Structural Evolution of Niobium Single Crystal Under Different Orientations and Deformation Temperatures
Gapontseva, T. M., et al. The Physics of Metals and Metallography, 2016, 117, 336-347.
Severe plastic deformation produced by high-pressure torsion (HPT) in a Bridgman anvil is used to refine the metal structure. The effect of the initial {001} and {110} orientations of single crystal niobium and HPT temperature on the structural evolution during deformation of the Bridgman anvil was studied. · HPT deformation of niobium results in a continuous change of structural state stages: cellu lar, mixed, and submicrocrystalline structure stages. · The single crystal with the hard {001} orientation at the stage of the cellular structure undergoes fragmentation, which causes the discrete misorientation of the part of lowangle boundaries. · With further deformation at room tempera ture, the structure is refined more slowly in single crys tals with a hard {001} orientation than in single crystals with a soft {110} orientation. · Decreasing the temperature of HPT deformation to 80 K increases the refinement rate at the second and third stages and results in the formation of a structure with an average microcrystallite size of 50-40 nm.
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