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Characteristics of the Unidirectionally Solidified Al-Co Alloy  

Park, Su-Jung (Dept. of Metallugical and material Eng., Chosun University)
Jun, Hyun-Yong (Dept. of Metallugical and material Eng., Chosun University)
Lee, Hyun-Kyu (Dept. of Metallugical and material Eng., Chosun University)
Publication Information
Journal of Korea Foundry Society / v.25, no.1, 2005 , pp. 30-35 More about this Journal
Abstract
The structures and mechanical property of the unidirectionally solidified Al-Co eutectic alloy were investigated. Al-Co eutectic alloy was unidirectionally solidified with growth rates(R) between I cm/hr and 10 cm/hr in the induction furnace maintaining the thermal gradient (G) at solid-liquid interface, $32^{\circ}C$/cm. The eutectic microstructure was varied with the growth condition(G/R ratio). When the G/R ratio was larger than $8.5{\times}10^{3}^{\circ}C/cm^{2}/sec$, a lamellar structure was formed, But the G/R ratio was smaller than $8.5{\times}10^{3}^{\circ}C/cm^{2}/sec$, a colony structure was formed. It was found that the interlamellar spacing(${\lambda}$) was dependent on the growth rate(R) with the relationship, ${\lambda}^{2}{\cdot}R=constant$. The microhardness of this eutectic alloy increased with increase in the growth rate.
Keywords
Solid-liquid interface; Colony structure; Thermal gradient;
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