used in important fields such as aerospace, biomedical, petrochemical, automotive and marine engineering. With the rapid development of economy and technology in recent years, it is necessary to develop new titanium alloy materials with higher performance. Compared with traditional coarse-grained titanium alloys, nanocrystalline titanium alloys have excellent comprehensive mechanical properties such as higher strength and plasticity, greater fatigue strength, and high-temperature superplasticity. Biocompatibility and many unique physical and chemical properties are very attractive in practical applications. The prepar...

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Problems solved by technology

Common large plastic deformation methods include equal channel angular extrusion (ECAP), cumulative composite rolling (ARB), multidirectional forging (MF) and high pressure torsion (HPT), etc., all of which require high-power equipment and expensive molds , the size of the prepared material is also small, which cannot meet the needs of large-scale industrial production

In addition, the microstructure thermal stability of nanocrystalline metal materials is another important bottleneck restricting its application and development.

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