Additively manufactured (AM) metamaterials with unparallel mechanical and biological properties have been of interest for many biomedical, aerospace, and defense applications. In this study, new findings on the structure-property relationships of a specific class of AM meta-biomaterials based on minimal surfaces which have not been well understood previously (i.e., Primitive and Schoen-IWP (IWP)) are presented. Biocompatible Ti-6Al-4V meta-biomaterials based on Primitive and IWP topologies, with three different morphological properties for each, were designed and fabricated via laser powder bed fusion technique. The microstructure, morphological, quasi-static compressive, flexural properties, and fracture mechanisms of the designed meta-biomaterials are thoroughly evaluated. Studied meta-biomaterials exhibited distinct fracture mechanisms under flexural loading depending on their topology; crack growth path was either zigzag (i.e., deflected) or straight. Additionally, Primitive meta-biomaterials exhibited ductile material behavior, under both compressive and flexural loading conditions, with pore size, porosity, and elastic gradient similar to the trabecular bone (850–1020 μm, 40–64%, and 3200–6000 MPa). However, IWP meta-biomaterials showed brittle behavior with porosity and elastic gradient closer to cortical bone (20–42% and 7000–13,000 MPa). These outcomes indicate that both mechanical behavior and fracture mechanisms of meta-biomaterials can be controlled based on topology and morphology.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering