한국주조공학회지 (Journal of Korea Foundry Society)

  • 제18권5호
  • /
  • Pages.439-449
  • /
  • 1998
  • /
  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
권호 표지

알루미늄합금 용탕중의 산화개재물 형성

Formation of Oxide Inclusions in the Molten Aluminium Alloys

  • 임정호 (한양대학교 금속공학과) ;
  • 김기배 (한국과학기술연구원 금속연구부) ;
  • 윤우영 (고려대학교 금속공학과) ;
  • 윤의박 (한양대학교 금속공학과)
  • Lim, Jeong-Ho (Dept. of Metallurgical Eng., Hanyang University) ;
  • Kim, Ki-Bae (Division of Metals, Korea Institute of Science and Technology) ;
  • Yoon, Woo-Yung (Dept. of Metallurgical Eng., Korea University) ;
  • Yoon, Eui-Pak (Dept. of Metallurgical Eng., Hanyang University)
  • 발행 : 1998.10.20
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초록

Formation of oxide inclusions in the molten aluminium alloys during solidification is investigated. The oxidation tendency of both Al-4.5wt%Cu and Al-7wt%Si alloys is increased with melt temperature, particularly over $700^{\circ}C$. However, an Al-5wt%Mg alloy exhibits a decreasing mode over $800^{\circ}C$. The oxidation behavior with holding time shows the S curve shape for all of the alloys. It is shown that the mechanism of oxidation of Al-5wt%Mg alloy has a two step process different from that of Al-4.5wt%Cu and Al-7wt%Si alloys. The species and morphology of oxide inclusions in each alloy is also shown. The microstructure was more coarsened during solidification when the melt contains a large amount of oxide inclusion than when it doesn't. This result can be explained in terms of both the hindrance of heat extraction by oxide film formed on the aluminium melt and the difference of heat capacity between the aluminium melt and oxide inclusion during solidification.

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