Journal
PHILOSOPHICAL MAGAZINE
Volume 102, Issue 10, Pages 861-874Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2021.2022232
Keywords
Magnesium; twin boundary; interfaces; atomistic simulations; SEM; TEM
Categories
Funding
- Czech Science Foundation [18-07140S]
- specific research project Central European Institute of Technology [CEITEC-J-21-7507]
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Recent studies have shown that the faceting of twin boundaries is common in hcp materials. Asymmetrical facets in twin interfaces are a result of the twin boundary migration mechanism. This mechanism is also applicable to less common {11 (2) over bar6} twins, with migration mediated by disconnections and nucleation of asymmetrical facets demonstrated through atomistic simulations and TEM images.
Recent studies proved that the faceting of twin boundaries is a common feature in hcp materials. It was demonstrated that the asymmetrical facets in the most frequent {10 (1) over bar2} and {10 (1) over bar1} twin interfaces are the consequence of the twin boundary migration mechanism. We demonstrate that a similar mechanism is also applicable to less common {11 (2) over bar6} twins, observed in pure magnesium rolled at room temperature. The migration of {11 (2) over bar6} twin boundary is mediated by disconnections, which have Burgers vector b = 0.030[11 (2) over bar(1) over bar] and step height equal to four {11 (2) over bar6} interplanar distances. The mechanism of asymmetrical facets nucleation is also demonstrated by using atomistic simulations. The simulations are supported by transmission electron microscopy (TEM) of asymmetrical basal-pyramidal interfaces of {11 (2) over bar6} twins.
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