离子辐照与LBE交互作用下FeCrAl合金表面氧化层演化机理研究

铅冷快堆（LFR）是第四代先进核能系统最具发展潜力的堆型之一，但是，高温辐照环境下LBE与结构材料的相容性问题成为制约LFR发展的重要瓶颈之一。研究表明在结构材料表面形成致密稳定的氧化层可以有效阻止铅铋的侵蚀，延长材料的服役寿命。然而辐照/LBE腐蚀交互作用使得结构材料界面微观结构演化过程更加复杂，将显著影响材料表面保护性氧化层的形成和稳定性。本项目针对辐照/LBE腐蚀交互作用对材料表面耐腐蚀氧化层演化机理的影响这一重要科学问题，选择性能优异的FeCrAl合金材料为研究对象，依托兰州重离子加速器提供的高能离子束和HLMIF装置开展实验，研究离子辐照与LBE交互作用下材料表面氧化层形成的动力学规律，揭示交互作用下材料内部微结构的演化过程和表面氧化层的形成过程及其机理，并对FeCrAl材料耐腐蚀行为进行综合评价和预测，为解决铅基堆研发面临的材料问题提供重要的科学依据和必要的数据支持。

Despite lead cooled fast reactor (LFR) is one of the most promising advanced nuclear power systems of the fourth generation, the compatibility of LBE with structural materials under environment of high temperature and irradiation has become one of the bottlenecks for the development the of LFR. The formation of a dense and stable oxide layer on the surface of structural materials shows a hope that it effectively cuts down the corrosion of LBE and prolongs the service life of the structural material. However, the interaction of irradiation/LBE corrosion which makes the microstructure evolution process of the interface between LBE and structural material more complicated, will significantly affect the formation and stability of the oxide layer. This project will be aimed at the important scientific problem of "the influence of irradiation/LBE corrosion interaction on the evolution mechanism of corrosion resistant oxide layer on the surface of materials ". FeCrAl alloy, a promising candidate structural material, is selected as the research object. The experiment of will be carried out on irradiation/LBE corrosion synergistic action device which relies on Lanzhou heavy ion accelerator (HIRFL). The dynamics of the formation of oxide film under the interaction of ion irradiation and LBE will be studied. Meanwhile, the evolution process of the near-surface structure of the material under the interaction and the mechanism of the stability/instability of the oxide film would be revealed. Finally, based on obtained experimental data, comprehensively evaluation and prediction of the corrosion resistance of FeCrAl will be given. It is also able to provide important scientific basis and necessary data support for solving the material problems faced by LFR.