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Effect of Ca on Phase Stability and Oxidation Resistance of Al₃Mg₂ at Elevated Temperature
Seong-Ho Ha1, Won-Min Do1, Bong-Hwan Kim1
1Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea.
Abstract:
In this study, effect of Ca on phase stability and oxidation of Al₃Mg₂ at elevated temperature was investigated. From thermogravimetric analysis (TGA) at 420 °C, rapid weight gains in the initial stage and incubation were observed for Al₃Mg₂ and Ca-added Al₃Mg₂. After incubation for some time, Al₃Mg₂ sample exhibited the second weight growth, while Ca added sample exhibited continuous incubation during the testing time. The phase diagrams calculated by Factsage 7.1 revealed that Ca exists as Laves_C36 in Al₃Mg₂ and also forms Ca₃MgAl₄O10, following formation of MgO and MgAl₂O₄-spinel as primary and secondary oxides, respectively, on the surface during oxidation at 420 °C.
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