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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.11 (2015)  >  pp.1887-1892

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Investigation of Thermal Conductivity and Mechanical Properties of Mg-4Zn-0.5Ca-xY Alloys

Gun-Young Oh1) 2), Young-Gil Jung1), Wonseok Yang1), Shae K. Kim1), Hyun Kyu Lim1), Young-Jig Kim2)
1) Rare Metal R&D Group, Korea Institute of Industrial Technology 2) School of Advanced Materials Science and Engineering, Sungkyunkwan University

The thermal conductivities of quaternary Mg-Zn-Ca-Y alloys have been investigated by evaluating the effect of adding Y on the Mg-4Zn-0.5Ca alloys, with an emphasis on developing new Mg alloys without compromising their thermal conductivities, processabilities, and mechanical properties.
In this study, to improve the mechanical properties of the Mg-4Zn-0.5Ca alloy, Y was chosen as a strengthening element, and the effect of adding Y on the thermal and mechanical properties of the alloy was investigated. The thermal conductivities slightly decreased as the Y-content increased. However, the tensile yield strength and ultimate tensile strength improved as the Y-content increased. In addition, the average spiral flow lengths of the Mg-Zn-Ca-xY alloys were almost the same as that of the Mg-Zn-Ca alloy. The results of this study indicate that Mg-Zn-Ca alloys with more than 1 mass% Y exhibit better mechanical properties and thermal conductivities than gravity-cast AZ91 alloys.

magnesium-zinc-calcium-yttrium, thermal conductivity, fluidity, microstructure, mechanical properties

Received: July 29, 2015
Accepted: August 25, 2015 , Published online: October 25, 2015



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