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(a) HRTEM image of intersecting twins ( and , marked with white lines) observed in cold-rolled nc Ni. A Burgers circuit starting at and ending at shows that contains an edge Shockley partial dislocation. This enlarged view is for the white-boxed area in (b). The overview of this area inside the grain is shown in (c).
(a) HRTEM micrograph showing growing twins in nc-Ni, in grain and in grain , that lengthen and broaden and eventually meet to form a curved TB, . A cluster of stacking faults is also observed nearby. The twin relationship between grains and , and that between , , and , are confirmed in the fast Fourier transformation of the respective regions in (b). (c) HRTEM image showing the growth of by dynamic overlapping of extended partial dislocations, i.e., absorbing stacking faults on adjacent slip planes. (d) The TB is wavy as it is decorated by dislocations. Inset is the low magnification of grains and .
HRTEM image of a group of grains in nc-Ni after surface milling treatment. The formation of twin lamella and its boundaries can be explained based on the grain boundary splitting and migration mechanism.
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