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In situ observation of liquid metal dealloying and etching of porous FeCr by X-ray tomography and X-ray diffraction

Abstract : A liquid metal dealloying mechanism is investigated in situ using X-ray tomography and X-ray diffraction. While immersing a FeCrNi precursor alloy in a molten Mg bath, a selective dissolution of Ni atoms into the Mg bath occurs leading to FeCr atom rearrangement. At room temperature, after cooling down, a bicontinuous structure of FeCr and a solid solution of Ni in Mg is obtained. A final etching step is used to remove the Mg solid-state solution phase and form microporous FeCr. 3D dealloying and etching kinetics can be measured using X-ray tomography reconstruction. The evolution of relative strain is analyzed from X-ray diffraction patterns. The different behavior observed during dealloying and etching, depending on the precursor composition is discussed.
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https://hal.archives-ouvertes.fr/hal-03240497
Contributor : Christophe Le Bourlot <>
Submitted on : Friday, May 28, 2021 - 10:09:30 AM
Last modification on : Friday, June 11, 2021 - 1:00:04 PM

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Morgane Mokhtari, Christophe Le Bourlot, Jérome Adrien, Anne Bonnin, Wolfgang Ludwig, et al.. In situ observation of liquid metal dealloying and etching of porous FeCr by X-ray tomography and X-ray diffraction. Materialia, Elsevier, inPress, ⟨10.1016/j.mtla.2021.101125⟩. ⟨hal-03240497⟩

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