Tong Li
Professor for Atomic-scale Characterisation
Research Interests
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Positions (4)
Articles (9)
Influence of oxygen ingress on microstructure and phase formation during two-step oxidation surface hardening of TiZrNbHfTa high entropy alloy
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.
Year:
2024
Year:
2021
Collaborators (7)
Uwe Glatzel
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Mathias Galetz
Head
DECHEMA Forschungsinstitut
Prof. Oana Cojocaru-Miredin
Chair Professor for "Cross-scale Material Characterization"
Albert-Ludwigs-Universität Freiburg Universitätsbibliothek Freiburg
Daniel Dickes
Max Planck Institute for Plasma Physics
Michael Moody
University of Oxford
Carl Boehlert
Professor
Michigan State University
Dongshuang Wu
Assistant Professor
Nanyang Technological University (NTU)

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