Abstract
Evolution of structure of Nb subjected to high-pressure torsion (HPT) in liquid nitrogen and further annealing in the temperature range of 100–600°C has been studied by transmission electron microscopy (TEM). HPT at the cryogenic temperature of 80K results in the formation of nanocrystalline structure in Nb, with crystallite sizes of about 75nm and the record-breaking microhardness of 4800MPa. The structure obtained is stable at room temperature but possesses relatively low thermal stability, namely, it undergoes recrystallization at lower temperatures than the structure after the conventional deformation or room-temperature HPT.
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