Effect of coatings on oxidation resistance and mechanical performance of Ti60 alloy

The effect of several sputtered coatings on oxidation resistance and mechanical performance of Ti60 alloy was investigated. Sputtered pure Al, Ti–36Al, Ni–16Cr–2.5Al(wt%) coatings and reactively-sputtered Al2O3 film were effective in inhibiting the oxidation and oxygen-embrittlement of Ti60 alloy at 600–700°C, while Al2O3 and TiAl coatings exhibited a better effect than Al and NiCrAl coatings from the point of view of coating-substrate compatibility. The tensile test after 100h exposure at 600°C in air also showed that Ti60 alloy with Al2O3 and TiAl coatings exhibited a higher ductility than that with Al and NiCrAl coatings, which exhibited a good correlation with coating-substrate compatibility.