{"id":54637,"date":"2026-04-29T08:00:44","date_gmt":"2026-04-29T12:00:44","guid":{"rendered":"https:\/\/www.uqac.ca\/uqactualites\/?p=54637"},"modified":"2026-04-24T14:01:35","modified_gmt":"2026-04-24T18:01:35","slug":"musa-muhammed-finissant-au-doctorat-en-ingenierie-soutient-sa-these","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2026\/04\/29\/musa-muhammed-finissant-au-doctorat-en-ingenierie-soutient-sa-these\/","title":{"rendered":"Musa Muhammed, finissant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se"},"content":{"rendered":"<p>Finissant au <a href=\"https:\/\/sae.uqac.ca\/bourses-detudes\/\">doctorat en ing\u00e9nierie<\/a>, Musa Muhammed, a effectu\u00e9 sa soutenance de th\u00e8se le 28 avril 2026. Sous la direction de recherche de <a href=\"https:\/\/portfolio.uqac.ca\/mousajavidani\/\" target=\"_blank\" rel=\"noopener\">Mousa Javidani<\/a> (UQAC) et la codirection de Mohammad Jahazi (\u00c9TS), sa th\u00e8se a pour titre \u00ab<em>Tribological performance enhancement of AlTiN\/AlTiCrN-based physical vapour deposition coatings for wood-processing application<\/em>\u00bb.<\/p>\n<p>Sous la pr\u00e9sidence de <a href=\"https:\/\/portfolio.uqac.ca\/dilipsarkar\/\" target=\"_blank\" rel=\"noopener\">Dilip Sarkar<\/a> (UQAC), le jury d&rsquo;\u00e9valuation \u00e9tait compos\u00e9 de Christian Moreau (Universit\u00e9 Concordia) et de Lei Ray Pan (Rio Tinto)<\/p>\n<hr \/>\n<h5>R\u00e9sum\u00e9 de la th\u00e8se<\/h5>\n<p>La nature stochastique de l\u2019usure des outils en usinage du bois, r\u00e9sultant de l\u2019interaction complexe entre les propri\u00e9t\u00e9s du mat\u00e9riau bois, les param\u00e8tres de coupe et les conditions environnementales, continue de poser des d\u00e9fis majeurs \u00e0 l\u2019efficacit\u00e9 des op\u00e9rations d\u2019usinage. Parall\u00e8lement, la demande industrielle croissante pour une durabilit\u00e9 accrue et des performances \u00e9conomiques renforc\u00e9es stimule l\u2019int\u00e9r\u00eat pour des strat\u00e9gies avanc\u00e9es d\u2019am\u00e9lioration tribologique, notamment l\u2019utilisation de rev\u00eatements c\u00e9ramiques d\u00e9pos\u00e9s par d\u00e9p\u00f4t physique en phase vapeur (PVD). Dans ce contexte, cette th\u00e8se examine trois facteurs fondamentaux, mais encore peu \u00e9tudi\u00e9s, qui gouvernent de mani\u00e8re critique les performances des rev\u00eatements AlTiN\/AlTiCrN destin\u00e9s aux applications d\u2019usinage du bois : (i) l\u2019\u00e9tat de surface du substrat avant d\u00e9p\u00f4t, (ii) la conception architecturale des rev\u00eatements multicouches, et (iii) la temp\u00e9rature de d\u00e9p\u00f4t. En isolant et en analysant syst\u00e9matiquement chacun de ces param\u00e8tres, ce travail vise \u00e0 \u00e9tablir un cadre scientifique coh\u00e9rent pour optimiser le comportement des rev\u00eatements et combler des lacunes importantes dans l\u2019am\u00e9lioration des performances tribologiques des aciers \u00e0 outils rev\u00eatus.<\/p>\n<details>\n<summary><strong>Voir plus<\/strong><\/summary>\n<p>La premi\u00e8re \u00e9tude exp\u00e9rimentale analyse l\u2019effet de la rugosit\u00e9 du substrat (Ra = 0,0025 \u00e0 1,7 \u03bcm) sur les performances tribologiques d\u2019un acier \u00e0 outil AISI A8 rev\u00eatu d\u2019AlTiN\/AlTiCrN. Gr\u00e2ce \u00e0 des essais de nanoindentation, des analyses d\u2019adh\u00e9rence, des caract\u00e9risations microstructurales et des tests d\u2019usure abrasive, l\u2019\u00e9tude montre que les substrats plus lisses favorisent une texture cristallographique (111) plus marqu\u00e9e, une duret\u00e9 sup\u00e9rieure, une meilleure r\u00e9sistance \u00e0 la fracture ainsi qu\u2019une adh\u00e9rence accrue. Ces effets synergiques se traduisent par une r\u00e9duction d\u2019environ 15 % du taux d\u2019usure par rapport aux substrats plus rugueux. Les r\u00e9sultats soulignent l\u2019importance cruciale de la pr\u00e9paration du substrat et d\u00e9montrent que l\u2019optimisation de la rugosit\u00e9 constitue un levier essentiel pour am\u00e9liorer le comportement tribologique des outils rev\u00eatus utilis\u00e9s en usinage du bois.