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- Title
Formation of < 100 > vacancy dislocation loops from two-dimensional vacancy platelets in body-centered cubic iron.
- Authors
Yang, Yong; Ni, Yong; Liu, Xuepeng; He, Linghui
- Abstract
The < 100 > vacancy dislocation loop is a unique defect of radiation damage in ferritic steels for advanced nuclear systems, but the mechanism responsible for the loop formation remains a puzzle. Here, we report on the formation of < 100 > vacancy dislocation loop in high energy collision cascades overlapping with pre-existing debris using atomistic simulations. Our computations reveal the existence of a novel defect, atomically thick two-dimensional vacancy platelets, in the intermediate stage of the loop formation. The energy analysis and annealing simulations suggests that the < 100 > vacancy loop can be directly produced from the collapse of the nanoscale vacancy platelets on some habit planes. Particularly, the formation of < 100 > vacancy loop depends sensitively on the thickness of the transient vacancy platelets, where a moderate number of two or three atomic layers is critical to form such loop. This is a new formation mechanism for < 100 > vacancy loops, which is different from all previously proposed mechanisms. In addition, the decrease in temperature and Cr concentration are both unfavorable to the collapse of vacancy platelets and thus suppress the < 100 > vacancy loop formation. This finding represents a significant step for understanding the formation of < 100 > vacancy dislocation loops that may provide a basis to enhance the radiation resistance of ferritic materials.
- Subjects
DISLOCATION loops; BODY centered cubic structure; BLOOD platelets; FERRITIC steel; RADIATION damage; DISLOCATIONS in metals; PLATELET-rich plasma
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 15, p6386
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09608-2