预熔化相变在一系列具有极高应用价值的重要物理现象中扮演着核心角色，如形核、烧结、液态金属致脆和铸件热裂等。应用原子模拟技术研究预熔化相变在过去三十年中取得了巨大进步。然而，这些进步局限于固汽界面和固固界面的预熔化相变研究。本项目旨在先驱性地开展固液界面体系预熔化相变的原子模拟与计算研究。我们拟针对铝铅固液界面这一具有代表性的异质固液界面体系，定量研究该界面预熔化的发生机理，探索随温度、界面方向、界面微观结构、界面形状及界面合金浓度的变化规律，以及研究预熔化对该合金材料应用的一项重要影响。本项目研究的开展将为界面相变理论新的发展提供重要数据。

Premelting plays a central role in a number of technologically important phenomena, such as nucleation, sintering, liquid-metal embrittlement and hot tears during casting. Significant progress has been realized over the past three decades in the application of atomistic simulations to the studies of premelting. However, such progress is limited in the studies of the solid-vapor and solid-solid interfacial premelting. The current proposal is aimed at carrying out pioneering simulation and computational studies on the solid-liquid interfacial premelting. We propose to target the new developments of the methods for detecting premelting precursors, to be applicable in the investigations on the onset mechanism for chemically heterogeneous alloy solid-liquid interfacial premelting. The proposed work will also involve the quantitatively studies into the relationships between the premelting and temperature, interfacial orientation, interfacial atomistic structure, interfacial shape and interfacial alloy solute concentration, for an illustrative and representative chemically heterogeneous Al-Pb solid-liquid interfacial system. As well as the investigation into one significant impact of the premelting on the application of such alloy. The proposed research will provide essential data to facilitate the new advancements of the interfacial thermodynamics.