Abstract The aim of the present study is to extend the knowledge about the formation and thermal stability of vacancy-type defects in tungsten under neutron irradiation, thereby mimicking the temperature and neutron flux expected in the ITER divertor. Neutron irradiation of single crystal tungsten, W(100), in the temperature range 600-1200 °C is performed up to 0.12 dpa. Positron annihilation spectroscopy is employed to detect the presence of open volume defects, while hardness tests are applied to relate the irradiation-induced defects with the modification of mechanical properties. Rationalization of the experimental results is enhanced by the application of a kinetic Monte Carlo simulation tool, applied to model the microstructural evolution under the neutron irradiation process. The relation between radiation microstructure and hardness is explained via a dispersed barrier model.

中文翻译：

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高温中子辐照单晶钨的空位分布和硬度变化趋势

摘要 本研究的目的是扩展中子辐照下钨空位型缺陷的形成和热稳定性的知识，从而模拟 ITER 偏滤器中预期的温度和中子通量。在 600-1200 °C 的温度范围内对单晶钨 W(100) 进行中子辐照，最高可达 0.12 dpa。正电子湮没光谱用于检测开放体积缺陷的存在，而硬度测试则用于将辐照引起的缺陷与机械性能的改变联系起来。动力学蒙特卡罗模拟工具的应用增强了实验结果的合理化，该工具应用于模拟中子辐照过程下的微观结构演变。