ABSTRACT
This chapter summarizes the investigations of grain boundary (GB) geometry. It includes the technique used to make the measurements, the materials studied, the topic of investigation, how the data are represented and displayed, the sample population size and, where applicable, the maximum S-value for coincidence site lattice classification. The chapter reviews how GB geometry has been measured and analysed, and how the measurements are evolving with time. The survey of GB geometrical investigations is divided into four parts, according to which experimental technique has been used to make the measurements—X-ray techniques (principally Laue diffraction), transmission electron microscope (including HVEM), selected area channelling or electron back-scatter diffraction. The GB plane normals can be measured in both the TEM and SEM and, with increased understanding of the role of this parameter in linking GB geometry to properties, it is likely that their measurement will begin to feature more commonly in GB geometry studies.
