한국주조공학회지 (Journal of Korea Foundry Society)

  • 제31권6호
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  • Pages.347-353
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  • 2011
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  • 1598-706X(pISSN)
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  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
권호 표지
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반응고 Al-Zn-Mg계 합금의 반용융 압출을 위한 재가열 시 결정립 성장 억제에 미치는 Ca 첨가의 영향

The Effect of Ca Addition on the Grain Growth Inhibition During Reheating Process of Al-Zn-Mg Al Alloys for Thixo-extrusion

  • 박형원 (경상대학교.아이큐브 센터.공학연구원) ;
  • 김대환 (경상대학교.아이큐브 센터.공학연구원) ;
  • 심성용 (경상대학교.아이큐브 센터.공학연구원) ;
  • 김희경 (경상대학교.아이큐브 센터.공학연구원) ;
  • 성봉학 (경상대학교.아이큐브 센터.공학연구원) ;
  • 최창옥 (한국과학기술정보연구원.ReSEAT 프로그램) ;
  • 임수근 (경상대학교.아이큐브 센터.공학연구원)
  • Park, Hyung-Won (Gyeongsang National University, i-Cube Center, Engineering Research Institute) ;
  • Kim, Dae-Hwan (Gyeongsang National University, i-Cube Center, Engineering Research Institute) ;
  • Shim, Sung-Yong (Gyeongsang National University, i-Cube Center, Engineering Research Institute) ;
  • Kim, Hee-Kyung (Gyeongsang National University, i-Cube Center, Engineering Research Institute) ;
  • Seong, Bong-Hak (Gyeongsang National University, i-Cube Center, Engineering Research Institute) ;
  • Choi, Chang-Ock (Korea institute of Science and Technology Information, ReSEAT program) ;
  • Lim, Su-Gun (Gyeongsang National University, i-Cube Center, Engineering Research Institute)
  • 투고 : 2011.09.06
  • 심사 : 2011.10.28
  • 발행 : 2011.12.31
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초록

There is thixo-extrusion to form high strength aluminum alloy. But, it is a problem that grains become grain coarsening during reheating process because the alloy was exposed at high temperature. In order to solve grain growth during reheating process, calcium was added in Al-Zn-Mg alloys. Primary a grain sizes of semi-solid Al-Zn-Mg-(0, 0.4, 0.6 and 0.9, wt.%)Ca were measured with image analyzer after reheating. Measured primary a grain sizes were applied to LSW(Lifshitz-Slyozov and Wagner) equation to check the effect of Ca on grain coarsening. Coarsening rate constant K values of semi-solid Al-Zn-Mg-(0, 0.4, 0.6 and 0.9, wt.%)Ca alloys were $371\;mm^3s^{-1}$, $247\;mm^3s^{-1}$, $198\;mm^3s^{-1}$ and $166 mm^3s^{-1}$, respectively. As increasing calcium content, K value decreased which means grains are refined. Also, grains of calcium addition were more spherical than that of calcium free.

키워드

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