Abstract
Microstructural changes with varying amounts of Ca in cast AZ31-xCa (x: 0.7 wt.%, 2.0 wt.%, 5.0 wt.%) alloys were investigated. According to transmission electron microscopy (TEM) analyses, it was experimentally confirmed that the C36-(Mg,Al)2Ca phase with a di-hexagonal structure formed at interdendritic regions in as-cast AZ31 alloys with no more than 2 wt.% Ca. On the other hand, as the Ca content exceeded 2 wt.%, the lamellar structure consisting of the α-Mg phase and the Mg2Ca phase with a C14 structure formed at interdendritic regions instead of C36 phase. Plate-like Al2Ca precipitates with a C15 structure also formed on the basal plane inside the α-Mg grains.
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Kim, Y.M., Yim, C.D. & You, B.S. Effect of the Ca content on the microstructural evolution of Ca containing AZ31 cast alloys. Met. Mater. Int. 17, 583–586 (2011). https://doi.org/10.1007/s12540-011-0815-7
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DOI: https://doi.org/10.1007/s12540-011-0815-7