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https://doi.org/10.1038/s41467-018-03250-8
Title: | Precipitation of binary quasicrystals along dislocations | Authors: | Yang, Z Zhang, L Chisholm, M.F Zhou, X Ye, H Pennycook, S.J |
Keywords: | alloy magnesium zinc alloy crystal structure crystallinity dislocation precipitation (chemistry) Article atom compression crystallization energy dispersive X ray spectroscopy entropy hardness molecular dynamics precipitation scanning transmission electron microscopy strength |
Issue Date: | 2018 | Publisher: | Nature Publishing Group | Citation: | Yang, Z, Zhang, L, Chisholm, M.F, Zhou, X, Ye, H, Pennycook, S.J (2018). Precipitation of binary quasicrystals along dislocations. Nature Communications 9 (1) : 809. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-018-03250-8 | Rights: | Attribution 4.0 International | Abstract: | Dislocations in crystals naturally break the symmetry of the bulk, introducing local atomic configurations with symmetries such as fivefold rings. But dislocations do not usually nucleate aperiodic structure along their length. Here we demonstrate the formation of extended binary quasicrystalline precipitates with Penrose-like random-tiling structures, beginning with chemical ordering within the pentagonal structure at cores of prismatic dislocations in Mg-Zn alloys. Atomic resolution observations indicate that icosahedral chains centered along [0001] pillars of Zn interstitial atoms are formed templated by the fivefold rings at dislocation cores. They subsequently form columns of rhombic and elongated hexagonal tiles parallel to the dislocation lines. Quasicrystalline precipitates are formed by random tiling of these rhombic and hexagonal tiles. Such precipitation may impact dislocation glide and alloy strength. © 2018 The Author(s). | Source Title: | Nature Communications | URI: | https://scholarbank.nus.edu.sg/handle/10635/178427 | ISSN: | 2041-1723 | DOI: | 10.1038/s41467-018-03250-8 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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