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J Nanosci Nanotechnol. 2019 Mar 1;19(3):1820-1823. doi: 10.1166/jnn.2019.16225.

Effect of Ca on Phase Stability and Oxidation Resistance of Al₃Mg₂ at Elevated Temperature.

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Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea.
Extreme Fabrication Technology Group, Korea Institute of Industrial Technology, 320 Techno Sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 42994, Korea.


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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