In this study, the behavior of densification of copper powders during high-pressure torsion (HPT) at room temperature is investigated using the finite element method. The simulation results show that the center of the workpiece is the first to reach the true density of copper during the compressive stage because the pressure is higher at the center than the periphery. Subsequently, whole workpiece reaches true density after compression due to the high pressure. In addition, the effective strain is increased along the radius during torsional stage. After one rotation, the periphery shows that the effective strain is increased up to 25, which is extensive deformation. These high pressure and severe strain do not only play a key role in consolidation of copper powders but also make the matrix harder by grain refinement.

• 이동준(한국기계연구원 부설 재료연구소 공정실용화센터 소재성형팀) | Dong Jun Lee
• 윤은유(한국기계연구원 부설 재료연구소 공정실용화센터 소재성형팀) | Eun Yoo Yoon Corresponding Author