(0090)Evaluation of depth profile of hardness in ion-irradiated tungsten (W) single crystal

摘要

Structural components of fusion energy systems are expected to suffer from radiation embrittlement due to high energy neutron irradiation and the generation of transmutation helium (He) during operation. To simulate such fusion condition, ion irradiation facility using two MeV class accelerators is adequate by serving simultaneous irradiations of heavy ions for producing heavy displacement damages and helium ions. Since these synergistic effects are often limited at the near surface area within the range of a few micrometers and the resulting depth profiles of damage and helium are inhomogeneous, nanoindentation hardness measurement is essential to investigate the effects on mechanical properties of ion-irradiated materials.