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Journal Articles Scripta Materialia Year : 2024

Effect of creep loading on the oxygen diffusion of Ti6242S at 650°C

Abstract

The influence of low and steady loading on the oxidation behaviour and oxygen diffusion within Ti6242S was investigated at 650 °C in air. Electron probe microanalyser (EPMA), secondary-ion mass spectrometry (SIMS) and high energy synchrotron X-ray diffraction (S-XRD) were used to quantify the oxygen distribution within the oxygen-enriched layer beneath the external oxide scale. Rietveld and peak by peak methods were used to evaluate the average response versus the crystal-oriented response of this diffusion process under load. Interestingly, a thermo-mechano-chemical coupling occurs during the creep-oxidation experiment even for moderate applied stresses (25-70 MPa) and demonstrates: (i) a decrease of the oxygen concentration at the metal/oxide interface, and (ii) a curvature change of the oxygen diffusion profile with load application. A qualitative thermo-mechano-chemical approach is proposed to model the modification of the diffusion law of the oxygen within Ti6242S due to application of a mechanical loading to explain observed experimental results.
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Monday, March 4, 2024
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Dates and versions

hal-04204533 , version 1 (13-09-2023)

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K. Cavé, D. Texier, S. Vallot, N. Chanfreau, E. Fessler, et al.. Effect of creep loading on the oxygen diffusion of Ti6242S at 650°C. Scripta Materialia, 2024, 238, pp.115748. ⟨10.1016/j.scriptamat.2023.115748⟩. ⟨hal-04204533⟩
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