Petra Maier¹, Benjamin Clausius¹, Norbert Hort²; ¹Stralsund University of Applied Sciences, ²Helmholtz-Zentrum Geesthacht

Microstructural changes of RESOLOY, a resorbable Mg-Dy based alloy, is focus of this study. Hardness and bending tests are used to monitor the changes in mechanical properties. Overall, stress corrosion on C-Ring tests are planned to evaluate the corrosion behavior. Hot-extruded tubes were solution heat-treated at different temperatures and times. The as-extruded condition shows a rather homogeneous fine-grained microstructure. Solution heat treatment at lower annealing temperatures and times does not change the microstructure much, but reduces the hardness by relieving work-hardening. Solution heat treatment at higher annealing temperatures and times (24 and 48h) causes grain growth and reduces hardness, the spread of data distribution increases. On the other hand, annealing at 72h increases hardness with reducing mean grain size. Earlier research showed that LPSO phases form during post heat treatment. As-extruded RESOLOY is not free of pitting corrosion, especially not near strain-hardened areas. Solution heat treatment improves the corrosion behavior.