Peculiarities of structure and mechanical properties of vanadium after heavy low-temperature drawing deformation

The changes in the structure and mechanical properties of polycrystalline vanadium after drawing deformation (including the application of ultrasound) up to 98% at 77 and 300 K are studied and analyzed. It is found that a decrease in the deformation temperature leads to retardation of mass fragmentation of the material along with a considerable increase in the degree of structure imperfection. As a result, the regions of uniform distribution of dislocations are observed up to 90% compression. Possible evolution of this type of structure is considered. It is assumed that the highest dislocation density attainable in the process of deformation is two orders of magnitude lower than the theoretical estimate even under the most favorable conditions for preserving this structure. Continuous disorientations induced in the structure by smeared dislocation piles of the same sign do not exceed 5°. The correlation between structure parameters and observed peculiarities in mechanical properties is analyzed.

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