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http://dx.doi.org/10.12656/jksht.2014.27.4.185

Effect of Sn Addition on Creep Resistance of AZ91-0.4%Ca Alloy  

Jun, Joong-Hwan (Advanced Fusion Process and Materials R&BD Group, Korea Institute of Industrial Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.27, no.4, 2014 , pp. 185-190 More about this Journal
Abstract
The influences of small amount of Sn addition on microstructure and creep resistance of AZ91-0.4%Ca alloy have been investigated. The microstructure of the AZ91-0.4%Ca alloy was characterized by ${\alpha}$-(Mg) dendrite cells surrounded by eutectic ${\beta}(Mg_{17}Al_{12})$ and $Al_2Ca$ phases. The 0.5%Sn addition resulted in the formation of rod-shaped CaMgSn particles with the extinction of $Al_2Ca$. The Sn-containing alloy exhibited better creep resistance below $175^{\circ}C$, but the tendency was reversed above $200^{\circ}C$. The reason was discussed in relation to the change in thermal stability of ${\beta}$ phase in response to the Sn addition.
Keywords
Mg-Al-Ca; Sn; ${\beta}$ phase; CaMgSn; Creep resistance;
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