Grain boundary engineering aims at optimizing the properties of face centred cubic materials with low stacking fault energy by creating a high content of special twin boundaries. Quantifying twinning and its parameters, such as twin related domains and the related ∑3n special grain boundaries, was thus of prime importance for grain boundary engineering. A method was presented in detail to treat the electron back-scatter diffraction maps. The twin related domains were automatically

reconstructed, the twinning chain trees of the twin related domains were determined and represented with fractal graphs, and the ∑3n grain boundaries were identified up to order n = 12. New parameters, such as the numbers of grains (Ng), the lengths of the longest chain, the twinning polysynthesism (p) and twinning anisotropy (a) factors, were also calculated. Examples were given for two nickel superalloys, a silicon ingot, a cadmium telluride film, and a copper thin film.

Quantification of Multiple Twinning in Face Centred Cubic Materials. C.Cayron: Acta Materialia, 2011, 59[1], 252-62