研究了稀土元素钇(Y)对Ti Ti5Si3共晶合金的微合金化作用。微观组织分析表明,添加微量Y,可以改变原始钛硅合金的共晶团形态和组织形貌。适量Y的加入(原子比0.025%),不仅使共晶团中粗大的Ti5Si3相颗粒明显细化和钝化,而且合金的微观组织也更加均匀。合金的室温压缩塑性和强度也得到了有效提高。稀土元素Y对钛硅合金的作用,很可能是因为Y原子替代了Ti5Si3相中的部分Si原子,形成硅化物Ti5(Si,Y)3所致。 The effect of rare earth element yttrium (Y) on the microalloying of Ti Ti5Si3 eutectic alloy was studied. Microstructure analysis shows that the addition of trace amount of Y can change the morphology and morphology of the original titanium-silicon alloy. Appropriate amount of Y added (atomic ratio 0.025%), not only the eutectic coarse Ti5Si3 phase particles were significantly refined and passivated, and the alloy microstructure is more uniform. The room temperature compression plasticity and strength of the alloy have also been effectively improved. The effect of the rare earth element Y on the titanium-silicon alloy is probably because the Y atom replaces part of the Si atoms in the Ti5Si3 phase to form the silicide Ti5 (Si, Y) 3.