Combined Effects of Light Gas and Damage Accumulation in Beryllium

铍在各种环境中有应用，这些环境将（或已经）将其暴露于辐射，这将导致氦气的积累，并导致原子从其晶格位置的位移。铍将是目前正在法国建造的热核实验堆磁约束核聚变反应堆中面向等离子体的材料，而铍化钛则正在开发中，用于热核实验堆之后的示范发电厂的氚增殖层的“卵石床”设计概念。在高能加速器研究中，铍正被考虑作为质子驱动粒子源的组件，在质子驱动粒子源中，铍将经历比核聚变环境中更高的氦积累率。本项目将利用透射电子显微镜和红外光谱技术，探索铍和钛铍化物中气体积累和位移损伤的影响。原位离子辐照以在用离子束轰击的同时观察微结构。通过改变温度、气体注入与原子位移速率的比率以及辐照剂量，该项目将建立一个实验数据的三维矩阵。材料微观结构的变化决定了组件在上述极端环境下的性能变化。因此，这些结果将使在这些条件下的微观结构演变的方式得到更好的理解，从而支持这些重要技术的发展。

Beryllium has applications in various environments which will (or already do) expose it to radiation which will result in the accumulation of helium gas and cause the displacement of atoms from their crystal lattice sites. Beryllium will be the material facing the plasma in the ITER magnetic-confinement nuclear fusion reactor currently under construction in France and titanium beryllide is being developed for use in the "pebble bed" design concept for the tritium-breeding blanket of the DEMO power plant which will follow ITER. In high-energy accelerator research, beryllium is being considered for components in proton-driven particle sources where it will experience even higher rates of helium accumulation than in nuclear fusion environments.This project will explore the effects of gas accumulation and displacement damage in beryllium and titanium beryllide using transmission electron microscopy with in-situ ion irradiation to simultaneously observe the microstructure whilst bombarding with an ion beam. By varying the temperature, ratio of gas implantation to atomic displacement rates and the irradiation dose, this project will build up a three-dimensional matrix of experimental data.Changes in the microstructure of a material determine how the performance of components change under the extreme environments described above. Therefore, these results will allow the ways in which the microstructure evolves under these conditions to be better understood and thus support the development of these important technologies.