Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method

유한요소해석을 이용한 고압비틀림 공정 중의 구리 분말의 치밀화 및 고형화 거동 분석

  • Lee, Dong Jun (Materials Deformation Team, Process Commercialization Center, Korea Institute of Materials Science(KIMS)) ;
  • Yoon, Eun Yoo (Materials Deformation Team, Process Commercialization Center, Korea Institute of Materials Science(KIMS))
  • 이동준 (한국기계연구원 부설 재료연구소 공정실용화센터 소재성형팀) ;
  • 윤은유 (한국기계연구원 부설 재료연구소 공정실용화센터 소재성형팀)
  • Received : 2015.01.14
  • Accepted : 2015.02.10
  • Published : 2015.02.28
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Abstract

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.

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