Abstract
In deformation twinning, the twinning boundary (TB) contour usually looks elliptical. Here, the 101¯2 TB contours are investigated in AZ31, Ti and Co by using transmission electron microscopy (TEM) and high-resolution TEM, suggesting a very irregular shape. The formation of a 101¯2 irregular-shaped TB is closely related to the interface defects and basal–prismatic interfaces, which place basal and prismatic planes face to face.
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