{"id":6562,"date":"2025-01-02T17:48:16","date_gmt":"2025-01-02T16:48:16","guid":{"rendered":"https:\/\/www.mines-stetienne.fr\/lgf\/?p=6562"},"modified":"2025-02-04T17:52:18","modified_gmt":"2025-02-04T16:52:18","slug":"soutenance-de-these-maxime-lematais-13-janvier-2025","status":"publish","type":"post","link":"https:\/\/www.mines-stetienne.fr\/lgf\/soutenance-de-these-maxime-lematais-13-janvier-2025\/","title":{"rendered":"Soutenance de th\u00e8se &#8211; Maxime Lematais &#8211; 13 janvier 2025"},"content":{"rendered":"\n<p>La soutenance de th\u00e8se de Maxime Lematais lieu le lundi 13 Janvier 2025 \u00e0 9h55 dans l\u2019amphith\u00e9\u00e2tre F2 de l&#8217;\u00c9cole des Mines de Saint-\u00c9tienne.<\/p>\n\n\n\n<p>Il sera \u00e9galement possible d&#8217;assister en ligne \u00e0 celle-ci via <a href=\"https:\/\/us02web.zoom.us\/j\/84378532110\">Zoom<\/a>.<\/p>\n\n\n\n<p>Le travail sera pr\u00e9sent\u00e9 devant un jury compos\u00e9 de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cazottes Sophie, Ma\u00eetre de conf\u00e9rence HDR, INSA Lyon, rapporteure<\/li>\n\n\n\n<li>Vrel Dominique, Directeur de recherche CNRS, Institut Galil\u00e9e, Rapporteur<\/li>\n\n\n\n<li>Barthe Marie-France, Directrice de recherche CNRS, Universit\u00e9 d&#8217;Orl\u00e9ans, Examinatrice<\/li>\n\n\n\n<li>Hirai Takeshi, Docteur, ITER, Examinateur<\/li>\n\n\n\n<li>Kermouche Guillaume , Professeur, Mines Saint-\u00c9tienne, Directeur de th\u00e8se<\/li>\n\n\n\n<li>Gallais Laurent, Professeur, Institut Fresnel, Co-directeur de th\u00e8se<\/li>\n\n\n\n<li>Marianne Richou, Docteur, CEA, Encadrante<\/li>\n\n\n\n<li>Claire Maurice, Charg\u00e9e de recherche CNRS, Mines Saint-\u00c9tienne, Encadrante<\/li>\n<\/ul>\n\n\n\n<p>La soutenance sera suivie par le traditionnel pot de th\u00e8se auquel les participants sont cordialement convi\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sum\u00e9<\/h2>\n\n\n\n<p>La fusion est une r\u00e9action nucl\u00e9aire exothermique envisag\u00e9e pour la production d\u2019\u00e9lectricit\u00e9. Dans les r\u00e9acteurs \u00e0 fusion nucl\u00e9aire, le combustible est chauff\u00e9 autours de 150 millions de degr\u00e9s Celsius pour amorcer la r\u00e9action de fusion. Les particules charg\u00e9es s\u2019\u00e9chappant du plasma de fusion sont transport\u00e9es vers une r\u00e9gion nomm\u00e9 divertor. Dans cette r\u00e9gion, les composants du divertor doivent supporter d\u2019intenses flux ioniques et thermiques. Sur ces composants, le tungst\u00e8ne est le premier mat\u00e9riau expos\u00e9 au plasma. En cons\u00e9quence, celui-ci est soumis \u00e0 des temp\u00e9ratures comprises entre 300 et 3400 \u00b0C. La recristallisation du tungst\u00e8ne est une transformation de la microstructure ayant lieu lorsque celui-ci est soumis \u00e0 des temp\u00e9ratures sup\u00e9rieures \u00e0 1000 \u00b0C. Cette transformation est accompagn\u00e9e d\u2019une modification des propri\u00e9t\u00e9s du tungst\u00e8ne. Cette transformation affecte donc les performances des composants du divertor. Chaque facteur (microstructure initiale, temp\u00e9rature, exposition \u00e0 un plasma) affectant la recristallisation a \u00e9t\u00e9 \u00e9tudi\u00e9 de fa\u00e7on ind\u00e9pendante par divers auteurs. Bien que la recristallisation du tungst\u00e8ne soit un ph\u00e9nom\u00e8ne connu depuis plus de 50 ans, son \u00e9tude dans un environnement de fusion nucl\u00e9aire reste complexe. Pour d\u00e9terminer l\u2019effet coupl\u00e9 de ces facteurs sur la recristallisation, il est n\u00e9cessaire de reproduire par simulations ou par exp\u00e9riences, les conditions attendues en tokamak. Les flux ioniques, neutroniques, et thermiques attendues varient fortement d\u2019un composant \u00e0 l\u2019autre selon sa position dans le divertor. Les temp\u00e9ratures, et conditions d\u2019irradiations r\u00e9sultants de ces flux thermiques fluctuent \u00e9galement fortement \u00e0 l\u2019int\u00e9rieur d\u2019un m\u00eame composant. La diversit\u00e9 de ces conditions coupl\u00e9es \u00e0 la mosa\u00efque de mat\u00e9riaux en tungst\u00e8ne d\u00e9velopp\u00e9s pour les r\u00e9acteurs \u00e0 fusion nucl\u00e9aire r\u00e9sulte en une tr\u00e8s importante quantit\u00e9 de combinaison possibles. L\u2019\u00e9tude coupl\u00e9e des facteurs affectant la recristallisation n\u00e9cessite donc d\u2019effectuer de nombreuses exp\u00e9riences ou simulations num\u00e9riques. L\u2019objectif de cette th\u00e8se est la mise aux points de nouvelles m\u00e9thodes permettant de r\u00e9duire la dur\u00e9e des exp\u00e9riences et simulations permettant d\u2019\u00e9tudier la recristallisation du tungst\u00e8ne \u00e0 haute temp\u00e9rature. Dans cette optique, des m\u00e9thodes d\u2019exp\u00e9rimentation, de caract\u00e9risation et de mod\u00e9lisation ont \u00e9t\u00e9 d\u00e9velopp\u00e9es. Des exp\u00e9riences de traitement thermique \u00e0 haute temp\u00e9rature permettant d\u2019acc\u00e9l\u00e9rer la recristallisation du tungst\u00e8ne ont d\u2019abord \u00e9t\u00e9 d\u00e9velopp\u00e9. Ces exp\u00e9riences permettent de r\u00e9duire de plusieurs ordres de grandeur le temps n\u00e9cessaire pour reproduire les conditions de temp\u00e9ratures responsable de la recristallisation du tungst\u00e8ne lors de transitoires lents. Par la suite, une m\u00e9thodologie permettant d\u2019optimiser le post-traitement des cartes EBSD est propos\u00e9e. Cette m\u00e9thodologie permet de discriminer les grains recristallis\u00e9s des grains non recristallis\u00e9s. Une m\u00e9thode est \u00e9galement propos\u00e9e pour acc\u00e9l\u00e9rer l\u2019estimation de la densit\u00e9 de dislocations dans les grains non recristallis\u00e9s. Ces m\u00e9thodes sont utilis\u00e9es pour \u00e9tudier la recristallisation d\u2019un mat\u00e9riau respectant les sp\u00e9cifications ITER. L\u2019influence d\u2019une pr\u00e9exposition \u00e0 un plasma d\u2019h\u00e9lium, des rampes de temp\u00e9ratures, et du gradient thermique sur la recristallisation de ce mat\u00e9riau est mesur\u00e9e. Enfin, les diff\u00e9rents m\u00e9canismes responsables de la recristallisation sont \u00e9tudi\u00e9s s\u00e9par\u00e9ment \u00e0 partir d\u2019analyses DRX, EBSD et d\u2019essais de duret\u00e9. A partir des r\u00e9sultats de cette \u00e9tude, un mod\u00e8le JMAK est d\u00e9velopp\u00e9 pour permettre de corr\u00e9ler la croissance de grains, la diminution de la densit\u00e9 de dislocations, et l\u2019\u00e9volution de la fraction recristallis\u00e9e. <\/p>\n\n\n\n<p>Mots cl\u00e9s : recristallisation, tungst\u00e8ne, fusion nucl\u00e9aire, proc\u00e9d\u00e9 laser, traitement thermique, EBSD, DRX, duret\u00e9, microstructure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La soutenance de th\u00e8se de Maxime Lematais lieu le lundi 13 Janvier 2025 \u00e0 9h55 dans l\u2019amphith\u00e9\u00e2tre F2 de l&#8217;\u00c9cole des Mines de Saint-\u00c9tienne. Il sera \u00e9galement possible d&#8217;assister en ligne \u00e0 celle-ci via Zoom. Le travail sera pr\u00e9sent\u00e9 devant un jury compos\u00e9 de : La soutenance sera suivie par le traditionnel pot de th\u00e8se&hellip;<\/p>\n","protected":false},"author":1474,"featured_media":6563,"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":"6213,6514,6378,6394,5954,6530","_relevanssi_noindex_reason":"","footnotes":""},"categories":[21],"tags":[35],"post_series":[],"class_list":["post-6562","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 v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Soutenance de th\u00e8se - Maxime Lematais - 13 janvier 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-maxime-lematais-13-janvier-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 - Maxime Lematais - 13 janvier 2025 - Laboratoire Georges Friedel\" \/>\n<meta property=\"og:description\" content=\"La soutenance de th\u00e8se de Maxime Lematais lieu le lundi 13 Janvier 2025 \u00e0 9h55 dans l\u2019amphith\u00e9\u00e2tre F2 de l&#8217;\u00c9cole des Mines de Saint-\u00c9tienne. 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