Radiation effects on impurity-diffusion in Fe towards an Improvement of prediction of RPV embrittlement

2016 Fiscal Year Final Research Report

• Project/Area Number: 26709073
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Nuclear engineering
• Research Institution: Tohoku University
• Principal Investigator: Toyama Takeshi 東北大学, 金属材料研究所, 准教授 (50510129)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 拡散 / 電子線照射 / 原子炉圧力容器鋼 / ３次元アトムプローブ

Outline of Final Research Achievements

The diffusion coefficient of copper in iron is an important basic parameter for irradiation embrittlement study of reactor pressure vessels. It should be noted that diffusivity may be greatly promoted under irradiation due to the large amount of vacancies and interstitial atoms induced by irradiation, which is greatly higher than those in thermal equilibrium. In this study, the copper concentration profiles in copper-iron diffusion pair irradiated with electron were obtained by 3D-AP. It is found that radiation-enhanced diffusion occurs at low temperature. Furthermore, it was also found that there was almost no irradiation effect on the solid solubility limit concentration of copper.

Free Research Field

原子力材料