The research of interaction between irradiation defects and dislocation for evaluating mechanical degradation of nuclear structural materials

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420865
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: University of Fukui
• Principal Investigator: Fukumoto Kenichi 福井大学, 附属国際原子力工学研究所, 教授 (30261506)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ボイド-転位相互作用 / 照射硬化 / 転位チャンネル / 障害強度因子 / 照射欠陥集合体 / TEM内引張 / 分子動力学計算

Outline of Final Research Achievements

A method of in-situ measurement of dislocation behavior during tensile test in TEM column was adopted for obtaining values of the obstacle strength parameter for defect clusters in order to evaluate lifetime of nuclear materials. It provides the accurate analysis for evaluating irradiation hardening quantitatively.The cavity size dependence of obstacle barrier factor sis not change so much for the type of bcc metals.
The dislocation motion to create a dislocation channel in ion-irradiated SUS304 steel was directly observed during tensile deformation test. Two types of dislocation behavior were observed on the formation of dislocation channel; (1) A zig-zag motion of extended dislocation with expansion and shrink repeatedly during dislocation propagation through irradiated area and (2) A rapid expansion of stacking fault with wide width after the high stress was applied in the irradiated area.

Free Research Field

原子力材料学