Interactions between edge lattice dislocations and Σ11 symmetrical tilt grain boundary: comparisons among several FCC metals and interatomic potentials

Interactions between edge dislocations and a symmetrical tilt grain boundary (GB) in face-centred cubic metals of Ni and Al are studied via a quasicontinuum method (QCM). A variety of embedding atom method potentials are used, and the results are compared to previous studies of Cu [W.S. Yu, Z.Q. Wang, Acta Mater., 60 (2012) 5010]. Different potentials do not significantly affect the edge dislocation–GB interactions in these metals. Edge dislocations can easily transmit across grain boundaries in Ni and Cu, even for a single incoming dislocation. However, slip-transmission in Al occurs only after the GB absorbs many incoming dislocations. Stable nucleation of grain boundary dislocations (GBD) in Cu and Ni plays an important role in the slip-transmissions. The slip transmission in Al is found to be difficult due to the metastable nucleation of GBD. The incoming leading and trailing partials in Al are absorbed together by the GB because of the larger values of (, and are the shear modulus, magnitude of Burge...