Anisotropy of the solid liquid interface and its effect on heterogeneous nucleation in aluminium-based melts

对于非均相成核过程的建模和理解，所涉及的界面能的精确知识是必不可少的。特别是，描述熔体与固体相互作用的固液界面能是非常重要的。一般来说，它很大程度上取决于衬底的晶体取向。本项目的目的是研究液态Al-Ni和Cu-Ni合金与固体惰性非金属或非惰性金属单晶衬底接触时的各向异性。界面能将通过固滴法作为温度、合金成分和晶体取向的函数来测量。我们的结果将根据热力学模型计算来讨论。它们不仅是验证蒙特卡罗和分子动力学模拟的实验基础，而且还将与相场模拟的相应结果进行比较。

For modelling and understanding of heterogeneous nucleation processes, the precise knowledge of the involved interfacial energies is essential. In particular, the solid-liquid interfacial energy, which describes the interaction of a melt with a solid, is of great importance. Generally, it strongly depends on the crystallographic orientation of the substrate. It is the goal of this project to study this anisotropy of liquid Al-Ni and Cu-Ni alloys being in contact with solid inert non-metallic or non-inert metallic single crystalline substrates. The interfacial energies will be measured by means of the sessile drop method as a function of temperature, alloy composition, and crystallographic orientation. Our results will be discussed in terms of thermodynamic model calculations. They are not only the experimental basis for the verification of Monte Carlo- and Molecular Dynamics simulations, they will also be compared with corresponding results of phase field simulations.