Microstructure and High Temperature Oxidation Resistance of Modified Aluminide Layer on γ-TiAl Alloy Surface by Powder Packing Cementation Method

The surface modified aluminide layer on γ-TiAl alloy was prepared by powder packing cementation method. The surface morphology, element distribution and phase composition of the modified layer were tested and analyzed. The high-temperature oxidation behaviors of modified aluminide layer at 850 ℃ in static air were studied in experiment. The results show that the aluminized layer was uniform and compact, had no obvious penetrating cracks and consisted of TiAl3. The modified layer after oxidation at 850 ℃ in static air for 100 h was mainly composed of Al2O3, TiAl3, TiAl2 phases. The high temperature oxidation resistance of γ-TiAl alloy was improved obviously due to the modified aluminide layer.