Molecular dynamics study of the interactions between the 1/2[111] edge dislocation and the [010] dislocation loop in BCC-Fe

LIN Pandong; NIE Junfeng; LIU Meidan

doi:10.16511/j.cnki.qhdxxb.2022.25.003

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (12) : 2029-2034. DOI: 10.16511/j.cnki.qhdxxb.2022.25.003

MATERIAL SCIENCE

Molecular dynamics study of the interactions between the 1/2[111] edge dislocation and the [010] dislocation loop in BCC-Fe

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Abstract

The mechanical behavior of irradiated RPV steel is important for nuclear reactor safety. The property changes are due to microscale dislocation motion and interactions between dislocations and irradiation defects that need to be further understood. This study used molecular dynamics studies to model the interactions between 1/2[111] edge dislocations and [010] dislocation loops in BCC-Fe. The models show the effects of temperature and dislocation loop radius on the interactions and the critical resolved shearing stress (CRSS). The results indicate that the interactions include the formation of mixed dislocation segments, sweeping of the dislocation segments, formation of screw dipoles and edge dislocations breaking away from the dislocation loop. Higher temperatures promote the absorption of dislocation loops and reduce the CRSS. The length of a [010] dislocation segment swept by a 1/2[111] edge dislocation increases with increasing dislocation loop radius which increases the CRSS.

Key words

dislocation loop / temperature / dislocation loop radius / critical resolved shearing stress (CRSS) / molecular dynamics

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LIN Pandong, NIE Junfeng, LIU Meidan. Molecular dynamics study of the interactions between the 1/2[111] edge dislocation and the [010] dislocation loop in BCC-Fe[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(12): 2029-2034 https://doi.org/10.16511/j.cnki.qhdxxb.2022.25.003

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