辐照作用下铍在动态EDM-1流体中的冲刷腐蚀性能及机械性能研究

铍是粒子物理和核物理实验中的重要材料，我国现运行北京正负电子对撞机（BEPCⅡ）/北京谱仪（BESⅢ）和正谋划建设的环形正负电子对撞机（CEPC）都将铍作为粒子对撞管——束流管的制作材料。高速运行粒子对束流管产生大量γ和中子辐照及热负荷，须有流体介质对其冲刷冷却，目前辐照作用下铍在动态流体中的冲刷腐蚀性能及机械性能国内外鲜有研究，还不得而知。本项目拟在γ和中子辐照作用下对铍在动态一号电火花加工油（EDM-1）中的冲刷腐蚀性能及机械性能进行研究，给出辐照作用下铍在动态EDM-1中的冲刷腐蚀性能及机械性能变化规律，建立辐照作用下铍在EDM-1中的冲刷腐蚀理论和机械强度理论模型；揭示引起铍性能变迁的微观机理，构建辐照作用下铍内部结构反应机理理论构架。本项目为BESⅢ粒子探测、CEPC建设以及铍构件在核物理实验中的应用提供安全支撑，为适用于辐照环境的抗腐蚀和高强度铍的设计和制备奠定理论和技术基础。

Beryllium is one of the most important material in particle physics and nuclear physics experiments, which is used as the material of particle collision tube—beam pipe in the operational Beijing Electron and Positron Collider (BEPC Ⅱ)/ Beijing Spectrometer Ⅲ (BES Ⅲ) and Circular Electron Positron Collider (CEPC) being planned to build up. High-speed particles produce large amounts of γ and neutron irradiation and heat load on the beam pipe. The beam pipe must be cooled by the scouring fluid to keep the temperature stable for BES Ⅲ detecting particles, which will induce fluid erosion on the beam pipe. The erosion-corrosion properties and mechanical properties of beryllium in scouring fluid under the effect of irradiation are not known yet. The project aims to study the change of erosion-corrosion properties and mechanical strength and the microcosmic mechanism of beryllium in No.1 electrical discharge machining oil (EDM-1) under the effect of γ and neutron irradiation. The change rules of erosion-corrosion properties and mechanical strength of beryllium in EDM-1 under irradiation will be presented, and a theoretical system for erosion-corrosion and a theoretical model of mechanical strength for beryllium in EDM-1 under irradiation will be established. The microcosmic mechanism causing erosion-corrosion properties and mechanical strength of beryllium will be revealed, and the reaction mechanism theory of internal structure of beryllium under irradiation will be built. The research results of the project will provide an important security for the normal particle detection of BES Ⅲ, construction of CEPC and operation of beryllium component in particle physics and nuclear physics experiments, and offer a theoretical and technological support for developing and manufacturing beryllium with corrosion protection and high mechanical strength in radiation environment.