Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Refinement Behavior of Coarse Magnesium Powder by High Energy Ball Milling (HEBM)

고에너지 밀링공정을 이용한 조대 마그네슘 분말의 미세화 거동

  • Song, Joon-Woo (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University) ;
  • Kim, Hyo-Seob (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University) ;
  • Kim, Hong-Moule (Hana Industries Co., Ltd.) ;
  • Kim, Taek-Soo (Dept. Of Echo-materials and processing, Korea Institute of Industrial Technology (KITECH)) ;
  • Hong, Soon-Jik (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University)
  • 송준우 (공주대학교 신소재공학부 및 희소금속 연구소) ;
  • 김효섭 (공주대학교 신소재공학부 및 희소금속 연구소) ;
  • 김홍물 ((주)하나산업) ;
  • 김택수 (한국생산기술연구원) ;
  • 홍순직 (공주대학교 신소재공학부 및 희소금속 연구소)
  • Received : 2010.07.06
  • Accepted : 2010.07.30
  • Published : 2010.08.28
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Abstract

In this research, the refinement behavior of the coarse magnesium powders fabricated by gas atomization was investigated as a function of milling time using a short duration high-energy ball milling equipment, which produces fine powders by means of an ultra high-energy within a short duration. The microstructure, hardness, and formability of the powders were investigated as a function of milling time using X-ray diffraction, scanning electron microscopy, Vickers micro-hardness tester and magnetic pulsed compaction. The particle morphology of Mg powders changed from spherical particles of feed metals to irregular oval particles, then platetype particles, with increasing milling time. Due to having HCP structure, deformation occurs due to the existence of the easily breakable C-axis perpendicular to the base, resulting in producing plate-type powders. With increasing milling time, the particle size increased until 5 minutes, then decreased gradually reaching a uniform size of about 50 micrometer after 20 minutes. The relative density of the initial power was 98% before milling, and mechanically milled powder was 92~94% with increase milling time (1~5 min) then it increased to 99% after milling for 20 minutes because of the change in particle shapes.

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