TiZr基非晶熔体与Ti合金的界面特征和熔体层结构

Interfacial characteristics and microstructure of molten layer of TiZr-based metallic glass melt and Ti-based alloy

为研究TiZr基非晶熔体与Ti基合金之间的两相交互作用，明确非晶复合材料中两相平衡的控制因素及调控规律，利用改进的液桥方法，设计5组不同保温温度的液桥实验，其中保温温度分别为700、750、800、850和900 ℃，通过此实验研究温度对两相界面特征及熔体层结构的影响。结果表明：界面处的基片发生溶解，且溶解深度随着温度的升高而增大，受重力影响，上基片溶解量略低于下基片的；两相之间具有良好的成分稳定性，溶解进入合金熔体的Ti基合金保持成分基本不变以枝晶的形态析出。随基片溶解量增大，熔体中析出的枝晶相的体积分数增加，且枝晶相含量随着离界面距离的增加逐渐减小。

In order to study the interaction between TiZr-based metallic glass melt and Ti-based alloy, and confirm the factors that control the two-phase equilibrium in bulk metallic glass composite, the effects of temperature on the interfacial characteristics and the microstructure of molten layer were studied at 700, 750, 800, 850 and 900 ℃, respectively, by using the modified liquid-bridge method. The interfacial characteristic was studied by scanning electron microscopy （SEM） and the microstructure of molten layer was analyzed by X-ray diffractometry （XRD）. The results show that the substrate dissolves and its dissolution depth increases in accordance with temperature increasing. As the effect of convection, the dissolution depth of the lower substrate is higher than that of the upper one. TiZr-based metallic glass and Ti-based alloy show good componential stability. The Ti-based alloy which dissolves into the TiZr-based metallic glass melt can maintain its chemical components and precipitates in dendrite morphology. Besides, the volume fraction of dendrites in the molten layer increases with temperature and declines with increasing the distance from the interface.