This study examines Gd additions and thermomechanical processing effects on corrosion rates in magnesium alloys, suggesting improvements in biodegradable implants.
Magnesium alloys show promise as biodegradable implants but require degradation rate control. This study examines Gd additions (0–2 wt.%) and thermomechanical processing (hot rolling, extrusion) on Mg-2Zn-0.5Y alloys. XRD and microscopy reveal Gd forms Mg 3 Zn 3 Gd 2 phases, refining grains to ∼205 μm without altering the α-Mg matrix. Hardness increases with Gd content due to precipitation and Hall-Petch strengthening from dynamic recrystallization. However, Gd elevates galvanic corrosion between Mg 3 Zn 3 Gd 2 and the matrix, raising corrosion rates by ∼48% at 2 wt.% Gd. Extrusion mitigates galvanic effects, reducing corrosion versus as-cast alloys. These insights on synergies between composition, microstructure, and thermomechanical processing advance knowledge for designing biodegradable Mg implants with tailored degradation.
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Amin et al. (2025) studied this question.
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