On the thermal stability of the cobalt nanostructure formed under severe plastic deformation

The results of the investigations of the temperature dependence of thermal expansion of nanostructured cobalt have been presented. It has been shown that deformation nanostructuring results in the nonlinear behavior of the cobalt thermal expansion curve, and the manifestation of a stepwise sample elongation in the phase transformation temperature range in this curve disappears. It has been found that the sample length at room temperature changes after cycles of heating to various temperatures. Based on the results obtained and X-ray diffraction data, it has been demonstrated that there is a correlation of these changes with recovery and recrystallization processes.