Response of Tribological Behaviors to Microstructural Characteristics of Ti-40Al-10V Alloy at High Temperatures

Ti-40Al-10 V alloys with nearly lamellar structure (HIPed) and refined (B2+gamma) microstructure (HT) were used to investigate the correlation between tribological behavior and microstructural characteristics at elevated temperatures. Results showed that owing to high ratios of TiO2/Al2O3, the HIPed samples presented low friction coefficients at high temperatures. As for the wear rates at 400 degrees C, due to the differences in grain size and 7 phase content, a delamination of discontinuous oxide film occurred in the HIPed sample, while oxide film closely adhered to the HT sample, leading to an improved wear resistance in the HT samples. At 800 degrees C, the wear rate of HT alloys was higher than that of HIPed samples because of obvious plastic deformation in HT samples.