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Environmental gains of electric cars can be optimized with the use of lightweight and recyclable magnesium in the vehicle's structural components. Ductility improvement of low-density Mg-Al alloys will extend their use in automotive body applications. The authors achieved 63% ductility improvement in Mg-6wt%Al with trace Y (1.5 ppm) due to the β-phase refinement and predicted that higher levels would not perform as well. As predicted, 0.3wt% of Y addition investigated in this study led to lowerdoi:10.1017/exp.2020.63 fatcat:5xwux6ok5vcbfafwmo6cmclhta