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We compare two quantities to describe a microstructure: the length fraction of 3/9‐grain boundaries and the number fraction of 3‐x‐x/3‐3‐9‐triple junctions using Cu, Ni and four of their alloys in several microstructural states. The fractions of 3‐grain boundaries show similar tendencies as the respective fractions of 3‐x‐x‐triple junctions in relation to the grain size upon deformation and annealing. However, the fraction of 9‐grain boundaries stagnates at certain grain sizes, while there is still a considerable change of 3‐3‐9‐triple junctions during grain growth, meaning that the 3‐3‐9‐triple junction microstructure is still evolving. To analyze the evolution of the triple junction microstructure, a program, such as pythorient, is necessary.
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Emeis et al. (2019) studied this question.
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