项目提出在铝熔体中原位合成热稳定性好的AlN、Al3BC等纳米粒子，并构筑三维网骨架结构，以大幅提高铝合金高温力学性能的新思路，研制出耐热高强铝合金材料新体系，满足现代发动机制造、航空航天和国防等领域轻量化发展和材料转型升级的紧迫需要。拟利用液态金属X射线衍射仪等分析手段，研究多相铝熔体中原位生成纳米粒子的前驱团簇演变与孪晶诱导纳米粒子网构筑机制；采用微聚焦X射线原位观测和三维表征技术，阐明粒子网骨架构成单元网胞的结构及其相互联结方式；基于三维网骨架中纳米粒子间的孪晶结合方式及高分辨原位表征手段，研究三维网骨架与铝基体间的界面结构及其调控机制；从网状三维结构、粒子与基体界面结构、载荷传递、骨架与基体协调变形、裂纹萌生与扩展及材料高温断裂失效模式等角度入手，揭示纳米粒子网对基体的高温强化机制。研究工作为高耐热高强铝合金新材料的研制提供理论支撑，具有重要的科学意义和应用价值。

In this work, a novel thinking is developed by in situ building a three-dimensional network structure consisted of thermal stability nano-particles like AlN, Al3BC synthesized in Al melts, aiming to significantly improve the elevated-temperature mechanical properties of aluminum alloys and meet the imperative requirement for engine manufacturing, aerospace, national defense etc. The evolution of precursor clusters during in-situ synthesizing nano particles and the forming principle of twin-induced three-dimensional network will be demonstrated, characterizing by liquid X-ray Diffraction. Utilizing micro focus X-ray radiography setup and three dimensional observations, the structure of net cell which is basic unit of the network and their mutual connection relationship will be illuminated. Based on in-situ high resolution characterization of the twin-bonding between nano particles in the network, the investigation and control of interface between the three-dimensional network structure and aluminum matrix will be conducted. Moreover, the strengthening mechanism of the network will be figured out by analyzing the network shape and deformation performance at elevated temperatures, particle/Al matrix interface structure, crack initiation and expansion, load transmitting and fracture failure modes at elevated temperatures. This work is regarded of great significance in both science and engineering, acting as a theoretical supporting for developing high-performance heat resistance light-metal based materials.