Abstract
In the present work, using high-angle-annular-dark-field scanning-transmission-electron microscopy, the twin boundary of η-MgZn2 precipitates has been investigated in the AA7050 aluminium alloy. The atomic-scale images, taken along [101¯0]η // [110]Al zone axis, indicated the configurations of twin boundaries nearly on the (002¯)Al planes. This twin boundary, composed of well-matched interface and defects, is ascribed to the coalescence of two developed η precipitates grown on the respective (1¯11)Al and (1¯11¯)Al habit planes, and possess a twin relationship with an angle of 109.5ο between the (002¯)Al plane.
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