Effect of High-Pressure Torsion on Recrystallization Behavior of Pure Tungsten

The high-pressure torsion (HPT) deformation of sintered pure tungsten was carried out under low temperature condition. Recrystallization microstructures and behavior of pure W during the subsequent heating was analyzed under different torsion turns using a variety of detection and calculation methods such as EBSD, XRD and DSC. The results show that the deformation storage energy of pure W increases and the activation energy decreases after HPT deformation, but the recrystallization temperature is still high. Obvious grain growth occurs in the original sintered structure, while the recrystallized microstructure produced by HPT deformation is still small after DSC testing. The average grain size is about 4-6 mu m. With the number of revolutions increasing, grain size does not change significantly and the deformed tissue is relatively stable.