| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Biomaterials for Biomedical Implants
|
| Presentation Title |
Developing Strong and Ductile TWIP Zr-based Alloys for Cardiovascular Stent Application |
| Author(s) |
Junhui Tang, Philippe Vermaut, Frédéric Prima, Fan Sun |
| On-Site Speaker (Planned) |
Junhui Tang |
| Abstract Scope |
Good combination of strength and ductility, superior biocompatibilities and sufficient radio-opacity are desirable properties for materials to make cardiovascular stents. Zirconium is interesting for stent application due to its good corrosion resistance, low magnetic susceptibility and superior biocompatibility. However, pure Zr and conventional Zr alloys are not suitable for thin-strut stent design due to their limited strength or ductility. In the present work, new beta-metastable Zr alloys are developed to combine high strength and good ductility. Among the studied alloys, the ones exhibiting Twinning Induced Plasticity (TWIP) effect show important improvements of strength, strain-hardening rate and uniform elongation. Metallographical investigations, including in-situ electron backscattered diffraction (EBSD) mapping and transmission electron microscopy (TEM) observations under tensile load, are conducted to clarify the deformation mechanisms. Corrosion susceptibility assessment, biocompatibility characterization and stent prototyping are planned to evaluate the new TWIP Zr alloys for stent application. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Biomaterials, Characterization, Mechanical Properties |