  Magnesium (Mg) alloys have emerged as promising materials due to their low
density and high strength-to-weight ratio, offering a wide range of
applications across multiple industries. Nevertheless, the inherent brittleness
of Mg alloys poses a significant hurdle, necessitating innovative approaches to
enhance their mechanical performance. Among the various strategies,
manipulating stacking fault energy (SFE) has been a key focus, although
primarily within the realm of binary alloys. This study investigates SFE in Mg
alloys, focusing on ternary compositions. Utilizing first-principles DFT
calculations, we analyze solute interactions and their influence on SFE,
particularly in Mg-Al-X and Mg-Zn-X configurations. Predictive models are
developed for estimating SFE effects, revealing solute pairs that mimic rare
earth elements and show potential for improved ductility. The findings
contribute to fundamental insights into Mg alloy behavior, offering practical
directions for designing advanced materials with superior mechanical
properties.
