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Article Dans Une Revue Corrosion Science Année : 2023

Surface hardening of TiZrNbHfTa high entropy alloy via oxidation

Résumé

We investigate the oxidation of TiZrNbHfTa high entropy alloy between 550 °C and 650 °C as a surface hardening method. Coarse-grained specimens with grain boundaries perpendicular to the surface exhibit catastrophic oxidation, while ultrafine-grained, cold-rolled specimens show a continuous mass gain and the formation of an adherent, µm-sized, vitreous oxide layer. Underneath, TiZrNbHfTa decomposes into a bcc-and an hcp-phase, while selective internal oxidation of hafnium and zirconium occurs upon oxygen inward diffusion. Oxygen concentration-and microhardness-depth profiles confirm an increase in oxygen concentration and hardness at the surface, raising the initial hardness by four times to 1522±64 HV 0.5.

Domaines

Matériaux
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Dates et versions

hal-04287944 , version 1 (15-11-2023)

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Daniel Dickes, Beyza Öztürk, Felix Baier, Easo P George, Rainer Völkl, et al.. Surface hardening of TiZrNbHfTa high entropy alloy via oxidation. Corrosion Science, 2023, 217, pp.111159. ⟨10.1016/j.corsci.2023.111159⟩. ⟨hal-04287944⟩
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