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We analyze the dislocation content of grain boundary (GB) phase junctions,i.e., line defects separating two different GB phases coexisting on the same GBplane. While regular GB disconnections have been characterized for a variety ofinterfaces, GB phase junctions formed by GBs with different structures anddifferent numbers of excess atoms have not been previously studied. We apply ageneral Burgers circuit analysis to calculate the Burgers vectors b ofjunctions in two {\Sigma}5 Cu boundaries previously simulated with moleculardynamics. The Burgers vectors of these junctions cannot be described by thedisplacement shift complete (DSC) lattice alone. We show that, in general, thenormal component of b is not equal to the difference in the GB excess volumes,but contains another contribution from the numbers of GB atoms per unit area{\Delta}N required to transform one GB phase into another. In the boundariesstudied, the latter component dominates and even changes the sign of b. Wederive expressions for the normal and tangential components of b in terms ofthe DSC lattice vectors and the non-DSC part due to {\Delta}N and additional GBexcess properties, including excess volume and shears. These expressionsprovide a connection between GB phase transformations driven by the GB freeenergy difference and the motion of GB junctions under applied normal and shearstresses. The proposed analysis quantifies b and therefore makes it possible tocalculate the elastic part of the energy of these defects, evaluate theircontribution to the nucleation barrier during GB phase transformations, andtreat elastic interactions with other defects.

Dislocation content of grain boundary phase junctions and its relation to grain boundary excess properties