발간논문

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Vol.34, No.12, 1558 ~ 1567, 1996
Title
Research Paper - Transformations - : Effects of additions of Ca and P on the Microstructure of Squeeze Cast Mg - Al - Zn - Si Alloys
김재중Jae Joong Kim, 김도향Do Hyang Kim, 박성진Sung Jin Park, 신철수Chirl Soo Shin, 김낙준Nack Joon Kim
Abstract
Effects of alloying elements such as Ca and P on the microstructure of squeeze cast Mg-Al-Zn-Si alloys have been investigated in the present study. Addition of Si in Mg-Al-Zn alloys results in the formation of Mg₂Si in two types of morphologies; polygonal type and chinese script type. With increasing Al content the formation of polygonal type Mg₂Si is pronounced. Addition of Ca results in the homogeneous distribution of fine polygonal Mg₂Si particles. Ca is segregated mainly around the secondary phase such as Mg_(17)Al_(12), P provides the nucleation sites for Mg₂Si, results in the homogeneous distribution of the fine polygonal Mg₂Si particles. Accordingly, Ca and P containing Mg-Al-Zn-Si alloys have the much finer microstructure than those with no Ca and P since the fine polygonal Mg₂Si particles restrict the grain growth of Mg alloys during squeeze casting and subsequent heat treatment.
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