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

用微压痕法测定了重离子辐照材料的显微硬度。开发了利用加载-压痕深度曲线估计加载和卸载过程中薄面层硬度的分析程序，并应用于1。Ni离子辐照下氦共注入低钝化铁素体钢。用Cu离子和3辐照钽。用He或H离子辐照的sio2。低活化铁素体钢的硬度增加与氦注入量成正比，与辐照剂量无关。考虑到tem不可见的空位缺陷团簇，显微结构和硬度变化具有良好的相关性，其浓度估计与通量的平方根成正比。在SiO2中辐照后，杨氏模量和硬度发生了变化。本文的研究有助于改进微压痕技术，加深对离子辐照引起的力学性能变化的认识。

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.