About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Understanding Corrosion of AM Ti Alloys for Custom Orthopaedic Implants |
Author(s) |
Jessica Tjandra, Minh-son Pham, Enrique Alabort, Daniel Barba, Stella Pedrazzini |
On-Site Speaker (Planned) |
Jessica Tjandra |
Abstract Scope |
Additively manufactured (AM) Ti alloys are increasingly used in orthopaedic implants. In this study, the effect of simulated body fluid (SBF) exposure (pH = 7.40) on the mechanical performance of AM Ti-6Al-4V was investigated. The mechanical properties of tensile samples decreased with SBF exposure, suggesting an embrittlement phenomenon from hydrogen, oxygen or chlorine in SBF. Stochastic lattices exposed to SBF tested under cyclic compressive loading failed at a lower number of cycles compared to pristine lattices, and thinner struts are more severely affected by SBF than thicker struts. Lattice samples failed at nodes, with unmelted powder acting as fatigue initiation sites. Advanced characterisation techniques such as STEM-EDX and APT are used to measure oxygen concentration at fatigue crack tips, suggesting oxygen embrittlement and different diffusion behaviour in different crystal orientations in alpha-Ti phase. Understanding corrosion fatigue behaviour of AM Ti-6Al-4V lattices will confirm the safety of custom orthopaedic implants. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Other |