Microstructural characteristics and elevated temperature wear of Ti-11Si-16Al alloy

Abstract

Abstract The microstructural characteristics and elevated temperature wear behavior of a Ti-11Si-16Al alloy have been investigated, compared with the as-cast Al-free Ti – Si eutectic alloy. Experimental results show that addition of 16 at.% Al greatly modifies the microstructure by forming near-equiaxed Ti5Si3, rod-like Ti3Al and rosette-like eutectic cells distributing on a continuous α-Ti (Al, Si) solid solution phase. Therefore, mechanical properties such as Vickers' hardness, elastic modulus and strength are significantly improved. In-situ hot pressing and sintering of the hybrid oxide particles form a compact-and-hard glaze layer on the worn surface of the alloy. It has protective effects on the Ti-11Si-16Al specimen by relieving oxygen diffusion, alleviating rubbing of the counterpart and providing a solid lubricant effect with the hybrid oxide particles. This effectively improves the elevated temperature wear resistance and friction stability.