bei Google ScholarTitelangaben
Dickes, Daniel ; Zhao, Yujun ; Baier, Felix ; Öztürk, Beyza ; Völkl, Rainer ; Li, Tong ; Galetz, Mathias C. ; Glatzel, Uwe:
Influence of oxygen ingress on microstructure and phase formation during two-step oxidation surface hardening of TiZrNbHfTa high entropy alloy.
In: Applied Physics Letters.
Bd. 124
(2024)
Heft 7
.
- 071903.
ISSN 1077-3118
DOI: https://doi.org/10.1063/5.0190771
Abstract
Aiming for an increased surface hardness and a better wear resistance of TiZrNbHfTa, we investigate a two-step process combining oxidation of rolled, ultrafine-grained, single-phase bcc TiZrNbHfTa in air at 550 °C with a vacuum heat treatment process at 1200 °C, including subsequent quenching. The first process step is associated with the formation of a surface oxide layer, a phase decomposition of the bulk, and oxygen ingress into the bulk, leading to an oxygen-enriched subsurface region containing internal oxides. The second process step is capable of restoring the single-phase nature of the bulk TiZrNbHfTa. At the same time, the presence of a compact surface oxide layer of 1–2 μm and an oxygen-enriched subsurface region underneath is preserved. The oxygen present in the subsurface region stabilizes a two-phase regime consisting of a Hf- and Zr-rich hcp phase and an Nb- and Ta-rich bcc phase, with the oxygen being interstitially dissolved predominantly in the hcp phase.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | crystal structure; alloys; hardness; mechanical properties; surface hardening; oxidation process; X-ray diffraction; X-ray photoelectron spectroscopy |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Metallische Werkstoffe > Lehrstuhl Metallische Werkstoffe - Univ.-Prof. Dr.-Ing. Uwe Glatzel Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Materialzentrum - BayMAT |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 15 Apr 2024 13:05 |
| Letzte Änderung: | 15 Apr 2024 13:05 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/89300 |