Cyclic oxidation behavior of Al–Cu–Fe–Cr quasicrystalline coating on titanium alloy

The Al–Cu–Fe–Cr quasicrystalline coating was deposited by low pressure plasma spraying (LPPS). Formation of Al–Cu–Fe–Cr quasicrystalline phase is closely related to annealing temperature. As-deposited Al–Cu–Fe–Cr coating is a kind of mixtures of quasicrystalline and crystalline phases. With increasing heat treatment temperature, icosahedral phase initially is increased and then decreased, the amount of crystalline phases is decreased and the amount of decagonal quasicrystalline phase is increased. Al–Cu–Fe–Cr quasicrystalline coating improved the cyclic oxidation resistance of titanium-based alloys. The weight gains at 650 and 800 °C for Al–Cu–Fe–Cr quasicrystalline coating are very low. During the oxidation period there is no evident spallation of the coating from the substrate. Oxide formed on the surface of Al–Cu–Fe–Cr quasicrystalline coating after oxidation consisted of Al2O3.