Some aspects of twinning in hcp metals: twin boundary faceting, migration mechanisms, interaction with stacking faults

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• Ritu Verma, CEITEC, Brno University of Technology, Czech Republic
• Thursday 15 June 2023, 15:00-16:00
• Goldsmiths 2 & https://us06web.zoom.us/j/81688365420?pwd=b3RpdHgxNVhWbWQrbXluMUxYNWVtQT09 Meeting ID: 816 8836 5420 Passcode: 047859.

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Twinning plays an important role in materials with low symmetry, e.g. hcp metals (Mg, Ti and their alloys). Migration of twin boundaries are often accompanied by deformation of material (deformation and transformation twins). Classical twin boundaries are considered as flat interfaces lying along a plane, which is invariant to twinning shear. However, in general, twin is a 3-dimensional object, which can be bounded by different types of interfaces. Some of these interfaces are significantly different from symmetrical invariant interfaces. Present work discusses unusual twin interfaces in hcp metals. The examples of such interfaces are less common twins (e.g. (1 1 -2 6) twin) and asymmetrical twin boundaries, which are widely observed during the last years. Connection between twin boundary migration mechanisms and nucleation of asymmetrical facets in twin boundaries is considered.

This talk is part of the Department of Materials Science & Metallurgy Seminar Series series.

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