| Abstract Scope |
TiAlTa Alloys are well known for their lightweight, heat resistance, and mechanical strength in high-temperature applications, such as aerospace and defense systems. To examine and optimize the performance of alloys at elevated temperatures, we investigate the mechanical and oxidation behavior of TiAlTa alloys with varying titanium content (from 30 to 70 at%). In this talk, we focus on 33Ti-33Al-33Ta, 50Ti-25Al-25Ta, and 70Ti-15Al-15Ta alloys, utilizing characterization techniques such as x-ray diffraction (XRD), nanoindentation tests, and weight gain analysis. It should be noted that the nanoindentation tests were conducted on samples from room temperature to 750°C. The indentation results indicate that both the 33Ti-33Al-33Ta and 70Ti-15Al-15Ta alloys exhibit higher elastic modulus compared to the 50Ti-25Al-25Ta alloy at room temperature. Additionally, weight gain analysis shows that the 50Ti-25Al-25Ta alloy displays the poorest oxidation resistance at 750°C. X-ray photoelectron spectroscopy (XPS) further identifies TiO2 as the primary oxide formed on the surface of the 50Ti-25Al-25Ta alloy, contrasting with the formation of Al2O3 on the other two alloys. These findings highlight the significant impact of Ti additions on both the mechanical and oxidation properties of TiAlTa alloys, providing valuable insights for the design of optimized alloys tailored for aviation and aerospace applications. |