Abstract
The crystallographic parameters and faceting during annealing of Σ = 9; 27; 81; 243 special grain boundaries in stainless steel and copper are investigated by TEM technique. The preferential facet orientation parallel to closely packed {Okl} planes of CSL is supposed to be due to a special feature of the Σ = 3n boundary formation, that is realized by multiple interaction of Σ = 3 twin boundaries. A strong agreement is observed between the experimental rotation angles and theoretical ones. It is concluded that Σ = 3n boundaries may serve as standards for further investigations of grain boundaries in polycrystalline materials. [Russian Text Ignored].
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