Morphological Evolution of a Fully Faceted Grain Boundary


We examine the morphological evolution of faceted grain boundaries in gold during annealing. Experiments were performed on <111> oriented gold films composed of two Σ=3 related orientation variants. The boundaries between these variants initially possess a high density of finely spaced (<25 nm) facets on {112¯} type planes. During annealing a large proportion of these fine-scale corrugations are annihilated, and the facet distribution coarsens significantly. Through in situ transmission electron microscopy (TEM), we directly observe this coarsening process. These results show a more complex behavior than geometric models for facet evolution would suggest and point to the need for an improved understanding of facet-junction properties and the interactions between grain boundary facets and dislocations.

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Correspondence to D. L. Medlin.

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Medlin, D.L., Lucadamo, G. Morphological Evolution of a Fully Faceted Grain Boundary. MRS Online Proceedings Library 652, 34 (2000).

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