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.
Equilibria E 4000Experimental Study of Ti-Sn-Y System Phase Equilibria at 473 K -The 473 K isothermal section of the title system consists of 13 single-phase regions, 23 two-phase regions, and 11 three-phase regions. The existence of 10 binary compounds is confirmed. No ternary compound is detected. -(ZHAN*, Y.; HE, L.; MA, J.; SUN, Z.; ZHANG, G.; ZHUANG, Y.; J.
As promising candidates for new high-temperature structural materials, Ti – Si eutectic alloys are required for the next generation of advanced aircraft engines. In this paper, microstructures of the Ti – Si eutectic alloys with various Cr contents were investigated by means of X-ray diffraction, scanning electron microscopy and light optical microscopy. The results show that with the increase of Cr content up to 9 wt.%, β-Ti (Si, Cr)ss matrix and Ti5Si3 form in the as cast alloy, however, the α-Ti (Si, Cr)ss phase disappears. Cr element solute in β-Ti and Ti5Si3 can significantly change the morphology and distribution of Ti5Si3 intermetallic phase. This greatly affects the fracture behavior and mechanical properties of as-cast Ti – Si eutectic alloys.
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