Faceting of 11(2)over-bar6 twin interfaces in rolled pure magnesium

R Verma and L Kral and A Ostapovets, PHILOSOPHICAL MAGAZINE, 102, 861-874 (2022).

DOI: 10.1080/14786435.2021.2022232

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 = 0.03011 (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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