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Medientyp:
E-Artikel
Titel:
Low-energy, Mobile Grain Boundaries in Magnesium
Beteiligte:
Liu, Xiangli;
Wang, Jian
Erschienen:
Springer Science and Business Media LLC, 2016
Erschienen in:
Scientific Reports, 6 (2016) 1
Sprache:
Englisch
DOI:
10.1038/srep21393
ISSN:
2045-2322
Entstehung:
Anmerkungen:
Beschreibung:
AbstractThe strong basal texture that is commonly developed during the rolling of magnesium alloy and can even increase during annealing motivates atomic-level study of dislocation structures of both <0001> tilt and twist grain boundaries (GBs) in Magnesium. Both symmetrical tilt and twist GBs over the entire range of rotation angles θ between 0° and 60° are found to have an ordered atomic structure and can be described with grain boundary dislocation models. In particular, 30° tilt and twist GBs are corresponding to energy minima. The 30° tilt GB is characterized with an array of Shockley partial dislocations bp:- bp on every basal plane and the 30° twist GB is characterized with a stacking faulted structure. More interesting, molecular dynamics simulations explored that both 30° tilt and twist GBs are highly mobile associated with collective glide of Shockley partial dislocations. This could be responsible for the formation of the strong basal texture and a significant number of 30° misorientation GBs in Mg alloy during grain growth.