A method of improving the damping performance of tc4 titanium alloy by magnetron sputtering surface treatment

Abstract

The invention discloses a technique for improving the damping performance of TC4 titanium alloy through magnetron sputtering surface treatment. The surface treatment of TC4 titanium alloy is carried out to improve the damping performance. Optimum sputtering process parameters to deposit surface films on TC4 samples to improve the damping properties of TC4 titanium alloys. In the invention, a thin film with a thickness of nanometer or micrometer order is formed on the surface of TC4 alloy through magnetron sputtering technology. The interface between the film and the substrate and dislocations near the interface are often the main source of damping in the film material, and energy can often be dissipated through the mechanism of dislocation damping during vibration. Comparing the damping performance of TC4 alloy after surface treatment with that of untreated TC4 alloy, the damping coefficient of TC4 alloy is 0.0034, and the damping coefficient of TC4 alloy can be effectively improved by magnetron sputtering surface treatment technology, so that the damping performance of TC4 alloy can be improved 3-5 times.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment functional materials, especially magnetron sputtering surface treatment. Background technique [0002] TC4 titanium alloy is a kind of α+β two-phase titanium alloy with medium mechanical strength. The transformation temperature between α phase and β phase is about 995°C. TC4 titanium alloy has good properties and excellent corrosion resistance. , small density, high specific strength, good toughness and weldability, etc., have been successfully applied in aerospace, petrochemical, shipbuilding, automobile, pharmaceutical and other departments. At present, TC4 titanium alloy is the most widely used Titanium alloy; In the field of aerospace, TC4 is widely used in the manufacture of aircraft engine fans, compressor discs and blades. The extremely critical load-bearing parts in the entire aircraft cabin structure such as the beam of the cabin fuselage, The frame and the joints in the ...

AI Technical Summary

Problems solved by technology

[0003] TC4 is a two-phase alloy, so its damping mechanism should be a multi-phase damping mechanism, that is, when the sample vibrates and deforms under load, the matrix α phase produces elastic deformation due to its high strength, and the strength of the dispersed phase β phase is relatively low. Plastic deformation will result in energy dissipation, resulting in a damping effect; however, although the strength of the β phase is relatively lower than that of the α phase in vibration, its strength is actually higher, so whether it is the α phase or the β phase during vibration Phase, the deformation of both is not obvious, and the energy dissipation is less, so TC4 has the disadvantage of low damping performance commonly found in titanium alloys; when the mechanical components are excited by the outside world, vibration and noise will be generated, and the broadband random The excitation will cause the multi-vibration peak effect of the structure, which will cause the failure of electronic devices and instrument parts; According to the event data, the failure caused by vibration has reached 60%; If the damping performance is too low, it cannot meet the increasingly serious vibration and noise problems; therefore, if the damping performance of TC4 titanium alloy is too low, it may directly cause the crash of the aircraft due to vibration. Improving the damping performance of TC4 through various material modification methods is to reduce its Necessary Study on Vibration Failure During Service

Images