Yttrium (Y) is an effective alloying element for tuning the overall performance of magnesium (Mg) alloys. However, the optimal content of Y in low-alloyed magnesium alloys and the synergistic mechanism between degradation rate and mechanical properties is still unclear. The current study investigates the effects of Y addition on the microstructure, mechanical properties and degradation rate of as-extruded Mg-1Bi-0.5Sc alloy in 3.5 wt.% NaCl solution. Studies have shown that the addition of Y pro