Influence of Annealing Temperature on Microstructure Parameters and Microhardness of Tantalum After Deformation by Rolling

The characteristics of the relaxation and recrystallization processes in pure tantalum deformed by rolling at room temperature are studied. It is established that at 800°C the recovery processes are activated and nuclei of recrystallization grains appear. After 1000°C, an activation of primary recrystallization is observed, which, after annealing at 1200°C, involves the entire material volume. It is shown that the processes of structural relaxation beginning at 800°C are accompanied by a dramatic decrease in microhardness.