先用高温X射线衍射仪获取含金属间化合物的合金（如Ag-In/Ag-Sn/In-Bi合金）熔体的原子团簇统计结构参数，再用上海光源所同步辐射设备，对合金熔体的原子团簇结构信息进行局域结构剖析试验。分别以Ag、Sn、In、Bi元素为吸收原子，通过分析X射线吸收精细结构谱，获取熔体中指定原子的最近邻配位原子种类、数目和配位键长等结构参数；以吸收原子为中心，剖析统计团簇结构，建立特征原子的局域结构模型；分析吸收谱近边电子结构，揭示熔体局域结构演化的本质。研究熔体特征原子的局域结构对短程有序团簇结构构成和稳定性的影响，探索局域结构对团簇演变的作用，分别研究它们对合金凝固过程及微观结构形成的贡献，为材料加工过程液固结构转变的研究和组织控制提供更微观和更具体的理论依据，增强对凝固理论的再认识和新理解，丰富凝聚态物理理论。

With the high temperature X ray diffractometer, the statistic short-range order (SRO) structure parameters of the alloy systems containing intermetallic (e.g. Ag-In/Ag-Sn/In-Bi) in the melt state will be obtained. Based on these results, the local structure of these alloy melts will be detected by means of synchrotron radiation equipment in Shanghai Synchrotron Radiation Facility. Through the analysis of X ray absorption fine structure spectrum with the absorption atoms of Ag, Sn, In, and Bi elements, respectively, we shall obtain the coordination elements, the coordination numbers and the bond length around the specified atoms. Centered on the absorption atoms, we shall dissect the clusters' structure, and establish the local structure models. Combined with the analysis of electronic structures from the near edge, we shall further uncover the nature of the local structure evolution. Furthermore, we shall research the effects of the local structure on the constitutions and stabilities of the clusters, discover the role of the local structure in the cluster evolution, and study the contribution of the local structure to the solidification processes and the as-solidified microstructures, respectively. This research work will provide more microscopic and detailed theory evidences for studying and controlling the liquid-solid structure, enhance the recognition and new understanding toward the solidification theory, and enrich the condensed matter physics theory.