12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Biomedical Applications II
Program Organizers: Alan Luo, Ohio State University; Mihriban Pekguleryuz, McGill University; Sean Agnew, University of Virginia; John Allison, University of Michigan; Karl Kainer; Eric Nyberg, Kaiser Aluminum Trentwood; Warren Poole, University of British Columbia; Kumar Sadayappan, CanmetMATERIALS; Bruce Williams, Canmetmaterials Natural Resources Canada; Stephen Yue, Mcgill University
Tuesday 10:50 AM
June 15, 2021
Room: Contributed IV
Location: Virtual
Session Chair: Manoj Gupta, National University of Singapore
Towards Digital Manufacturing of Biodegradable Magnesium Implants: Mojtaba Salehi1; Viktor Rudel2; Eva Berckmann3; Sara Kaabi4; Gerard Ong1; Jan-Marten Seitz5; Jannik Reisberg2; Philipp Ganser2; Hang Li Seet1; Sharon Nai1; Thomas Bergs6; 1Singapore Institute of Manufacturing Technology; 2Fraunhofer Institute for Production Technology IPT; 3ModuleWorks GmbH; 4Syntellix Asia Pte Ltd; 5Syntellix; 6Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University
As the third generation of biomaterials, magnesium (Mg) is a promising candidate for biomedical applications. The traditional manufacturing methods are unable to produce complex geometries required for implants. Advancing manufacturing technologies could open a new window of opportunity for Mg alloys. This study aimed to develop an end-to-end manufacturing solution that enables the fabrication of customized porous Mg implants for craniomaxillofacial applications. Powder-bed inkjet 3D printing method followed by a sintering process was used to fabricate implant-like Mg components with an interconnected porous structure having more than 10 % of overall porosity. Then, clamping fixtures for a three-step machining process together with the adaptive CAM program for tool path planning and collision checking were successfully developed, enabling automated milling of the near-net-shape fabricated Mg implant. Overall, this combination of AM and the automatic post-machining process introduced in the current work will revolutionize the future of Mg alloys for implant applications.
Effect of Adding Zinc and Calcium Solute on Mechanical Properties in Magnesium Fine Wires: Hiroki Sannomiya1; 1Kobe University
In recent years, surgical sutures are made from bioabsrbable polymers due to the benefit for avoiding removal operation. Magnesium alloys are possible candidates for bioabsorbable sutures because of their biocompatibility and degradability. Since the drawing is suitable for manufacturing a metallic fine wire, we clarify the effect of additive elements, calcium or zinc, on mechanical properties of drawn magnesium wires. Binary alloys of Mg-Ca (0.1 to 0.3 at%) and Mg-Zn (0.1 to 0.3 at%) were cast followed by extrusion. The extrusions were drawn to fabricate a fine wire having a diameter of 0.2 mm. Tensile tests were conducted for the wires. As a result, yield stress increased with increasing the content of solute elements, while the work hardening rate and tensile ductility were varied with the kind of additive element. Inspect of the drawn microstructure revealed that the additive element plays an important role for microstructure evolution in magnesium.