한국주조공학회지 (Journal of Korea Foundry Society)

  • 제19권5호
  • /
  • Pages.433-439
  • /
  • 1999
  • /
  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
권호 표지

급냉응고된 Mg-Al-Si-xCa 합금의 시효경화 및 미세조직

Age Hardening and Microstructure in Rapidly Solidified Mg-Al-Si-xCa Alloys

  • 김완철 (홍익대학교 금속공학과) ;
  • 박지하 (홍익대학교 금속공학과) ;
  • 류봉선 (한국기계연구원 재료기술연구부) ;
  • 박원욱 (한국기계연구원 재료기술연구부)
  • Kim, Wan-Chul (Department of Metallurgical Engineering, Hongik University) ;
  • Park, Ji-Ha (Department of Metallurgical Engineering, Hongik University) ;
  • You, Bong-Sun (Materials Engineering Department, Korea Institute of Machinery & Materials) ;
  • Park, Won-Wook (Materials Engineering Department, Korea Institute of Machinery & Materials)
  • 발행 : 1999.10.20
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초록

Rapidly solidified Mg-Al-Si base alloys containing Ca were obtained by melt spinning. The melt-spun ribbons were aged isochronally or isothermally to investigate age hardening phenomena and microstructural change according to the alloy composition. Age hardening occurred after aging at $200^{\circ}C$ for 1h mainly due to the precipitation of $Al_2Ca$ and $Mg_2Ca$, which have coherent interfaces with the matrix. With the increase of Ca content, the hardness values of the alloy ribbons were increased. Among the alloys, Mg-10Al-2 Si-3Ca alloy showed a good thermal stability at elevated temperature.

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