{"id":6713,"date":"2025-11-26T11:14:49","date_gmt":"2025-11-26T10:14:49","guid":{"rendered":"https:\/\/www.mines-stetienne.fr\/lgf\/?p=6713"},"modified":"2026-02-06T11:26:52","modified_gmt":"2026-02-06T10:26:52","slug":"soutenance-de-these-sarah-alzein-03-decembre-2025","status":"publish","type":"post","link":"https:\/\/www.mines-stetienne.fr\/lgf\/soutenance-de-these-sarah-alzein-03-decembre-2025\/","title":{"rendered":"Soutenance de th\u00e8se &#8211; Sarah Alzein &#8211; 03 d\u00e9cembre 2025"},"content":{"rendered":"\n<p>La soutenance de th\u00e8se de Sarah Alzein aura lieu le mercredi 03 d\u00e9cembre 2025 \u00e0 10h dans l\u2019amphith\u00e9\u00e2tre F2 de l\u2019\u00c9cole des Mines de Saint-\u00c9tienne.<\/p>\n\n\n\n<p>La th\u00e8se sera pr\u00e9sent\u00e9e devant un jury compos\u00e9 de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Jacques BESSON<\/strong>, Directeur de recherche, Mines Paris, CNRS, Examinateur<\/li>\n\n\n\n<li><strong>Jamaa BOUHATTATE<\/strong>, \u00a0Ma\u00eetresse de conf\u00e9rences, Universit\u00e9 de La Rochelle, Examinatrice<\/li>\n\n\n\n<li><strong>Emilio MARTINEZ-PA\u00d1EDA<\/strong>, Professeur associ\u00e9, University of Oxford, Rapporteur<\/li>\n\n\n\n<li><strong>Marc TUPIN<\/strong>, Directeur de recherche, CEA Saclay, Rapporteur<\/li>\n\n\n\n<li><strong>Frederic CHRISTIEN<\/strong>, Professeur, Mines Saint-\u00c9tienne, Directeur de th\u00e8se<\/li>\n\n\n\n<li><strong>Alixe DREANO<\/strong>, Ma\u00eetresse assistante, Mines Saint-\u00c9tienne, Co-encadrante<\/li>\n\n\n\n<li><strong>Vincent BARNIER<\/strong>, Ing\u00e9nieur de recherches, Mines Saint-\u00c9tienne, CNRS, Invit\u00e9<\/li>\n<\/ul>\n\n\n\n<p>La soutenance sera suivie d\u2019un pot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sum\u00e9<\/h2>\n\n\n\n<p>La fragilisation par l\u2019hydrog\u00e8ne constitue un enjeu majeur pour la fiabilit\u00e9 des mat\u00e9riaux m\u00e9talliques utilis\u00e9s dans les infrastructures de l\u2019hydrog\u00e8ne. Si de nombreux travaux se sont concentr\u00e9s sur les d\u00e9fauts internes (dislocations, lacunes, joints de grains), les effets li\u00e9s aux porosit\u00e9s, \u00e0 la rugosit\u00e9 de surface et aux couches d\u2019oxydes demeurent peu explor\u00e9s. Cette th\u00e8se vise \u00e0 combler cette lacune en \u00e9tudiant l\u2019influence de ces caract\u00e9ristiques souvent n\u00e9glig\u00e9es sur l\u2019absorption, la diffusion et le pi\u00e9geage de l\u2019hydrog\u00e8ne dans le fer pur et les alliages Fe\u2013Cr.<\/p>\n\n\n\n<p>Pour ce faire, une approche exp\u00e9rimentale et num\u00e9rique int\u00e9gr\u00e9e a \u00e9t\u00e9 d\u00e9velopp\u00e9e, combinant des techniques de perm\u00e9ation \u00e9lectrochimique (EP), de spectroscopie de d\u00e9sorption thermique (TDS), de microscopie (MEB, AFM, FIB, EBSD, TKD) et d\u2019analyse de surface (XPS, AR-XPS), appuy\u00e9es par des mod\u00e8les thermodynamiques hors \u00e9quilibre.<\/p>\n\n\n\n<p>Les r\u00e9sultats montrent que : (i) les microporosit\u00e9s agissent comme des pi\u00e8ges r\u00e9versibles responsables d\u2019un comportement atypique de diffusion (\u00ab double mont\u00e9e \u00bb dans les courbes de perm\u00e9ation) ; (ii) la rugosit\u00e9 de surface limite l\u2019entr\u00e9e d\u2019hydrog\u00e8ne gr\u00e2ce \u00e0 une recombinaison accrue, mais favorise sa r\u00e9tention par les d\u00e9fauts de sous-surface induits m\u00e9caniquement ; (iii) les couches d\u2019oxydes \u00e9voluent sous l\u2019effet de l\u2019hydrog\u00e8ne, l\u2019oxyde de fer se r\u00e9duisant s\u00e9lectivement tandis que l\u2019oxyde de chrome stabilise la couche passive.<\/p>\n\n\n\n<p>Ces r\u00e9sultats apportent une compr\u00e9hension \u00e9largie des m\u00e9canismes de fragilisation en int\u00e9grant les contributions de surface et de volume. Ils ouvrent des perspectives pour la conception de mat\u00e9riaux plus r\u00e9sistants aux environnements hydrog\u00e9n\u00e9s et pour le d\u00e9veloppement de strat\u00e9gies de protection adapt\u00e9es aux infrastructures de l\u2019\u00e9conomie de l\u2019hydrog\u00e8ne.