About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Environmental Degradation of Multiple Principal Component Materials
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Presentation Title |
Effect of Niobium Addition on the Passivity and Corrosion Resistance of TiHfZrNbx High-entropy Alloys in a Hanks’ Solution |
Author(s) |
Ayoub Tanji, Xuesong Fan, Ridwan Sakidja, Peter K Liaw, Hendra Hermawan |
On-Site Speaker (Planned) |
Ayoub Tanji |
Abstract Scope |
TiHfZrNbx is particularly made up of very passivating elements with very good biocompatibility, which can be interesting for permanent-stent material. This study showed that the TiHfZrNbx have a more corrosion-resistant character than the CP-Ti and Ti6Al4V. The corrosion resistance increases by increasing the Nb content, with a better repassivation behavior. A non-diffusional corrosion character was observed for the HEAs, with charge transfer and oxide film resistances greater than those of CP-Ti and Ti6Al4V, and they increase with increasing %Nb. The passive-film formed on HEAs specimens present an n-type semiconducting character composed mainly of TiO2, Nb2O5, ZrO2, and HfO2 oxides, with a decrease in donor densities with increasing the %Nb. The addition of 0.4% Nb (molar ratio) improved the corrosion resistance and surface characteristics of TiHfZrNbx by enhancing the passivity, associated with the decrease in the film defects and vacancies, as well as the charge transfer resistance of the oxide film. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Biomaterials, Environmental Effects |