A mechanism for basal vacancy loop formation in zirconium. (November 2019)

• Record Type: Journal Article
• Authors: Dai, C.; Saidi, P.; Topping, M.; Béland, L.K.; Yao, Z.; Daymond, M.R.
• Is Part Of: Scripta materialia. Number 172(2019)
• Page Start: 72
• Page End: 76
• Publication Date: 2019-11
• Subjects: Lattice defects -- Radiation damage -- Scanning/transmission electron microscopy (STEM) -- Molecular dynamics (MD); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.07.006
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image