Surface tension and viscosity of complex Ti-based industrial alloys are important for simulation of liquid assisted industrial processes such as casting, joining, crystal growth and infiltration. Modelling of the interface and mass transport during liquid-solid phase transition requires reliable surface tension and viscosity data. Therefore, to obtain accurate predictions of microstructural evolution during solidification related processes, only reliable input data are necessary. In the case of liquid Ti-Al alloys, the experimental difficulties related to high temperature measurements and reactivity of these alloys with supporting materials or containers as well as inevitable presence of oxygen may lead to data gaps including a complete lack of property data. An alternative for container-based methods are containerless processing techniques that offer a significant accuracy improvement and / or make possible to measure temperature and composition dependent thermophysical properties of metallic melts, as in the case of the Ti-Al-Cr-Nb system. Advanced mathematical models and computer simulations, developed in several theoretical frameworks, can be used to compensate the missing data; on the other side, for the validation of theoretical models, the experimental data are used. In the present work, an evaluation of the surface tension and viscosity of liquid Ti-Al-Cr-Nb alloys by means of the predictive models and a comparison to the available experimental data were done. The proposed methodology is a tool to assess the reliability of thermophysical properties data of multicomponent alloy systems.

复杂钛基工业合金的表面张力和粘度对于铸造、连接、晶体生长和渗透等液体辅助工业过程的模拟非常重要。液固相变过程中的界面和质量传递建模需要可靠的表面张力和粘度数据。因此，为了获得凝固相关过程中微观结构演变的准确预测，只需要可靠的输入数据。就液态钛铝合金而言，与高温测量和这些合金与支撑材料或容器的反应性以及不可避免的氧气存在相关的实验困难可能会导致数据差距，包括完全缺乏性能数据。基于容器的方法的替代方案是无容器加工技术，它可以显着提高精度和/或可以测量金属熔体的温度和成分相关的热物理性质，如 Ti-Al-Cr-Nb 系统的情况。在多个理论框架中开发的高级数学模型和计算机模拟可用于补偿缺失的数据；另一方面，为了验证理论模型，使用实验数据。在目前的工作中，通过预测模型评估了液态 Ti-Al-Cr-Nb 合金的表面张力和粘度，并与现有实验数据进行了比较。所提出的方法是评估多元合金系统热物理性能数据可靠性的工具。