2008 Volume 49 Issue 5 Pages 1081-1083
This study was carried out to examine reduction mechanism of CaO and to investigate behaviors of CaO in pure Mg in terms of microstructure, oxidation resistance and phase formation. Pure Mg was used instead of Mg alloys to minimize the effects of other elements. With respect to CaO content, microstructures of the alloys showed prominent grain refinement. Mg2Ca phase was formed even in 0.07CaO added pure Mg by reduction, while Mg2Ca phase was formed over 1.35Ca added pure Mg. With respect to CaO content, the hardness of CaO added pure Mg was increased by grain refinement. From oxidation test by TGA, the oxidation behavior of CaO added Mg was similar to that of Ca added Mg. From AES result, there was the thin oxide layer mixed with MgO and CaO in CaO added Mg.