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Solute clustering in multi-component aluminium alloys

Abstract : Decomposition of super saturated solid solutions of Al-Cu-(Li,Mg) alloys pose theoretical and experimental challenges. The chemical fluctuations - clusters - formed at room temperature are critically analysed using a combination of in-situ small angle scattering (SAS), differential scanning calorimetry (DSC), atom probe tomography (APT), and micro-hardness. A methodology for combined interpretation of SAS data from experiments using neutron and X-ray radiation is proposed and allows for comparison with standard analysis performed by APT. The results effectively capture the chemistry and sub-nanometer dimensions of clusters. The profound positive effect of Mg on clustering of Cu via excess vacancies available for diffusion is captured through the clustering kinetics over the course of natural ageing. Short isothermal treatments at relatively low temperatures are used to dissolve naturally aged clusters and obtain a solid solution with less expected vacancies. When Mg is present in the Al-Cu-Li system, released solute after dissolution exhibits clustering behaviour with kinetics comparable to those immediately after quench from solution treatment. The immediate increase of clustering kinetics when any concentration of Mg is present in Al-Cu-(Li,Mg) alloys is revealed through a composition graded sample.
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https://tel.archives-ouvertes.fr/tel-01688296
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Submitted on : Friday, January 19, 2018 - 12:05:10 PM
Last modification on : Thursday, November 19, 2020 - 1:01:49 PM
Long-term archiving on: : Thursday, May 24, 2018 - 6:49:30 AM

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  • HAL Id : tel-01688296, version 1

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Rosen Ivanov. Solute clustering in multi-component aluminium alloys. Materials. Université Grenoble Alpes, 2017. English. ⟨NNT : 2017GREAI012⟩. ⟨tel-01688296⟩

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