Equiaxial nanocrystalline Ti6Al4V-Co alloy with high thermal stability and preparation method of equiaxial nanocrystalline Ti6Al4V-Co alloy

Abstract

The invention relates to the field of titanium alloy materials, in particular to an equiaxial nanocrystalline Ti6Al4V-Co alloy with high thermal stability and a preparation method of the equiaxial nanocrystalline Ti6Al4V-Co alloy. The titanium alloy comprises the following chemical components in percentage by weight: 5.0-7.0% of Al; 3.0-5.0% of V; 0.01-7.2% of Co; and the balance of Ti. The preparation method of the titanium alloy comprises the following steps: firstly, after heat preservation is conducted for a period of time at the temperature of 900 DEG C or above, rapidly cooling the titanium alloy to room temperature to obtain a nanometer lath precursor; and then, carrying out thermal deformation on the nanometer lath precursor within the temperature range of 700-850 DEG C and the strain rate range of 0.1-4 s<-1>, wherein total dependent variable is larger than or equal to 60%, and the nanometer lath precursor is converted into an equiaxial nanocrystalline structure. The preparednanocrystalline Ti6Al4V-Co alloy with high thermal stability has excellent comprehensive mechanical properties, and can be widely applied to many important fields of aerospace, biomedical treatment, petrochemical engineering, automobile industry, ocean engineering and the like.

Description

Technical field[0001]The invention relates to the field of titanium alloy materials, in particular to an equiaxed nanocrystalline Ti6Al4V-Co alloy with high thermal stability and a preparation method thereof.Background technique[0002]Titanium alloys are widely used in important fields such as aerospace, biomedicine, petrochemical industry, automobile industry and marine engineering due to their high strength, low density, excellent corrosion resistance and good biocompatibility. With the rapid development of economic technology in recent years, it is necessary to develop new titanium alloy materials with higher performance. Compared with the traditional coarse-grained titanium alloy, nanocrystalline titanium alloy has higher strength and plasticity, greater fatigue strength, high temperature superplasticity and other excellent comprehensive mechanical properties. At the same time, it also has good wear resistance and excellent Biocompatibility and many unique physical and chemical p...

AI Technical Summary

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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