The interaction between small vacancy clusters and twin boundaries was studied by using Ackland et alia’s many-body potential for face-centred cubic metals. The interaction energies, of single-, di- and tri-vacancy clusters with (111) and (112) twin boundaries, were computed by using well-established simulation techniques. For (111) twins, the vacancy clusters were highly repelled when they were on adjacent planes, and were attracted when they were away from the boundary. In the case of (112) twins, vacancy clusters were more attracted to the boundary when they were near to the boundary rather than far away from it. Vacancy clusters on both sides of the boundary were also investigated, and it was observed that the clusters preferred, energetically, to lie on the off-mirror sites as compared with the mirror position across the twin.

Interaction of Point Defects with Twin Boundaries in Copper. S.A.Ahmad, R.Ramzan: Chinese Physics Letters, 2007, 24[9], 2631-4