Dresden 2017 – wissenschaftliches Programm
MM 11.2: Vortrag
Montag, 20. März 2017, 12:00–12:15, IFW D
Dealloying-based nanoporous metallic materials for orthopedic implant applications — •Ilya Okulov1, Artem Okulov1,2, Berengere Luthringer3, Jürgen Markmann1, Regine Willumeit-Römer3, and Jörg Weissmüller1 — 1HZG, Institute of Materials Research, Division of Materials Mechanics, Germany — 2Institute of Metal Physics, Ural Branch of RAS, Russia — 3HZG, Institute of Material Research, Division of Metallic Biomaterials, Germany
The close match of stiffness between orthopedic implant material and bone is critically important to ensure fast healing of injured tissues. Here, we propose a design strategy to develop metallic materials possessing Young's modulus matching that of human bone using liquid metal dealloying (LMD). LMD is a process of selective dissolution of one or several elements from the solid precursor into the liquid metal, while the remaining elements simultaneously organize and form a porous structure. To demonstrate our strategy, we developed interpenetrating-phase Ti-Mg composites and microporous TiZr alloys by LMD. The Young's modulus of the microporous TiZr alloys is adjustable in a range of 3.2 to 15.1 GPa by controlling metal fraction. The Young's modulus of the Ti-Mg composites can be as low as 25 GPa. These low values of Young's modulus become interesting in a view of high yield strength of the microporous TiZr and the Ti-Mg composites reaching up to 480 MPa and 450 MPa, respectively. This strongly suggests opportunities as future advanced implant materials will significantly enhanced performance.