Formation of < 100 > dislocation loop in bcc-Fe via the ternary loop reaction

XY Wang and N Gao and YN Wang and XY Wu and GG Shu and CL Li and QL Li and B Xu and W Liu, SCRIPTA MATERIALIA, 162, 204-208 (2019).

DOI: 10.1016/j.scriptamat.2018.11.002

In nuclear power plants, body centered cubic (bcc) iron-based alloys are used widely and their mechanical properties are degraded significantly because of irradiation-induced defects. The prevalence of the < 100 > dislocation loops contradicts the rigorous condition for their formation. In this study, we report the process responsible for the formation of the < 100 > dislocation loop, which involves a 1/2 < 111 > loop with a pre-existing sessile complex or simply three differently oriented 1/2 < 111 > dislocation loops. The formation of the < 100 > loop via the tri-loop mechanism has a very low energy barrier and is favored over the formation of the 1/2 < 111 > dislocation loop. (C) 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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