熔盐堆环境下结构材料辐照损伤机制及其高温熔盐腐蚀特性研究

项目名称： 熔盐堆环境下结构材料辐照损伤机制及其高温熔盐腐蚀特性研究

项目编号： No.91226202

项目类型： 重大研究计划

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 薛建明

作者单位： 北京大学

项目金额： 490万元

中文摘要： 在熔盐堆（MSR: molten-salt-reactor）中高温、强辐射和熔盐腐蚀等极端环境中，材料的结构和性能会发生变化，从而影响到MSR装置的安全与使用寿命。本项目研究MSR中结构材料在高温辐照条件下辐射损伤的规律和机制，以及辐射损伤对材料力学性能和抗高温熔盐腐蚀性能的影响。研究材料主要包括镍基合金（Hasteolly系列）和具有层状纳米结构的新型抗辐照材料（MAX相：Ti3SiC2和Ti2AlC）。在不同温度下，利用多种手段（单、双束离子和中子）辐照样品，分析测量材料中辐照损伤缺陷的种类、结构和性质，以及辐照前后材料力学和抗高温熔盐腐蚀能力的变化。特别关注辐照温度、合金中的微量元素以及晶界等对镍基合金抗辐照和抗熔盐腐蚀性能的影响。建立针对上述材料的多尺度计算机模拟平台，研究上述材料中辐照损伤缺陷的产生、复合、迁移、聚集规律以及氦泡的形成和长大机制，建立辐照损伤对材料力学和抗腐蚀能力

中文关键词： MAX相；镍合金；辐照损伤；熔盐腐蚀；多尺度模拟

英文摘要： Material’s micro-structure and performance can be changed when they are exposed to the extremely hard environment (high temperature, high fluence neutron and salt corrosion ) in molten-salt-reactor system (MSR), resulting in affecting the safty and service lifetime of MSR system. Our research will investigate the irradiation effects by neutron and energetic ions in Hasteolly alloys and MAX phase materials(Ti3SiC2和Ti2AlC),which are potential candidates of MSR structural material. The influence of irradiation on materials’ mechanical property and corrosion resistance will also be measured. We will use both neutron and energetic ions to irradiate these materials, and analyze the properties of irradiation defects and measure their mechanical and corrosion resistance before and after irradiation. It is important to reveal the influence of irradiation temperature, doping element concentration and grain boundary on material’s performance in MSR environment. By using computer simulation techniques, we investigate the mechanism for defect production, transportation and segregation, also the formation process of He bubble. A model will be set up to estimate the performance degradation of materials used in MSR. Based on the experimental and theoretical results, methods to improve materials performance in MSR environment wi

英文关键词： MAX phase；nickel alloy；irrdiation damage；molten salt corrosion；multi-scale simulaiton