具有辐照缺陷自修复能力的新型金属材料的制备与机理研究

项目名称： 具有辐照缺陷自修复能力的新型金属材料的制备与机理研究

项目编号： No.U1260102

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 肖湘衡

作者单位： 武汉大学

项目金额： 60万元

中文摘要： 在核反应堆的中子辐照、高温和应力存在的环境中，需要具有足够耐高温、耐腐蚀、抗辐照、长寿命的新材料。面对第四代核能系统和聚变堆提出的新要求，许多现在已在使用的不锈钢、锆合金、镁合金、铝合金等材料将不再符合要求，必须要有创新的思想，使其具有强抗辐照和自修复性能。本项目基于微纳结构缺陷自我修复的概念，研究探索具有抗辐照自愈能力的金属多层膜材料。对研制的金属多层膜材料进行氢、氦和重离子辐照，通过本单位独特的透射电镜离线与原位观察，结合正电子湮没谱学，深入了解缺陷与纳米晶界的相互作用，从原子尺度上揭示金属多层膜抗辐照自愈能力的机理，研究其在极端条件下的力学性能的演变过程及规律。为核反应堆内结构材料的选取、改良和升级提供理论指导和基础数据，设计开发出具有自主知识产权的先进的抗辐照实用型材料。

中文关键词： 金属多层膜；抗辐照；；；

英文摘要： The performance of structural materials in extreme environments of irradiation and temperature must be significantly improved to extend the reliability, lifetime, and efficiency of future nuclear reactors. In reactor environments, damage introduced in the form of radiationinduced defects and helium results in embrittlement and dimensional instability. Therefore, the ability to control radiation-induced point defects and helium bubble nucleation and growth is a crucial first step to improving the mechanical properties of irradiated metals. This calls for novel approaches in designing structural materials that resist radiation damage while maintaining high strength and toughness. Recently, nanolayered metallic composites have been shown to have improved radiation resistance compared with their polycrystalline counterparts. It has been speculated that interfaces may serve as effective sinks for defects. Using nanolayered metallic composites as model systems, we highlight how tailoring the length scales (layer thickness) and interface properties can provide insight into ways of designing radiation damage tolerant structural materials. But how defects interact with interfaces at the atomic scale is far from understood, we perform in situ investigations on the evolution of microstructures during ion irradiation by a t

英文关键词： nanolayered metallic composite；resist radiation damage；；；