本项目拟采用液态金属结构分析仪与熔体热物理性质测试仪等手段，并结合模拟计算，研究Al-Si-X-P系合金熔体AlP团簇的结构演变、吸附效应及其不稳定性。系统研究AlP团簇的构型及结构演变，揭示AlP团簇的吸附效应，即AlP团簇对Al-Si-X-P系合金熔体结构、熔体热物理性质、熔体形核和晶体生长过程的影响机制，提出AlP团簇对Si相形核及生长的吸附机理。研究合金熔体成分、熔体状态及外来界面对AlP团簇结构稳定性的影响，提出导致该团簇不稳定性的激发条件。研制弥散AlP型Al-P系晶种合金，提出绿色、高温性能稳定化工艺，解决Al-Si-X-P系合金高温性能不稳定的难题。开展该项研究有利于拓宽液态金属结构的研究领域，揭示痕迹量元素构成的典型团簇对合金熔体凝固的显著影响及磷变质初晶Si的机理，为工业条件下稳定控制熔体处理过程，提高凝固组织与性能的稳定性提供理论依据。

The project is proposed to investigate the adsorption effect, structural evolution and instability of AlP clusters in Al-Si-X-P alloy melts through measurements of liquid metal structures (X-ray diffraction, etc.) and thermophysical properties of alloy melts combined with theoretical simulations. We will systematically study the geometrical configurations and structural evolution of AlP clusters and especially their adsorption function, and the influences of them on melt structures, thermophysical properties and solidification process of Al-Si-X-P alloys in order to reveal the adsorption mechanism of AlP clusters during the nucleation and growth of Si phase. The influences of alloy compositions, melt states and foreign substrates on the structural stability of AlP clusters will also be investigated, in order to establish the excitation conditions resulting in the instability of AlP clusters. Meanwhile, series of Al-P based alloys with dispersive AlP microcrystals/nanoclusters and an environmentally friendly modifying technology with elevated temperature stabilization will be developed to get over the instability problem of Al-Si-X-P alloys at high temperatures. This project is beneficial to broaden the research field of liquid metal structures, further understand the significant influence of typical clusters which are composed of trace elements on the alloy solidification and to reveal the deep modification mechanisms of Si by AlP. Thus, it will provide theoretical basis for controlling the melt treatment process and improving the stability of favorable solidification microstucture and properties in industrial conditions.