Interfacial reactions and oxidation behavior of Al2O3 and Al2O3/Al coatings on an orthorhombic Ti2AlNb alloy

▶ The interfacial reactions of Al2O3/Ti2AlNb and Al2O3/Al/Ti2AlNb specimens at 750 °C were investigated. ▶ The Al2O3/Al/Ti2AlNb specimens exhibited excellent oxidation resistance at 750 °C. ▶ No internal oxidation or oxygen and nitrogen dissolved zone could be observed in the coated alloy with Al2O3/Al coating.