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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (20권6호 395-399)

The Effect of Ca Addition on the Grain Refinement and Mechanical Properties in Mg-Zn Alloy

Mg-Zn 합금의 결정립미세화와 기계적 성질에 미치는 Ca 첨가의 영향

Jeong-Pil Eom, Su-Gun Lim, Bo-Young Hur

Gyeongsang National Univ.

Abstract

The main interdendritic phase which was formed during early solidification of the ternary Mg-Zn-Ca alloys is the CaQMg6Zn3 phase. The microstructure of Mg-6wt%Zn-0.l~0.3wt%Ca alloys consisted of MgZn precipitates and Ca2Mg6Zn3 phase formed around the grain boundaries. In the alloys with the highest level of Ca(Mg-6wt%Zn- 0.5~0.7wt%Ca alloys), the microstmcture revealed wholly Ca2Mg6Zn3 phase formed around the grain boundaries. The grain size of Mg-6wt%Zn-Ca alloys decreased significantly with increase in Ca content and, at 0.5wt% Ca or more, grain size becomes constant at about 60 um. The tensile properties of the as-cast Mg-6wt%Zn-Ca magnesium alloys were improved due to grain refinement by addition of Ca.

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