纳米多孔金属材料具有极高的比表面积和表面活性，为许多应用领域的候选材料，如化学催化剂、激励与传感器、微纳器件、能源存储与转换以及组织工程领域。本项目借助球差矫正电镜、超高速直接探测相机，结合原子分辨率原位变形样品台，定量化研究应力、应变作用下纳米多孔金属结构演变和相关力学行为的尺寸效应的原子机制。研究内容包括：1）纳米多孔金属脆韧化转变的原子机制；2）位错机制在纳米多孔金属变形过程中的尺寸效应；3）纳米多孔表面扩散蠕变的原子机制；4）不同种类面心立方结构纳米多孔金属的塑性变形机制。该项目对发现纳米多孔金属材料塑性变形新现象、提出新概念意义重大，为该类材料从科学研究转入工程实际应用提供可靠的实验数据和基础理论支撑。

Nanoporous metals (NPMs) with high specific surface area and surface activity have recently attracted significant interest due to potential applications in various technological fields such as catalysis, sensors and actuators, energy harvesting and storage, and optics. This project is aimed to in virtue of aberration correction transmission electron microscopy (Cs-corrected TEM) and Gatan K2 Ultra-high speed direct detection camera, and combination of in-situ atomic-scale mechanical microscopy technique, to quantitatively study the atomic mechanisms of the size effect of microstructural evolution and related mechanical behaviors of NPMs. The research includes: 1) the brittle-to-ductile transition mechanisms of NPM at atomic scale; 2) the size effect of dislocation mechanisms during elastic-plastic deformation; 3) surface atomic diffusion and creep mechanisms of NPM. 4) the different plastic deformation mechanisms for various face-centered-cubic NPMs. This project is believed to reveal the novel phenomena and generate new concepts in the field of NPMs, and further provide reliable experimental data and theoretical foundation, to promote scientific research into the practical engineering applications.