Studies on Precise estimation of local mechanical properly change of irradiated fusion materials

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Microhardness of heavy-ion irradiated materials has been carried out by means of microindentation. The analysis code for the estimation of hardness of the thin surface layer using the load-indentation depth curve during loading and unloading was developed and applied to1. Helium co-implanted low antivation ferritic steel irradiated with Ni ions2. Tantalum irradiated with Cu ions and3. Si02 irradiated with He or H ions.The hardness increase of the low activation ferritic steel was found to be proportional to the amount of helium implanted, regardless of the irradiation dose. Microstructure and hardness change were well correlated taking into account the TEM-invisible vacancy defect clustgers, whose concentration was estimated to increase proportional to square root of the fluence. Young' s modulus, as well as hardness, was shown to change by irradiation in SiO2.The present studies have contributed to improving the micro-indentation technique and enhancing understanding of ion irradiation-induced mechanical property change.