Al-Co-Cr-Cu-Nb-Si-Ti-V multi-principal element alloy and method for surface treatment for titanium alloy thereof

Abstract

The invention discloses an Al-Co-Cr-Cu-Nb-Si-Ti-V multi-principal element alloy and a method for surface treatment for a titanium alloy thereof. The alloy is composed of, by molecular fraction, 12-20 parts of V, 12-20 parts of Cr, 12-20 parts of Al, 12-20 parts of Si, 12-20 parts of Cu, 1-10 parts of Ti, 10-18 parts of Co and 10-18 parts of Nb. The method comprises the steps that a titanium alloy substrate is cleaned and subjected to abrasive blasting roughening, multi-principal element alloy powder is sprayed on the surface of the titanium alloy substrate through plasma spraying equipment, and finally the plasma-sprayed surface is subjected to remelting treatment through a CO2 laser. The multi-principal element alloy coating prepared through the method makes use of the characteristics such as the high-entropy effect, the slow diffusion effect, the nanophase strengthening, severe crystal lattice distortion and the 'Cocktail party effect' of the multi-principal element alloy, the abrasion resistance and the high temperature oxidation resistance of the titanium alloy are significantly improved, and titanium fire is prevented.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment and strengthening, and in particular relates to an Al-Co-Cr-Cu-Nb-Si-Ti-V multi-principal alloy and a method for treating the surface of a titanium alloy. Background technique [0002] Titanium and titanium alloys have the advantages of low specific gravity, high specific strength, high yield ratio, strong corrosion resistance and good mechanical properties under high temperature conditions, and are gradually being used in many fields. However, due to the high friction coefficient and large fluctuations of titanium alloys, poor wear resistance, low oxidation resistance after reaching a certain temperature, easy to be ignited, and the flame has a tendency to spread spontaneously, these problems make it more widely used. limit. Since most of these problems of titanium alloys are not caused by the overall properties of the material, but are mainly related to the surface properti...

AI Technical Summary

Problems solved by technology

Technologies such as micro-arc oxidation, plasma spraying, supersonic spraying, ion implantation, electron beam deposition, laser nitriding, and double-layer glow ionization can be applied to the surface modification of titanium alloys; however, although these technologies are improving the surface of titanium alloys Some effects have been achieved in terms of friction and wear, high temperature oxidation, flame retardancy, etc., but these surface technologies also have their own limitations, such as thin coating layer, poor impact resistance, or weak combination with the substrate, or Significantly reduce the fatigue performance of the matrix and other shortcomings, which cannot meet the current needs, so it is necessary to develop coating materials and preparation technologies with higher performance