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mots-cl\u00e9s<\/h2>\n\n\n\n<p>Hydrog\u00e8ne ; diffusion et pi\u00e9geage ; porosit\u00e9 ; rugosit\u00e9 ; oxyde<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La soutenance de th\u00e8se de Sarah Alzein aura lieu le mercredi 03 d\u00e9cembre 2025 \u00e0 10h dans l\u2019amphith\u00e9\u00e2tre F2 de l\u2019\u00c9cole des Mines de Saint-\u00c9tienne. La th\u00e8se sera pr\u00e9sent\u00e9e devant un jury compos\u00e9 de : La soutenance sera suivie d\u2019un pot. R\u00e9sum\u00e9 La fragilisation par l\u2019hydrog\u00e8ne constitue un enjeu majeur pour la fiabilit\u00e9 des mat\u00e9riaux&hellip;<\/p>\n","protected":false},"author":1474,"featured_media":6714,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"6498,6112,6521,6419,6707,6590","_relevanssi_noindex_reason":"","footnotes":""},"categories":[21],"tags":[35],"post_series":[],"class_list":["post-6713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-slide-home","entry","has-media"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","pp_force_visibility":null,"pp_subpost_visibility":null,"pp_inherited_force_visibility":null,"pp_inherited_subpost_visibility":null,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Soutenance de th\u00e8se - Sarah Alzein - 03 d\u00e9cembre 2025 - Laboratoire Georges Friedel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mines-stetienne.fr\/lgf\/soutenance-de-these-sarah-alzein-03-decembre-2025\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soutenance de th\u00e8se - Sarah Alzein - 03 d\u00e9cembre 2025 - Laboratoire Georges Friedel\" \/>\n<meta property=\"og:description\" content=\"La soutenance de th\u00e8se de Sarah Alzein aura lieu le mercredi 03 d\u00e9cembre 2025 \u00e0 10h dans l\u2019amphith\u00e9\u00e2tre F2 de l\u2019\u00c9cole des Mines de Saint-\u00c9tienne. La th\u00e8se sera pr\u00e9sent\u00e9e devant un jury compos\u00e9 de : La soutenance sera suivie d\u2019un pot. R\u00e9sum\u00e9 La fragilisation par l\u2019hydrog\u00e8ne constitue un enjeu majeur pour la fiabilit\u00e9 des mat\u00e9riaux&hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mines-stetienne.fr\/lgf\/soutenance-de-these-sarah-alzein-03-decembre-2025\/\" \/>\n<meta property=\"og:site_name\" content=\"Laboratoire Georges Friedel\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-26T10:14:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-06T10:26:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mines-stetienne.fr\/lgf\/wp-content\/uploads\/sites\/6\/2026\/02\/alzein.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1050\" \/>\n\t<meta property=\"og:image:height\" content=\"700\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"QUEY Romain\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"QUEY Romain\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/\"},\"author\":{\"name\":\"QUEY Romain\",\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/#\\\/schema\\\/person\\\/b97a2c3735850c7efa17225a337dbca0\"},\"headline\":\"Soutenance de th\u00e8se &#8211; Sarah Alzein &#8211; 03 d\u00e9cembre 2025\",\"datePublished\":\"2025-11-26T10:14:49+00:00\",\"dateModified\":\"2026-02-06T10:26:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/\"},\"wordCount\":457,\"publisher\":{\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2026\\\/02\\\/alzein.png\",\"keywords\":[\"slide-home\"],\"articleSection\":[\"News\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/\",\"url\":\"https:\\\/\\\/www.mines-stetienne.fr\\\/lgf\\\/soutenance-de-these-sarah-alzein-03-decembre-2025\\\/\",\"name\":\"Soutenance de th\u00e8se - 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