Studies on Creep and Wear Behavior of Mo-40Ti-10Si Alloy Prepared by Hot Pressing

The present study deals with the development and characterization of a Mo-Ti-Si alloy by pressure-assisted sintering for high-temperature applications. The three-phase alloy was found to be consisted of (Mo,Ti)3Si-type silicide and discontinuous Mo-rich and Ti-rich α-(Mo, Ti)ss phases. The alloy was characterized for mechanical properties, creep, and wear behavior. Elastic modulus and hardness of all the constituent phases were determined using nanoindentation technique. Creep properties of the alloy determined from the compression creep tests in vacuum were found to be better than the single-phase Mo5Si3 and Ti5Si3 at the tested temperature of 1000 °C. The coefficient of friction values were found to be 0.59, 0.55 and 0.4 at the testing loads of 10, 15 and 20 N, respectively, at 10 Hz frequency in reciprocal testing mode at room temperature, while 0.42 at 500 °C with a load of 15 N. The dominant wear mechanism was proposed based on the wear scar analysis.