The influence of selected parameters on the course of cyclic oxidation of Ti-46A1-7Nb

The paper presents testing results of cyclic oxidation of Ti-46A1-7Nb based intermetallic alloy taking into account the effect of temperature, surface roughness and the cooling rate of temperature. Oxidation was carried out in air at the temperature between 875°C and 975°C. It was determined that in case of conventional preparation of the surface by grinding to low Ra value (in the research Ra~0,06žm), distinct scale chipping was present at the temperature of 950°C and above. The rise of surface roughness to R,:~6žm results in mass increase in case of oxidation in the temperature of 900°C, whereas it definitely reduces scale chipping in higher temperatures (925°C, 975°C). A slightly higher mass increase of the oxidised alloy including rise of the cooling rate were also determined.