|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Technology 2018
||Strengthening of a Biodegradable Mg-Zn-Ca Alloy ZX50 after Processing by HPT and Heat Treatment
||Andrea Ojdanic, Erhard Schafler, Jelena Horky, Michael Josef Zehetbauer, Dmytro Orlov
|On-Site Speaker (Planned)
This study investigates the strength increase and corrosion behavior in the Mg-Zn-Ca biodegradable alloys Mg-5Zn and Mg-5Zn-0.3Ca after SPD-processing (i.e. HPT High-Pressure-Torsion) and long-term heat treatments, with respect to vacancy clustering and the evolution of intermetallic precipitates. The Zn atoms act as trapping sites for vacancies, thus inducing vacancy agglomeration; besides, special nanostructured <c>-axis rod type, basal, and prismatic platelets are produced with the aim to achieve both a strength increase and a simultaneous decrease of corrosion, which is often too high for this type of Mg alloys for their use as biodegradable implants. Overall strength increases of up to 200% with almost identical corrosion rate could be reached,thus representing an attractive improvement of mechanical properties of the actual alloy. Quantitative determinations of the hardening contributions from vacancy agglomerates and from the precipitates are under progress. Work supported by the Austrian Science Fund under project I2815-N36.