High-temperature oxidation behavior of TA15 aerospace titanium alloy at 500 ° C and 800 ° C

This study investigates the high-temperature oxidation behavior and performance of TA15 Ti alloy subjected to 500 and 800 degrees C service conditions. The oxidation process, microstructural evolution, mechanical property changes, and comprehensive performance were analyzed. At 500 degrees C, the alloy developed a distinctive bluecolored surface primarily composed of Ti 6 O, indicating a slow growth rate of the oxide layer. In contrast, the 800 degrees C condition led to severe oxidation with notable TiO 2 and Al 2 O 3 phases and extensive peeling of the oxidation layer. Microstructural analysis revealed that at 500 degrees C, there was minimal surface oxidation, and the microstructure showed a shallow heat-affected zone. At 800 degrees C, repeated oxidation and peeling cycles resulted in grain growth and a significant decrease in the beta -phase proportion. Mechanical property assessments indicated an increase in micro Vickers hardness at both temperatures, with the 800 degrees C sample exhibiting higher values. However, tensile strength decreased significantly at 800 degrees C due to the severe oxidation layer peeling, reducing the effective thickness during tensile testing. In summary, TA15 demonstrated good high-temperature service performance at 500 degrees C, while at 800 degrees C, severe oxidation and peeling adversely affected the overall performance. This research provides insights into the differential high-temperature behavior of TA15, crucial for applications in elevated temperature environments.