Equiaxed nanocrystalline Ti6Al4V-Mn alloy with high thermal stability and preparation method of equiaxed nanocrystalline Ti6Al4V-Mn alloy

Abstract

The invention relates to the field of titanium alloy materials, in particular to an isometric nanocrystalline Ti6Al4V-Mn alloy with high thermal stability and a preparation method of the isometric nanocrystalline Ti6Al4V-Mn alloy. The titanium alloy comprises, by weight, 5.0-7.0% of Al, 3.0-5.0% of V, 0.01-5.0% of Mn, and the balance Ti. The preparation method of the titanium alloy comprises the following steps that 1, after heat preservation is conducted for a period of time at the temperature of 950 DEG C or above, the titanium alloy is rapidly cooled to the room temperature to obtain a nanometer lath precursor; and 2, the nano lath precursor is subjected to thermal deformation within the temperature range of 650-850 DEG C and the strain rate range of 0.1-5s<-1>, the total dependent variable is greater than or equal to 70%, and the nano lath precursor is converted into an isometric nanocrystalline structure. The prepared nanocrystalline Ti6Al4V-Mn alloy with the high thermal stability has excellent comprehensive mechanical properties, and can be widely applied to a plurality of important fields of aerospace, biomedical treatment, petrochemical engineering, automobile industry andocean engineering.

Description

technical field [0001] The invention relates to the field of titanium alloy materials, in particular to an equiaxed nanocrystalline Ti6Al4V-Mn 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 prep...

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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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