A systematic study of solute segregation in numerous Fe-3.5at%Si bicrystals revealed all of the special [100] tilt grain boundaries. Plots of segregation enthalpy versus grain boundary orientation were compared with the grain boundary plane classification. From this correlation, it was concluded that the {012}, {013} and {015} symmetrical, and (001)/(013) and all (011)/(0kl) asymmetrical grain boundaries were special. All of the other (001)/(0kl) asymmetrical boundaries exhibited a low tendency to solute segregation, and could be considered to be vicinal interfaces. All of the other boundaries, except low-angle grain boundaries, were general.

Special [100] Tilt Grain Boundaries in Iron: a Segregation Study. P.Lejcek, V.Paidar, S.Hofmann: Materials Science Forum, 1999, 294-296, 103-6