Abstract
In this review, present experimental knowledge on solute segregation at individual, crystallographically specified grain boundaries is summarized. First part of the paper is devoted to geometric description of grain boundaries, geometric criteria for their characterization are mentioned and Paidar's geometric classification of symmetrical tilt grain boundaries is introduced. In the second part, the generally used thermodynamic description of solute segregation at grain boundaries is briefly suggested. The main goal of this review consists in discussion on the results of experimental study of anisotropy of grain boundary segregation and on the structure/property relationship for interfaces. It is shown that it is often ambiguous to represent such structure/property relationship by simple chemical composition of interfaces. Thermodynamic parameters of grain boundary segregation such as enthalpy, can serve as a more general characteristics. Correlation of the data on solute segregation at individual interfaces to simple geometric criteria related to the grain boundary structure as well as to grain boundary plane classification results in characterization of all [100] singular tilt grain boundaries in α-iron.

Key words
solute segregation, Paidar's geometric classification, geometric description of grain boundaries, thermodynamic parameters

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