The effects of substrate temperature during the low-power plasma spraying (2.5~8.0kW) and subsequent annealing on the phase transformation of Al-Cu-Cr quasicrystalline coatings were investigated. Compared with the original powder mainly composed of icosahedral I-Al65Cu24Cr11 quasicrystalline phase and monoclinic θ-Al13Cr4, the coatings show an icosahedral quasicrystal I-Al65Cu24Cr11 and its body-centered cubic approximate phase α-Al69Cu18Cr13. XRD patterns indicated that, for identical spraying condition, a rise in substrate temperature resulted in an increase of the I/α peak intensity ratio in the coatings, and the crystalline phases of AlCu4 and Al86Cr14 were observed in the coatings after annealing at 1113K for half an hour.

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