States of Aggregation - Clustering, Segregation, Nucleation and Nanostructure

高强度轻质合金是一种纳米结构材料，其力学性能是由合金成分和热机械加工控制的强化析出相在纳米尺度上的分散而产生的。原子探针场离子显微镜和高分辨率电子显微镜将结合起来研究沉淀相形成之前的溶质原子聚集。高空间分辨率的实验研究将得到弹性应变能计算和聚集行为的第一性原理模拟的补充，以确定其在控制降水过程中的作用，从而确定其性质。这项工作将为改进合金设计提供基础，为高性能合金的计算机辅助设计提供平台。

High strength light alloys are nanostructured materials, deriving their mechanical properties from nanoscale dispersions of strengthening precipitate phases controlled by alloy composition and thermomechanical processing. Atom-probe field-ion microscopy and high-resolution electron microscopy will be combined to study the aggregation of solute atoms that precedes formation of the precipitate phases. Experimental studies at high spatial resolution will be complemented by elastic strain energy calculations and first-principles modelling of the aggregation behaviour, to define its role in controlling precipitation processes and thus properties. The work will provide a basis for improved alloy design and a platform for computer-aided design of high-performance alloys.