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Experimental Study and Modelling of Mechanical Features in an Oxide Layer under Thermal Loadings

Abstract : The quality of protective oxide scales developing at the metallic alloys surface at high temperature depends on the stress generation and relaxation mechanisms. In this work, a model and a related identification tool have been developed in order to investigate the stress evolution in the metal/oxide systems under thermal cycling loadings, along with the identification of mechanism and materials properties. The model is applied using the experimental data providing from literature for the system NiAl/Al2O3. The value of activation energy is compared with that in the publications, in order to valid our method. In situ high temperature oxidation coupled with Synchrotron X-rays diffraction was used to measure the stress evolution of chromia scales grown on Ni30Cr and Ni28Cr, with dissociating the effects related to thermal activation and grain size. Confrontation of the obtained activation energy (around 1.4ev) with literature results has shown that the creep was likely governed by grain boundary transport of oxygen species. When the reactive element Y2O3 was added to the metallic substrate Ni28Cr, a linear change of the activation energy was noted when increasing the amount of introduced element. As far as we know, this is the first time that a linear influence is found
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https://tel.archives-ouvertes.fr/tel-02972217
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Submitted on : Tuesday, October 20, 2020 - 11:30:10 AM
Last modification on : Wednesday, October 21, 2020 - 3:31:23 AM

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Zhaojun_Tao_2018TROY0003.pdf
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  • HAL Id : tel-02972217, version 1

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Zhaojun Tao. Experimental Study and Modelling of Mechanical Features in an Oxide Layer under Thermal Loadings. Materials and structures in mechanics [physics.class-ph]. Université de Technologie de Troyes, 2018. English. ⟨NNT : 2018TROY0003⟩. ⟨tel-02972217⟩

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