The generalized coincidence site network model was applied to the study of face-centered cubic twist [100] grain boundaries. The result was a detailed atomistic description of general (100) twist grain boundaries; supported by a set of quantitative expressions which were obtained directly from hypotheses concerning the primary and secondary dislocation spacings and Burgers vectors. These were in complete agreement with accepted theory and experimental observations. According to the model, singular boundaries (defined as being those boundaries which contained only one primary dislocation per coincidence site lattice unit cell) were suggested to be composed of atomic domains having the structure of Σ1; separated by an array of perfect primary dislocations. Each random boundary had an associated singular boundary, and its structure consisted of a mixture of domains, found in the associated boundary, in various translational states. These domains were themselves separated by an array of partial secondary dislocations. A non-singular boundary therefore contained arrays of both primary and secondary dislocations.

Detailed Atomic Structure of Arbitrary FCC [100] Twist Grain Boundaries. D.Romeu, L.Beltrán-del-Rio, J.L.Aragón, A.Gómez: Physical Review B, 1999, 59[7], 5134-41