{"id":6609,"date":"2025-04-21T14:58:34","date_gmt":"2025-04-21T12:58:34","guid":{"rendered":"https:\/\/www.mines-stetienne.fr\/lgf\/?p=6609"},"modified":"2025-04-07T15:09:45","modified_gmt":"2025-04-07T13:09:45","slug":"les-super-pouvoirs-des-revetements-nanolamines-al2o3-al","status":"publish","type":"post","link":"https:\/\/www.mines-stetienne.fr\/lgf\/les-super-pouvoirs-des-revetements-nanolamines-al2o3-al\/","title":{"rendered":"Les super-pouvoirs des rev\u00eatements nanolamin\u00e9s Al2O3\/Al"},"content":{"rendered":"\n<p>Le Graal pour tout ing\u00e9nieur en m\u00e9canique est de pouvoir utiliser un mat\u00e9riau poss\u00e9dant une grande duret\u00e9, une bonne capacit\u00e9 \u00e0 se d\u00e9former sans casser et une bonne r\u00e9sistance \u00e0 la fissuration. Cependant, ces trois propri\u00e9t\u00e9s sont antagonistes pour la plupart des mat\u00e9riaux. Une \u00e9quipe de l&#8217;UCLouvain et du WEL Research Institute, en collaboration avec les universit\u00e9s de Namur, de Anvers, ont d\u00e9velopp\u00e9 un nouveau type de rev\u00eatement aux propri\u00e9t\u00e9s m\u00e9caniques exceptionnelles\u00a0: un nanolamin\u00e9 qui alterne de fines couches d\u2019alumine Al<sub>2<\/sub>O<sub>3<\/sub>\u00a0amorphe, de typiquement 100nm, avec des couches encore plus fines d\u2019aluminium. Paul Baral et Morgan Rusinowicz, deux enseignants-chercheurs du Laboratoire Georges Friedel UMR5307 Mines Saint-Etienne \/ CNRS Ing\u00e9nierie ont particip\u00e9 \u00e0 cette extraordinaire aventure.<\/p>\n\n\n\n<p>L\u2019invention de ce mat\u00e9riau, produit par d\u00e9p\u00f4t physique, est bas\u00e9e sur le principe que Al<sub>2<\/sub>O<sub>3<\/sub> amorphe est ductile \u00e0 une \u00e9paisseur inf\u00e9rieure \u00e0 environ 100nm. Pour obtenir un rev\u00eatement utile plus \u00e9pais, il convenait donc d\u2019empiler de telles couches tr\u00e8s fines en utilisant la colle appropri\u00e9e. Cette colle est fournie par l\u2019aluminium, donnant des interfaces tr\u00e8s r\u00e9sistantes avec l\u2019alumine, tout en amenant \u00e9galement une capacit\u00e9 de dissipation d\u2019\u00e9nergie et d\u2019arr\u00eat des fissures apparaissant \u00e0 un moment dans l\u2019Al<sub>2<\/sub>O<sub>3<\/sub>. Le r\u00e9sultat est le rev\u00eatement mince (plus fin que le microm\u00e8tre) ayant la plus haute combinaison contenue de r\u00e9sistance, mesurant la duret\u00e9 du mat\u00e9riau, de ductilit\u00e9, mesurant la capacit\u00e9 de se d\u00e9former sans se rompre, et de t\u00e9nacit\u00e9, mesurant la capacit\u00e9 \u00e0 ne pas se fissurer en pr\u00e9sence de d\u00e9fauts. Ce nanolamin\u00e9 poss\u00e8de une limite d\u2019\u00e9lasticit\u00e9 de l\u2019ordre de 4 GPa, \u00e9quivalent aux oxydes m\u00e9talliques tout en maintenant une t\u00e9nacit\u00e9 de 6.6 MPa.m<sup>1\/2<\/sup> comparable \u00e0 celle du Cuivre en couche mince. En sus, ce mat\u00e9riau b\u00e9n\u00e9ficie de l\u2019excellente r\u00e9sistance \u00e0 la corrosion de l\u2019alumine. Le grand d\u00e9fi de cette recherche a \u00e9t\u00e9 de d\u00e9terminer avec pr\u00e9cision les propri\u00e9t\u00e9s intrins\u00e8ques de