Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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The Effect of Electromagnetic Vibration on Eutectic Si Size in Hypoeutectic Al-Si alloys

아공정 Al-Si합금에 있어서 공정 Si크기에 미치는 전자기진동의 영향

  • Choi, Jung-Pyung (Dept. of Metallurgical Engineering Hanyang University) ;
  • Yoon, Eui-Pak (Dept. of Metallurgical Engineering Hanyang University) ;
  • Nam, Tae-Woon (Dept. of Metallurgical Engineering Hanyang University)
  • 최정평 (한양대학교 금속재료공학과) ;
  • 윤의박 (한양대학교 금속재료공학과) ;
  • 남태운 (한양대학교 금속재료공학과)
  • Published : 2004.04.20
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Abstract

In this study, the electromagnetic vibration is adopted for modifying eutectic Si phase and reducing its size. The higher the current density and frequency of electromagnetic vibration(EMV), the finer the size of eutectic Si phase. The tensile strength and elongation of EMVed alloy were highly improved. Measured twin probability of EMVed alloy at a frequency of 1000 Hz was approximately six times as high as that of the normal alloy. The mechanism for the increase in twin density due to EMV during solidification could be supposed from the fact that the preferential growth along <112> in silicon was suppressed by preventing Si atom from attaching to the growing interface of Si phase and by changing the solid/liquid interfacial energy of silicon. According to the result of UTS test, because of modification of eutectic Si, UTS and elongation are highly increased.

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References

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