{"id":4970,"date":"2022-03-04T17:36:35","date_gmt":"2022-03-04T16:36:35","guid":{"rendered":"https:\/\/mindev.mines-stetienne.fr\/lgf\/?page_id=4970"},"modified":"2022-09-07T14:24:31","modified_gmt":"2022-09-07T12:24:31","slug":"axe-alliages-a-haute-entropie","status":"publish","type":"page","link":"https:\/\/www.mines-stetienne.fr\/lgf\/equipes-2\/pmm\/axe-alliages-a-haute-entropie\/","title":{"rendered":"Axe Alliages \u00e0 Haute Entropie"},"content":{"rendered":"<div class=\"wpb-content-wrapper\">[vc_row][vc_column][vc_column_text]Ce concept repose sur une approche thermodynamique pr\u00e9voyant que certains m\u00e9langes d\u2019au moins 5 \u00e9l\u00e9ments en (presque) \u00e9qui-proportions, peuvent former une solution solide stable (gr\u00e2ce \u00e0 la forte entropie du m\u00e9lange) malgr\u00e9 la pr\u00e9sence de plusieurs \u00e9l\u00e9ments chimiques en leur sein. L\u2019objectif de nos travaux , outre les aspects acad\u00e9miques reli\u00e9s \u00e0 l\u2019optimisation microstructurale et la compr\u00e9hension des m\u00e9canismes de d\u00e9formation plastique, consiste en la conception et l\u2019\u00e9valuation des \u00ab inox ou superalliages de nouvelle g\u00e9n\u00e9ration \u00bb. Cet axe donne lieu \u00e0 plusieurs actions&nbsp;:<\/p>\n\n<p><strong>L\u2019optimisation de la nuance A3S (\u00ab austenitic superstainless steel \u00bb).<\/strong> Nous \u00e9tudions comment l\u2019\u00e9cart \u00e0 la st\u0153chiom\u00e9trie \u00e9tablie par Cantor stabilise la solution solide \u00e0 des temp\u00e9ratures interm\u00e9diaires et permet de cr\u00e9er des nanostructures stables en conditions de traitement thermom\u00e9canique classique.<\/p>\n\n<p><strong>La conception de nuances HEA sans cobalt.<\/strong> Outre le gain \u00e9conomique associ\u00e9, l\u2019absence de Cobalt permet d\u2019\u00e9largir le domaine d\u2019application, notamment vis-\u00e0-vis du secteur du nucl\u00e9aire. <strong>L\u2019\u00e9valuation de la validit\u00e9 des bases de donn\u00e9es existantes pour le design d\u2019alliage HEA.<\/strong> Si \u00e0 haute temp\u00e9rature de bons accords ont pu \u00eatre obtenu entre les pr\u00e9dictions et les r\u00e9sultats exp\u00e9rimentaux (temp\u00e9ratures de fusion, stabilit\u00e9 de phases, s\u00e9gr\u00e9gation primaire, \u2026), les transformations \u00e0 l\u2019\u00e9tat solide restent encore d\u00e9crites de mani\u00e8re insatisfaisante.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mines-stetienne.fr\/lgf\/wp-content\/uploads\/sites\/6\/2022\/03\/pmm_08.png\" alt=\"\" class=\"wp-image-5100\" width=\"735\" height=\"492\" srcset=\"https:\/\/www.mines-stetienne.fr\/lgf\/wp-content\/uploads\/sites\/6\/2022\/03\/pmm_08.png 980w, https:\/\/www.mines-stetienne.fr\/lgf\/wp-content\/uploads\/sites\/6\/2022\/03\/pmm_08-300x201.png 300w, https:\/\/www.mines-stetienne.fr\/lgf\/wp-content\/uploads\/sites\/6\/2022\/03\/pmm_08-768x514.png 768w\" sizes=\"auto, (max-width: 735px) 100vw, 735px\" \/><\/p>\n<figcaption>Courbes contraintes d\u00e9formations de la nuance A3S selon la dur\u00e9e de recuit. Image MET de la nanostructure apr\u00e8s forgeage.