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Laves phases often form as secondary phases in metallic alloys and have asignificant effect on their structural properties. Thus, phase stabilitystudies for these chemically and structurally complex phases in addition tomechanical behavior studies are of great interest. In this work, we use theconcept of metastable bulk phase and defect phase diagrams to augment theunderstanding of the bulk phase and defect phase stability in Laves phases inMg-based alloys. In this way, we resolve the discrepancy between bulk phasediagrams and experimental observations regarding the formation of Mg-rich C14and Al-rich C15 Laves phases in MgAlCa alloys at moderate temperatures.Moreover, the effect of the thermodynamic state of alloys on the competitionbetween solute-rich hcp-like planar defects and stoichiometric basal stackingfaults is clarified, which determines the brittleness of these alloys.\end{abstract}

Phase stability and defect studies of Mg-based Laves phases using defect phase diagrams