A molecular statics study has been performed on <112> symmetrical tilt boundaries in fcc metals using pair potentials fitted to Cu and Ni. Boundaries are found to consist of a pair of walls of Shockley partials in both metals; distance between walls is much smaller than that between partials of an isolated extended dislocation. The separation between partial dislocation walls decreases with the increasing tilt angle and boundaries eventually come to have different structures from those observed

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... in lower angle boundaries when the tilt angle exceeds a critical value depending on the potentials used. The critical shear strain for motion of the boundaries increases with the increasing tilt angle which is in good qualitative agreement with experimental observations so far reported.