Friction surfacing of ti alloy with Stir squeeze casted al b4c nano Composite

Abstract

Titanium alloys are widely used in the universe. This titanium alloys newlineare metals that contain a mixture of titanium and other chemical elements. newlineSuch alloys have very high tensile strength and toughness even at extreme newlinetemperatures. Ti-6Al-4V alloy is an alpha-beta titanium alloy with a high newlinestrength-to-weight ratio and excellent corrosion resistance and is extensively newlineused in the aerospace applications. Unfortunately, titanium and its alloys newlinehave found little use in general engineering applications as they suffer from newlinepoor wear resistance. Protecting titanium alloys with a coating is an newlineappropriate solution to improve its wear resistance. newlineIn general, titanium has greater affinity for oxygen, nitrogen and newlinehydrogen and hence those gases induce cracking in fusion coating processes newlinedue to high temperature and more dilution. Dilution of coating materials newlinecauses formation of intermetallic compounds in the interface in fusion newlinecoating and also titanium is highly prone to sensitization and promotes pores, newlinepin holes and shrinkage cavities. To overcome those problems solid state newlinesurfacing is the best suitable process. Friction Surfacing (FS) is a relatively newlinenovel solid state technology which is capable of producing coatings with newlinelesser dilution and good metallurgical bonding and FS is a potential candidate newlinefor surfacing of Titanium alloys. FS is based on the viscoplastic deformation newlineof mechatrode (consumable rod) and metallic bonding between the coating newlineand the substrate at high pressure and temperature. Superior quality surfacing newlinewill be obtained by FS compared to the techniques which are presently newlineexplored. newline