It was shown that partial grain boundary dislocations formed two of the three independent arrays of secondary grain boundary dislocations in incoherent Σ3 boundary facets on {421}/{1085} planes in a face-centered cubic Cu-6at%Si alloy. Two states of rigid-body displacement between the grains existed at these interfaces and these rigid-body displacements, together with the Burgers vectors of the partial grain boundary dislocations, were determined. The difference in grain boundary energy between the two states of rigid-body displacement was estimated to be 2.5mJ/m2 as determined from the Burgers vectors and the measured separations of the partial grain boundary dislocations.

Dissociated Grain Boundary Dislocations in Some Incoherent Twin Boundaries. C.T.Forwood, L.M.Clarebrough: Philosophical Magazine A, 1986, 53[6], 863-86