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Ti 3 Al alloy coating doped with Cr and Nb was designed and synthesized  in situ  on a Ti-6Al-4V substrate using laser technology. Cracking of the coating was reduced by the addition of a certain amount of elemental Cr and Nb. Isothermal oxidation behavior of the coating was investigated. Oxidation kinetic curves of coatings followed the parabolic as a whole and linear parabolic laws at 700 °C and 800 °C for 240 hours, respectively. The oxide scale of the coating remained dense and complete throughout the oxidation stage, which was composed of a mixture of Al 2 O 3  and TiO 2  in the outermost layer, Al 2 O 3  rich in the secondary external layer, and Al 2 O 3  and TiO 2  alternating layers in the inner layer. The addition of elemental Nb can enhance the oxidation resistance by reducing the oxygen-vacancy concentration. Combined with thermodynamic and kinetic factors, the oxidation process and mechanism of coatings were analyzed and discussed  .

High-temperature oxidation behaviour of laser in situ synthesised Ti-Al-Cr-Nb alloy coating on Ti-6Al-4V