<\/figcaption>\n<\/figure>\n<\/div>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]\n<h3>Autres axes<\/h3>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<nav class=\"vcex-navbar vcex-module\"><div class=\"vcex-navbar-inner wpex-clr wpex-last-mr-0\"><a href=\"https:\/\/www.mines-stetienne.fr\/lgf\/equipes-2\/pmm\/axe-deformation-microstructures\/\" class=\"vcex-navbar-link vcex-navbar-link--4958 wpex-block wpex-float-left wpex-mr-5 wpex-mb-5 theme-button minimal-border\"><span class=\"vcex-navbar-link-text\">Axe D\u00e9formation &amp; Microstructures<\/span><\/a><a href=\"https:\/\/www.mines-stetienne.fr\/lgf\/equipes-2\/pmm\/axe-materiaux-mecanique-surfaces\/\" class=\"vcex-navbar-link vcex-navbar-link--4966 wpex-block wpex-float-left wpex-mr-5 wpex-mb-5 theme-button minimal-border\"><span class=\"vcex-navbar-link-text\">Axe Mat\u00e9riaux, M\u00e9canique &amp; Surfaces<\/span><\/a><a href=\"https:\/\/www.mines-stetienne.fr\/lgf\/equipes-2\/pmm\/axe-fabrication-additive-metallique\/\" class=\"vcex-navbar-link vcex-navbar-link--4968 wpex-block wpex-float-left wpex-mr-5 wpex-mb-5 theme-button minimal-border\"><span class=\"vcex-navbar-link-text\">Axe Fabrication Additive M\u00e9tallique<\/span><\/a><a href=\"https:\/\/www.mines-stetienne.fr\/lgf\/equipes-2\/pmm\/axe-alliages-a-haute-entropie\/\" class=\"vcex-navbar-link vcex-navbar-link--4970 wpex-block wpex-float-left wpex-mr-5 wpex-mb-5 theme-button minimal-border\"><span class=\"vcex-navbar-link-text\">Axe Alliages \u00e0 Haute Entropie<\/span><\/a><\/div><\/nav>[\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text]Ce concept repose sur une approche thermodynamique pr\u00e9voyant que certains m\u00e9langes d\u2019au moins 5 \u00e9l\u00e9ments en (presque) \u00e9qui-proportions, peuvent former une solution solide stable (gr\u00e2ce \u00e0 la forte entropie du m\u00e9lange) malgr\u00e9 la pr\u00e9sence de plusieurs \u00e9l\u00e9ments chimiques en leur sein. L\u2019objectif de nos travaux , outre les aspects acad\u00e9miques reli\u00e9s \u00e0 l\u2019optimisation microstructurale et&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":4962,"menu_order":40,"comment_status":"closed","ping_status":"closed","template":"","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":"389,388,1,387","_relevanssi_noindex_reason":"","footnotes":""},"tags":[],"class_list":["post-4970","page","type-page","status-publish","hentry","entry","no-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>Axe Alliages \u00e0 Haute Entropie - 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\/equipes-2\/pmm\/axe-alliages-a-haute-entropie\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Axe Alliages \u00e0 Haute Entropie - Laboratoire Georges Friedel\" \/>\n<meta property=\"og:description\" content=\"[vc_row][vc_column][vc_column_text]Ce concept repose sur une approche thermodynamique pr\u00e9voyant que certains m\u00e9langes d\u2019au moins 5 \u00e9l\u00e9ments en (presque) \u00e9qui-proportions, peuvent former une solution solide stable (gr\u00e2ce \u00e0 la forte entropie du m\u00e9lange) malgr\u00e9 la pr\u00e9sence de plusieurs \u00e9l\u00e9ments chimiques en leur sein. 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