A mechanism for basal vacancy loop formation in zirconium

Publication date: November 2019Source: Scripta Materialia, Volume 172Author(s): C. Dai, P. Saidi, M. Topping, L.K. Béland, Z. Yao, M.R. DaymondAbstractExperiments 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.Graphical abstract
Source: Scripta Materialia - Category: Materials Science Source Type: research