Effects of Zn and Ca Additions on the Solidification Behavior and Microstructure Analysis of Mg and Mg–6Zn Alloys
In this paper the influence of Zn and Ca additions on solidification behavior and microstructure analysis of Mg–6Zn and Mg–6Zn–4.5Ca alloys were investigated. Solidification behavior was evaluated by two thermocouple thermal analysis method. Microstructure and phase identification were performed via OM, SEM and EDX analysis. First derivative curves of Mg–6Zn alloys reveals two peaks related to α-Mg and MgZn at 520 and 370 °C respectively, While in Mg–6Zn–4.5Ca three peaks were detected. The microstructure result shows that the Cacontaining phase formation related to Ca content and Zn/Ca ratio in Mg–6Zn–4.5Ca. Thus the microstructure of Mg–6Zn–4.5Ca consists of primary Mg and eutectic (α-Mg+Mg2Ca+Ca2Mg6Zn3) phases. However the microstructure of Mg–6Zn composed of primary Mg and the second phase γ-MgZn which precipitate within the grain boundary. Thermal analysis result also exhibited that the addition of Zn elements to Mg alloy decreased the fraction of dendrite coherency point (f DCP α ) whilst the f DCP α increased by adding Ca to Mg–6Zn. Moreover coherency time increased with the addition of Zn and combination of Zn and Ca elements to Mg alloy.
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Document Type: Research Article
Publication date: December 1, 2013
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