In-situ TEM observation and MD simulation of the reaction and transformation of < 100 > loops in tungsten during H (+)(2) & He+ dual- beam irradiation

YF Ding and L Guo and YP Li and XY Liu and G Ran and L Wu and X Qiu and HQ Deng and XY Wu and YM Li and XY Huang, SCRIPTA MATERIALIA, 204, 114154 (2021).

DOI: 10.1016/j.scriptamat.2021.114154

Low mobility < 100 > loops significantly affect the mechanical properties of body-centered cubic materials and their generation and evolution have been a hot research topic recently. However, there is still a lack of direct observation on the reaction of the formed < 100 > loops during subsequent irradiation, which hinders a better understanding of the degradation of mechanical properties induced by irradiation. Here, we reported for the first time that the reaction between < 100 > loops produced 1/2 < 111 > loop through in-situ TEM observation during 30 keV H 2 + & He + dual-beam irradiation in tungsten. Molecular dynamics simulation showed that this reaction required appropriate relative position of the initial < 100 > loops and high temperature that could induce < 100 > loop split into 1/2 < 111 > segments and then transformed into 1/2 < 111 > loop. Meanwhile, the evolution of < 100 > loops was in-situ observed. The average size and areal number density of < 100 > loops were quantified as a function of irradiation fluence. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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