多层级纳米多孔金属的结构设计和力学性能表征

本项目拟以基于结构转变而实现功能拓展的目标为出发点，通过开展纳米多孔金属的微结构设计，实现力学性能的可控调节和优化。选择三类多层级纳米多孔金属及合金作为研究对象，探索微结构的形成原理与演化规律，改良工艺以实现可控制备；进行各类材料基本力学性能表征；基于纳米尺度3D数值重构技术，开展特征几何缺陷统计分析和原位力学测试，明确其微观变形机制以及制备缺陷形成和影响规律；结合跨尺度有限元、分子动力学仿真，建立基于典型缺陷的纳米多孔金属设计及性能分析平台；最终确立微结构及典型缺陷特征与力学性能间的内在联系，提炼出性能优化的可行途径，构建新型多层次纳米多孔金属的力学特性调控体系，为挖掘潜在功能化应用提供指引。

To expand functional applications of nanoporous metals, this project aims to achieve the controllable adjustment and optimization of mechanical properties by microstructure design. Choosing three types of heterogeneous nanoporous metals and nanoporous alloys as research subject, this project develops the design of different microstructure, and looks into their forming and evolving law, as well as their controllable preparation and process improvement; Characterize the basic mechanical properties; Perform the nanoscale 3D reconstruction, statistical analysis of typical defects, and in-situ tomographic mechanical test; Establish the relationship between characteristics of microstructure/typical defects and mechanical properties; Construct the design and performance analysis platform of typical defect characteristics, by using the trans-scale simulations with finite element and molecular dynamics; Illustrate the effect trend of microstructure/defects on mechanical properties and their in-depth relationships; Build the feasible way to optimize the performance so as to provide the guidance for exploring potential functional applications of nanoporous.