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Article Dans Une Revue Intermetallics Année : 2024

Oxygen diffusion coefficient in the γ phase of a TiAl GE alloy determined by SIMS

Résumé

First reliable experimental oxygen diffusion coefficient data have been obtained in a Ti$_{48.3}$Al$_{47.7}$Cr$_{1.9}$Nb$_{2.1}$ near-γ GE alloy through secondary ion mass spectrometry (SIMS) depth profiling measurements of $^{18}$O isotopes between 500°C and 700°C. The following expression of diffusion coefficient D has thus been derived: D(m$^2$/s) =10$^{-10.6±1}$∙ exp(−107±10 kJ.mol$^{−1}$/RT). These data have been compared with theoretical calculations from literature, showing reasonable agreement concerning the activation energy, but significant discrepancy regarding the D values.
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Dates et versions

hal-04620166 , version 1 (21-06-2024)

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Camille Thenot, Daniel Monceau, Damien Connétable, Pierre Sallot, Marie-Amandine Pinault-Thaury, et al.. Oxygen diffusion coefficient in the γ phase of a TiAl GE alloy determined by SIMS. Intermetallics, 2024, 172, pp.108367. ⟨10.1016/J.INTERMET.2024.108367⟩. ⟨hal-04620166⟩
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