Abstract
Grain boundary faceting in a well annealed polycrystalline niobium of high purity ( ρ 300 K ρ 4.2 K = 3000 ) has been studied in the paper. A small tendency of the given material to faceting has been revealed (1% faceted boundaries). A steplike structure was observed in high-angle grain boundaries near to coincidence orientations with Σ = 11, 13, 17, 19, 29 and low-angle grain boundaries with an axis 〈110〉 and θ ~ 10°. Analysis of high-angle boundaries faceting has been carried out according to a model of coincidence site lattice (CSL). Two types of facets have been observed-crystallographic facets with orientation corresponding to close-packed planes of CSL and accommodation facets; they were located at the triple grain boundaries joints and at the surface. Orientation of the later is determined by boundary equilibrium conditions at triple joints and on the surface. It has been shown that the faceting of boundaries sensitive to inclination was due to the existence of pinning points giving the boundary orientation.
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