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Propriétés d’absorption de l’hydrogène sur un titane commercial pur Ti50A ayant subi du laminage à froid

Abstract : The constant use of hydrocarbons, carbon dioxide emissions and global warming are the subject of a global energy debate. Establishing a hydrogen economy is considered as an effective alternative solution. Various technological problems have to be solved to achieve such a global energy system such as hydrogen production, delivery and storage. Various methods of storing hydrogen are available. Among these, storage in the form of metal hydrides represents a promising and practical means. In this context, mechanical deformation techniques applied to hydrogen storage materials have seen increased use these recent years. These techniques enable the improvement of the hydrogen storage performance of various types of metal hydrides. The present work focuses on the effect of mechanical deformation induced by the cold rolling technique on the hydrogen absorption properties of the commercial pure titanium Ti50A. To do this, two main processing parameters were varied and studied during cold rolling, namely the reduction rate and the rolling speed. First, an analysis and an understanding of the deformation microstructures induced by the cold rolling technique on pure titanium before hydrogenation was carried out for the different mechanical processing conditions. Then, the study of the effect of cold rolling on the first hydrogen absorption of titanium was carried out. The hydrogenated samples were also examined and the titanium hydride formed after complete hydrogenation was characterized. The obtained results showed a significant improvement in the kinetics of the first hydrogen absorption for the cold-rolled samples compared to the unrolled pure titanium sample. The parametric study performed on titanium Ti50A showed that the cold rolling processing parameters greatly affect the kinetics of the first hydrogenation while maintaining the maximum hydrogen absorption capacity. The increase in the reduction rate during cold rolling allows the improvement of the hydrogenation kinetics, associated with an activation of the twinning deformation for low reduction rates and a decrease in the size of the titanium grains after rolling. On the other hand, it has been shown that a low rolling speed ensures better kinetics of hydrogen absorption, while exhibiting microstructures characterized by a large fraction of low angle boundaries. Finally, the mechanism of hydrogen absorption by titanium was investigated through the determination of the rate limiting-step of the absorption reaction. It was revealed that all rolled samples under the different conditions follow the absorption mechanism governed by the contracting volume model. In addition, a sample of rolled titanium was selected for detailed study of the phase transformation of titanium to titanium hydride following complete uptake of hydrogen by Ti50A. This study was performed by analyzing and examining partially hydrogenated samples.
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https://hal.univ-lorraine.fr/tel-03354061
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Submitted on : Friday, September 24, 2021 - 3:44:26 PM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM

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  • HAL Id : tel-03354061, version 1

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Sabrine Boulila. Propriétés d’absorption de l’hydrogène sur un titane commercial pur Ti50A ayant subi du laminage à froid. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine; Université du Québec à Trois-Rivières, 2021. Français. ⟨NNT : 2021LORR0066⟩. ⟨tel-03354061⟩

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