Improvement Of Wear Resistance Of Zirconium-titanium Alloys By Anodic Oxidation And Boronizing

Titanium(Ti)and titanium alloys have broad application prospects in aerospace,shipbuilding and chemical industry due to their advantages of high specific strength,low density and excellent corrosion resistance.Our research group successfully developed a new ZrTiAlV series alloy by replacing part of Ti in TC4 alloy with Zr,taking advantage of the infinite mutual solubility of zirconium and titanium.Among the various failure modes of metal materials,the loss caused by wear failure is as much as half.Based on the poor wear resistance of titanium alloy,this paper studied the friction and wear resistance of ZrTiAlV alloy,and the improvement of wear resistance of ZrTiAlV alloy through anodic oxidation and boronizing treatment process.A series of ZrTiAlV quaternary alloys with a certain gradient of zirconium contents were prepared by vacuum non-consumable arc melting furnace.The friction and wear experiments were carried out under different load conditions.The results show that the hardness of the alloy first increases and then decreases with the increase of zirconium content,the friction coefficient of the alloy first decreases and then increases with the increase of zirconium content,and the wear first decreases and then increases.ZrTiAlV alloys with zirconium content of 30%-40%wt.exhibit the highest surface hardness,lowest friction coefficient and lowest wear rate.This series of ZrTiAlV alloys were treated by anodization,and the microstructure and component structure of the treated alloy surface were characterized to study the behavior of friction and wear,observe the surface morphology of the alloy after wear and analyze the wear mechanism.The results show that ZrTiAlV alloy can obtain regular nanopore by anodization,and the increase of zirconium content and oxidation time can increase the thickness of the oxide.The friction coefficient can be reduced by anodizing the alloy surface.The forged Ti-30Zr-6Al-4V alloy was selected for boronizing treatment on the surface of the alloy,and the phase composition and microstructure of the treated alloy surface were characterized.Friction and wear experiments under selected loads were carried out to study the behavior of friction and wear and analyze the wear mechanism by observing the surface morphology of the alloy after wear.The results show that the surface hardness and wear resistance of Ti-30Zr-6Al-4V alloy can be improved by boronizing.