Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Ultrafine Grained Cu-diamond Composites using High Pressure Torsion

고압비틀림 공정으로 제조된 구리-다이아몬드 초미세립 복합재료

  • Yoon, Eun-Yoo (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Lee, Dong-Jun (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Taek-Soo (Department of Rare Metals, Korea Institute of Industrial Technology (KITECH)) ;
  • Kim, Hyoung-Seop (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
  • 윤은유 (포항공과대학교 신소재공학과) ;
  • 이동준 (포항공과대학교 신소재공학과) ;
  • 김택수 (한국생산기술연구원 희소금속산업기술센터) ;
  • 김형섭 (포항공과대학교 신소재공학과)
  • Received : 2012.03.23
  • Accepted : 2012.04.18
  • Published : 2012.06.28
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Abstract

In this work, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Pure Cu powders were mixed with 5 and 10 vol% diamonds and consolidated into disc-shaped samples at room temperature by HPT at 1.25 GPa and 1 turn, resulting in ultrafine grained metallic matrices embedded with diamonds. Neither heating nor additional sintering was required with the HPT process so that in situ consolidation was successfully achieved at ambient temperature. Significantly refined grain structures of Cu metallic matrices with increasing diamond volume fractions were observed by electron backscatter diffraction (EBSD), which enhanced the microhardness of the Cu-diamond composites.

Keywords

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