Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Influence of Melt Processing Factors on Microstructures of SiCp/Ma-Al Composites

SiCp/Mg-Al 복합재료의 조직에 미치는 용융가공의 영향

  • Yoon, Yeo-Chang (Material Research Institute, Kumkang Dengen Metal Co., Ltd.) ;
  • Choi, Jeong-Cheol (Dept. of Material Science and Eng., Ajou University) ;
  • Nam, Tae-Woon (Dept. of Metallurgical Eng., Hanyang University) ;
  • Park, Ik-Min (Dept. of Metallurgical En., Pusan National University)
  • 윤여창 (금강전원금속(주) 소재연구소) ;
  • 최정철 (아주대학교 재료공학과) ;
  • 남태운 (한양대학교 금속재료공학과) ;
  • 박익민 (부산대학교 금속공학과)
  • Published : 1993.08.30
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Abstract

Mg-9wt.%Al and Mg-9wt.%-1.6wt%Zn/SiCp(particle size $40{\mu}m$) metal-matrix-composite specimens were manufactured by rheo-compocasting method, known for its effect of improving the wettability. The ceramic reinforcement particles(SiCp) were dispersed in the semi-solid magnesium alloy matrix slurry being vigorously stirred in a high frequency induction furnace under inert atmosphere. A microstructural study of the dispersed particles in the specimens, prepared under different conditions as regards the time(10min, 20min, 30min) and temperature of the stirring, was made with the aid of optical microscope and SEM. The effect of superheating was also observed. It is revealed that 30 minutes' stirring time of the semi-solid at 40% solid fraction temperature(Mg-9wt.%Al : $590^{\circ}C$, AZ91 : $576^{\circ}C$), as determined by the lever rule, gives a satisfactorily uniform distribution of the particles. The superheating is observed to enhance further the uniformity.

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