Significance of temperature increase in processing by high-pressure torsion

Experiments and finite element simulations were conducted to measure the temperature increase in processing disc samples by high-pressure torsion. Aluminum, copper, iron and molybdenum were selected as model materials. The temperature increases at the early stages of straining but saturates to steady-state levels at large strains. The increase of temperature is proportional to the hardness and rotation speed and is higher at higher imposed pressures and is somewhat higher at larger distances from the disc center.

► Temperature increases in processing disc samples by high-pressure torsion.
► Experiments and finite element simulations were conducted to measure the temperature increase.
► The temperature increases significantly at the early stages of straining but saturates at large strains.
► The extent of temperature increase is proportional to the microhardness and rotation speed.
► The temperature increase is higher at higher pressures and longer distances from the disc center.