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Dislocation Interactions
Two dislocations of the same sign moving on the same slip plane exert a repulsive force on each other, which causes them to repel each other.
Two dislocations of opposite sign moving on the same slip plane exert an attractive force on each other, which causes them to attract each other and annihilate.
Two dislocations of the same sign moving on different slip planes exert an attractive force on each other. They form an energetically favourable array which minimises the energy of the system.
Two dislocations of opposite sign moving on different slip planes exert a repulsive force on each other, which causes them to repel each other.