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Ca첨가 반응고 AZ31 마그네슘 합금의 재가열에 따른 미세조직 변화
김희경 ( Hee Kyung Kim ),성봉학 ( Bong Hak Seong ),반근호 ( Geun Ho Van ),김대환 ( Dae Hwan Kim ),성영록 ( Yeong Rok Seong ),임수근 ( Su Gun Lim ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.2
In this study, we are aimed to prevent grain growth of semi-solid AZ31 magnesium alloys during reheating process. The semisolid AZ31+(Ca) billets were investigated by using metallographic analysis, X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy in order to elucidate the effect of Ca addition during reheating process. The grain growth of semisolid AZ31+(Ca) billet was reduced with increasing Ca content during reheating. The grain size of AZ31+(Ca) billet decreased with increasing volume fraction of Al2Ca particles. The grain growth rate constant K calculated by Oswald ripening LSW theory in AZ31+1.5wt.% Ca billet was the lowest 129.