A mechanism for basal vacancy loop formation in zirconium
C Dai and P Saidi and M Topping and LK Beland and Z Yao and MR Daymond, SCRIPTA MATERIALIA, 172, 72-76 (2019).
Experiments and molecular dynamics were combined to determine a formation mechanism for basal vacancy loops in zirconium. In scanning/transmission electron microscopy images with different tilting angles, the majority of prismatic loops lying on a given basal plane do not align on a trace, but are seemingly randomly distributed in the plane. Similar arrangements are observed in molecular dynamics simulations. Over 200 collision cascade simulations were performed. Basal cascade-induced dislocation segments are observed in arrangements with a high density of prismatic vacancy loops, consistent with earlier experimental observations. This mechanism of basal c-loop formation may explain the experimentally observed incubation period. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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