pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (38권4호 75-81)
Effect of CaMgSn Ternary Phase on the Aging Response of Mg-Sn-Zn-Ca Alloys
Effect of CaMgSn Ternary Phase on the Aging Response of Mg-Sn-Zn-Ca Alloys
Shah Abdul Wahid1, 2, Hyun-Kyu Lim2*, Young-Gil Jung2, Won-Seok Yang2, Seong-Ho Ha2, Young-Ok Yoon2, and Shae K. Kim1, 2
1 Korea University of Science and Technology, 34113 Daejeon, South Korea, 2 Korean Institute of Industrial Technology, 21999 Incheon, South Korea
This study examined the effect of the CaMgSn ternary phase on the aging response of the Mg-Sn-Zn alloy . The results revealed that the CaMgSn ternary phase formed in rod-like or needle-like shapes in Mg-3Zn-0.3Ca-xSn (x=1.5, 3, and 5wt%) alloys and its size decreased as the Sn content increased from 1.5wt% to 5wt%. The Mg- 3Zn-0.3Ca-5Sn alloy with a relatively fine CaMgSn phase was subjected to solution heat treatment and an aging process. Both the Mg-5Sn-3Zn-0.3Ca and Mg-5Sn-3Zn (base alloy) alloys had similar peak hardness values throughout all aging temperatures but the time-to-peak hardness in the Mg-5Sn-3Zn-0.3Ca alloy was 24-36 hours-earlier than that in the base alloy. Precipitates in the Mg-5Sn-3Zn-0.3Ca alloy were more refined than those in the Mg-5Sn-3Zn alloy and were mostly formed on basal planes. The Mg2Sn phase formed in either plate-like or rod-like shapes in the Mg-5Sn-3Zn alloy, whereas block-shaped Mg2Sn particles also formed in the Mg-5Sn-3Zn-0.3Ca alloy.
Mg-Sn-Zn system, CaMgSn ternary phase, precipitation hardening, transmission electron microscopy
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