Experimental and thermodynamic modeling of Al 2 O 3 corundum and TiO 2 rutile structures forming on Ti-6Al-4V powder during oxidation
In: ISSN: 1359-6454 ; Acta Materialia ; https://hal-emse.ccsd.cnrs.fr/emse-04439150 ; Acta Materialia, 2023, 256, pp.119037. ⟨10.1016/j.actamat.2023.119037⟩ ; https://www.sciencedirect.com/science/article/pii/S1359645423003683?via%3Dihub, 2023
academicJournal
Zugriff:
International audience ; The high affinity of Ti-6Al-4 V (Ti64) powder to oxygen impacts the quality of the powder during additive manufacturing. The oxide scale consists of a double layer with α-Al 2 O 3 in the outer part and TiO 2 in the inner one. Experimental and thermodynamic results are used to further understand the formation of these two oxide layers. Inert marker revealed the anionic growth of the duplex oxide scale. The thermodynamic results highlighted that interstitial aluminum enters and diffuses fast within TiO 2 (rutile) to form Al 2 O 3 as the surface layer. Moreover, α-Al 2 O 3 is considered as a non-stoichiometric oxide with a very small excess of oxygen as dumbbells at high partial pressures of oxygen. A remarkable effect of the impurities on the concentration of native point defects is observed in this phase. Finally, a reactional mechanism with elementary steps for the oxidation of Ti64 powder is proposed.
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Experimental and thermodynamic modeling of Al 2 O 3 corundum and TiO 2 rutile structures forming on Ti-6Al-4V powder during oxidation
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| Autor/in / Beteiligte Person: | Siblani, Mohamad Mahdi ; Ollivier, Maelig ; Favergeon, Loïc ; Chartrand, P. ; Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT) ; Laboratoire Georges Friedel (LGF-ENSMSE) ; Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) ; Centre for Research in Computational Thermochemistry ; École Polytechnique de Montréal (EPM) ; Department of Chemical Engineering ; Polytechnique Montreal, Department of Chemical Engineering, Centre for Research in Computational Thermochemistry (CRCT) |
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| Zeitschrift: | ISSN: 1359-6454 ; Acta Materialia ; https://hal-emse.ccsd.cnrs.fr/emse-04439150 ; Acta Materialia, 2023, 256, pp.119037. ⟨10.1016/j.actamat.2023.119037⟩ ; https://www.sciencedirect.com/science/article/pii/S1359645423003683?via%3Dihub, 2023 |
| Veröffentlichung: | HAL CCSD ; Elsevier, 2023 |
| Medientyp: | academicJournal |
| DOI: | 10.1016/j.actamat.2023.119037 |
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