Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Ball milling Time on Graphite Dispersion and Mechanical Properties in Rapidly Solidified 6061 Al Composite

급속응고 6061Al/Graphite 복합재료의 볼밀링 시간에 따른 흑연 분산거동 및 기계적 특성

  • Son, Hyeon-Taek (Automotive Components Service Center, Korea Institute of Industrial Technology) ;
  • Lee, Jae-Seol (Automotive Components Service Center, Korea Institute of Industrial Technology) ;
  • Hong, Soon-Jik (Division of Advanced Materials Engineering, Kongju National University) ;
  • Chun, Byong-Sun (Division of Nano Materials Engineering, Chungnam National University)
  • 손현택 (한국생산기술연구원 동력부품지원센터) ;
  • 이재설 (한국생산기술연구원 동력부품지원센터) ;
  • 홍순직 (공주대학교 신소재공학부) ;
  • 천병선 (충남대학교 나노공학부)
  • Published : 2009.06.28
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Abstract

A composite of rapidly solidified Al-6061 alloy powder with graphite particle reinforcements was prepared by ball milling and subsequent hot extrusion. The microstructure and mechanical properties of these composites were investigated as a function of milling time. With increasing milling time, the gas atomized initially and spherical powders became elongated with a maximum aspect ratio after milling for 30 h. Then, refinement and spheroidization were achieved by further milling to 70 h with a homogeneous and fine dispersion of graphite particles forming between the matrix alloy layers. The best compression and wear properties were obtained in the powder milled for 70 h, associated with the increased fine and homogeneous distribution of graphite particles in the aluminum alloy matrix.

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References

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