Abstract
An investigation has been carried out to measure and categorize the grain-boundary plane indices of boundaries in pure nickel. Coincidence site lattices (excluding Σ = 3s) were found to be either asymmetrical tilt boundaries with high indices, or have irrational boundary planes. For the Σ=3s, almost half were asymmetrical tilt boundaries displaced from the 111/111 symmetrical tilt boundary on the 110 zone. Such boundaries have low energies compared to other Σ=3s. The 211/211 incoherent twin was not observed, which was explained on the basis of its higher energy compared to other boundaries on the 110 zone. The results are compared and contrasted with previous data, where boundaries abutted the specimen surface during annealing, which is not the case for the present data. Comments are made with respect to the relationship between macroscopic and atomic-level boundary geometry and implications of the results for grain-boundary properties.
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