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Influence of oxygen ingress on microstructure and phase formation during two-step oxidation surface hardening of TiZrNbHfTa high entropy alloy

Title data

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. Vol. 124 (2024) Issue 7 . - 071903.
ISSN 1077-3118
DOI: https://doi.org/10.1063/5.0190771

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: crystal structure; alloys; hardness; mechanical properties; surface hardening; oxidation process; X-ray diffraction; X-ray photoelectron spectroscopy
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Metals and Alloys > Chair Metals and Alloys - Univ.-Prof. Dr.-Ing. Uwe Glatzel
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 15 Apr 2024 13:05
Last Modified: 15 Apr 2024 13:05
URI: https://eref.uni-bayreuth.de/id/eprint/89300