The stress field, strain energy and interaction force were calculated for an isolated pair of straight parallel screw dislocations, one or both of which was associated with micro-pipes. The effect of the attraction of 2 dislocated micro-pipes (or a dislocated micro-pipe and a full-core screw dislocation) with Burgers vectors of the same sign was examined in detail. An analytical expression for the critical distance below which a dislocated micro-pipe attracted a full-core screw dislocation was found. It was shown that 2 parallel dislocated micro-pipes with same-sign Burgers vectors could attract each other if the distance between the micro-pipes was small enough and the ratios of the micro-pipe radii and the Burgers-vector magnitudes were sufficiently different. The stress field and strain energy of a dislocated micro-pipe near to a planar free surface, and the force of the interaction between the micro-pipe and the free surface were also found.

Elastic Interaction of Micropipes in Crystals. M.Y.Gutkin, A.G.Sheinerman: Physica Status Solidi B, 2002, 231[2], 356-72