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- Title
Atomic scale analyses of ‐module defects in an NiZr alloy.
- Authors
Sirindil, Abdullah; Kobold, Raphael; Mompiou, Frédéric; Lartigue-Korinek, Sylvie; Perriere, Loic; Patriarche, Gilles; Quiquandon, Marianne; Gratias, Denis
- Abstract
Some specific structures of intermetallic alloys, like approximants of quasicrystals, have their unit cells and most of their atoms located on a periodic fraction of the nodes of a unique ‐module [a set of the irrational projections of the nodes of a (N > 3‐dimensional) lattice]. Those hidden internal symmetries generate possible new kinds of defects like coherent twins, translation defects and so‐called module dislocations that have already been discussed elsewhere [Quiquandon et al. (2016). Acta Cryst. A72, 55–61; Sirindil et al. (2017). Acta Cryst. A73, 427–437]. Presented here are electron microscopy observations of the orthorhombic phase NiZr – and its low‐temperature monoclinic variant – which reveal the existence of such defects based on the underlying ‐module generated by the five vertices of the regular pentagon. New high‐resolution electron microscopy (HREM) and scanning transmission electron microscopy high‐angle annular dark‐field (STEM‐HAADF) observations demonstrate the agreement between the geometrical description of the structure in five dimensions and the experimental observations of fivefold twins and translation defects. This article describes the observation and determination of ‐module defects (twins, translation faults and module dislocations) in NiZr by high‐resolution electron microscopy (HREM), and scanning transmission electron microscopy bright‐field (STEM‐BF) and high‐angle annular dark‐field (STEM‐HAADF).
- Subjects
NICKEL alloys; INTERMETALLIC compounds; QUASICRYSTALS
- Publication
Acta Crystallographica. Section A, Foundations & Advances, 2018, Vol 74, Issue 6, p647
- ISSN
2053-2733
- Publication type
Article
- DOI
10.1107/S2053273318011439