2015/03/25 by Jiawei Wang, Z. G. Wang, Wang, J. +25
Engineering · Materials Science · #FOS: Physical sciences #Fusion materials and technologies #Ion-surface interactions and analysis #Materials Science (cond-mat.mtrl-sci) #Nuclear Materials and Properties
paper · pdf · doi:10.48550/arxiv.1503.08088
openalex publication_date 2015/03/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A recently developed reduced activation ferritic/martensitic steel MNHS was irradiated with 200keV He ions to a fluence of 1E21ions/m2 at 450 celsius degree and 1E20ions/m2 at 300 celsius degree and 450 celsius degree, respectively. The irradiation hardening of the steel was investigated by nanoindentation measurements combined with transmission electron microscopy (TEM) analysis. Dispersed barrier-hardening (DBH) model was applied to predict the hardness increments based on TEM analysis. The predicted hardness increments are consistent with the values obtained by nanoindentation tests. It is found that dislocation loops and He bubbles are hard barriers against dislocation motion and they are the main contributions to He irradiation-induced hardening of MNHS steel. The obstacle strength of He bubbles is stronger than the obstacle strength of dislocation loops.