An investigation on oxidation wear mechanisms of Ti–46Al–7Nb–0.7Cr–0.1Si–0.2Ni intermetallic-based alloys

The results of investigation on oxidation wear mechanism of Ti–46Al–7Nb–0.7Cr–0.1Si–0.2Ni-based intermetallic alloy are presented. Oxidation was carried out in air at temperatures: 900 °C, 925 °C and 975 °C taking into account the micro-geometry of surfaces being heated and oxidized. It was determined that the rise of surface roughness to Ra = 5.8 μm definitely reduces scale of chipping in higher temperature (975 °C). Investigation of the material structure of the specimen and chemical composition of oxidation products was performed. Possibilities of an increase in the heat resistance of the tested alloy by means of application of high roughness surfaces were shown.