ce rev\u00eatement et des couches ind\u00e9pendantes et d\u2019ensuite les lier aux m\u00e9canismes physiques conditionnant ces excellentes propri\u00e9t\u00e9s. Pour ce faire, l\u2019\u00e9quipe a eu recours \u00e0 l&#8217;approche nanom\u00e9canique brevet\u00e9e de l&#8217;UCLouvain d\u2019essai sur puce reposant sur des m\u00e9thodes de fabrication micro\u00e9lectronique, \u00e0 des essais de traction et de la caract\u00e9risation dans un microscope \u00e9lectronique \u00e0 transmission, \u00e0 de la nanoindentation ainsi que de la mod\u00e9lisation \u00e9l\u00e9ments finis. Les applications envisag\u00e9es sont nombreuses en particulier dans le cadre de technologies impliquant des environnements s\u00e9v\u00e8res combinant corrosion, \u00e9rosion, usure et chocs m\u00e9caniques. Ces travaux sont publi\u00e9s dans la revue <em>Nature Communications<\/em>.<\/p>\n\n\n\n<p><a href=\"https:\/\/doi.org\/10.1038\/s41467-025-56512-7\">Paul Baral, Sahar Jaddi, Hui Wang, Andrey Orekhov, Nicolas Gauquelin, Alireza Bagherpour, Frederik Van Loock, Micha\u00ebl Coulombier, Audrey Favache, Morgan Rusinowicz, Johan Verbeeck, St\u00e9phane Lucas, Jean-Pierre Raskin, Hosni Idrissi, and Thomas Pardoen, <strong>Al<\/strong><sub><strong>2<\/strong><\/sub><strong>O<\/strong><sub><strong>3<\/strong><\/sub><strong>\/Al hybrid nanolaminates with superior toughness, strength and ductility, <\/strong><em>Nature Communications Volume 16, Article number: 1355<\/em> (2025)<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le Graal pour tout ing\u00e9nieur en m\u00e9canique est de pouvoir utiliser un mat\u00e9riau poss\u00e9dant une grande duret\u00e9, une bonne capacit\u00e9 \u00e0 se d\u00e9former sans casser et une bonne r\u00e9sistance \u00e0 la fissuration. Cependant, ces trois propri\u00e9t\u00e9s sont antagonistes pour la plupart des mat\u00e9riaux. Une \u00e9quipe de l&#8217;UCLouvain et du WEL Research Institute, en collaboration avec&hellip;<\/p>\n","protected":false},"author":1474,"featured_media":6610,"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":"6204,6176,6473,6372,5980,6384","_relevanssi_noindex_reason":"","footnotes":""},"categories":[75],"tags":[35],"post_series":[],"class_list":["post-6609","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","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>Les super-pouvoirs des rev\u00eatements nanolamin\u00e9s Al2O3\/Al - 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\/les-super-pouvoirs-des-revetements-nanolamines-al2o3-al\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les super-pouvoirs des rev\u00eatements nanolamin\u00e9s Al2O3\/Al - Laboratoire Georges Friedel\" \/>\n<meta property=\"og:description\" content=\"Le Graal pour tout ing\u00e9nieur en m\u00e9canique est de pouvoir utiliser un mat\u00e9riau poss\u00e9dant une grande duret\u00e9, une bonne capacit\u00e9 \u00e0 se d\u00e9former sans casser et une bonne r\u00e9sistance \u00e0 la fissuration. Cependant, ces trois propri\u00e9t\u00e9s sont antagonistes pour la plupart des mat\u00e9riaux. 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