Faceting of Σ3 grain boundaries in Cu: three-dimensional Wulff diagrams

摘要

Diffusional growth of the grain boundaiy (GB) groove permits one to measure the ratio between GB energy σ_(GB) and surface energy σ_(sur). The faceting of twin tilt grain boundaries in Cu has been studied using the GB thermal groove method. No rough facet edges were observed. It means that melting temperature is lower than the roughening temperature for the observed facets in Cu. The influence of orientation and misorientation deviation Δθ = |θ-θ_Σ| from coincidence misorientation θ_Σ has been studied. By increase of Δθ the energy of(100)CSL facet increases. The convenient method for construction 3D three-dimensional Wulff diagrams was found. The 3-dimensional Wulff diagrams were constructed using this method and measured σ_(GB)/σ_(sur) values.