Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effects of Sc on the Microstructures of Hypereutectic Al-Si Alloys

과공정 Al-Si 합금의 미세조직에 미치는 Sc의 영향

  • Jeong Y. S. (Department of Materials Engineering, Chungbuk National University) ;
  • Kim M. H. (Department of Materials Engineering, Chungbuk National University) ;
  • Choi S. H. (Department of Materials Engineering, Chungbuk National University)
  • 정유성 (충북대학교 공과대학 재료공학과) ;
  • 김명한 (충북대학교 공과대학 재료공학과) ;
  • 최석환 (충북대학교 공과대학 재료공학과)
  • Published : 2005.07.01
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Abstract

Sc has been known to be an very effective ppt-hardening element in Al and Al alloys and also to be effective in modification of eutectic Si in hypoeutectic Al-Si alloys. The modification mechanism of Sc is different from that of the traditional modifier Sr in Al-Si alloys. In the present study the effects of Sc on the primary and eutectic Si in hypereutectic Al-Si alloys were investigated with evaluating the microstructures with OM, EPMA and EBSD methods. The results represent that Sc has only a small effect on primary Si when added less than $0.8wt\%$. However, when Sc addition leading to the precipitation of metallic Sc within primary Si reaches $1.6wt\%$, very coarse primary Si occurs.

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