<\/p>\n<p>La deuxi\u00e8me \u00e9tude exp\u00e9rimentale examine la performance tribologique de rev\u00eatements multicouches AlTiN\/AlTiCrN con\u00e7us avec des architectures bilayer et trilayer, d\u00e9pos\u00e9s par PVD \u00e0 \u00e9vaporation cathodique. Trois configurations, d\u00e9sign\u00e9es AlTiCrN I, II et III, ont \u00e9t\u00e9 \u00e9valu\u00e9es en termes de microstructure, densit\u00e9 de d\u00e9fauts, texture cristallographique, duret\u00e9, adh\u00e9rence, r\u00e9sistance \u00e0 la fracture et comportement \u00e0 l\u2019usure. Les architectures trilayer (AlTiCrN II et III) pr\u00e9sentent une densit\u00e9 de macroparticules plus faible, une surface plus lisse, une orientation (111) renforc\u00e9e et des propri\u00e9t\u00e9s m\u00e9caniques<\/p>\n<p>nettement am\u00e9lior\u00e9es par rapport au rev\u00eatement bilayer (AlTiCrN I). De plus, le rev\u00eatement AlTiCrN III atteint les meilleures performances, avec des taux d\u2019usure inf\u00e9rieurs de 29 % et 15 % \u00e0 ceux des rev\u00eatements AlTiCrN I et II, respectivement. Cette performance sup\u00e9rieure est attribu\u00e9e \u00e0 sa duret\u00e9 plus \u00e9lev\u00e9e, \u00e0 sa meilleure adh\u00e9rence, \u00e0 son architecture optimis\u00e9e et \u00e0 sa r\u00e9duction des d\u00e9fauts de surface. L\u2019\u00e9tude d\u00e9montre ainsi le potentiel strat\u00e9gique de l\u2019ing\u00e9nierie architecturale pour am\u00e9liorer la fonctionnalit\u00e9 des rev\u00eatements en usinage du bois.<\/p>\n<p>La derni\u00e8re \u00e9tude exp\u00e9rimentale porte sur l\u2019influence de la temp\u00e9rature de d\u00e9p\u00f4t (350 \u2013 450 \u00b0C, d\u00e9sign\u00e9e T350 \u00e0 T450) sur l\u2019\u00e9volution microstructurale, les propri\u00e9t\u00e9s m\u00e9caniques et le comportement \u00e0 l\u2019usure des rev\u00eatements AlTiN\/AlTiCrN d\u00e9pos\u00e9s sur acier AISI A8. Les r\u00e9sultats montrent que, bien que le rev\u00eatement T400 pr\u00e9sente la duret\u00e9 la plus \u00e9lev\u00e9e (36 GPa) due \u00e0 des cristallites plus fines et une microd\u00e9formation accrue, sa densit\u00e9 sup\u00e9rieure de macroparticules et sa rugosit\u00e9 plus importante compromettent sa performance tribologique. \u00c0 l\u2019inverse, le rev\u00eatement T350 offre la meilleure r\u00e9sistance globale \u00e0 l\u2019usure, avec des taux d\u2019usure inf\u00e9rieurs de 36 % et 56 % \u00e0 ceux de T400 et T450, respectivement. Cette performance optimale est attribu\u00e9e \u00e0 une adh\u00e9rence plus \u00e9lev\u00e9e (charge critique ~11 N), une surface plus lisse (Ra = 0,25 \u03bcm), une \u00e9paisseur accrue (2,8 \u03bcm) et un rapport H\/E plus favorable, malgr\u00e9 une duret\u00e9 interm\u00e9diaire. Ces r\u00e9sultats mettent en \u00e9vidence la nature sp\u00e9cifique du r\u00f4le thermique dans les rev\u00eatements PVD \u00e0 arc cathodique et montrent que 350 \u00b0C constitue une temp\u00e9rature optimale pour un compromis id\u00e9al entre propri\u00e9t\u00e9s microstructurales et performance tribologique en environnement d\u2019usinage du bois.<\/p>\n<p>Dans l\u2019ensemble, cette th\u00e8se propose une compr\u00e9hension int\u00e9gr\u00e9e de l\u2019influence de l\u2019ing\u00e9nierie du substrat, de la conception architecturale et de la temp\u00e9rature de d\u00e9p\u00f4t sur les performances des rev\u00eatements AlTiN\/AlTiCrN utilis\u00e9s en usinage du bois. Les r\u00e9sultats contribuent \u00e0 l\u2019avancement des connaissances en tribologie des rev\u00eatements durs et fournissent une base scientifique pour le d\u00e9veloppement de syst\u00e8mes de rev\u00eatements de nouvelle g\u00e9n\u00e9ration offrant une durabilit\u00e9, une adh\u00e9rence et une r\u00e9sistance \u00e0 l\u2019usure accrues.<\/p>\n<\/details>\n<hr \/>\n<p>F\u00e9licitations \u00e0 Musa Muhammed pour la soutenance de sa th\u00e8se de doctorat!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Finissant au doctorat en ing\u00e9nierie, Musa Muhammed, a effectu\u00e9 sa soutenance de th\u00e8se le 28 avril 2026. Sous la direction de recherche de Mousa Javidani (UQAC) et la codirection de Mohammad Jahazi (\u00c9TS), sa th\u00e8se a pour titre \u00abTribological performance enhancement of AlTiN\/AlTiCrN-based physical vapour deposition coatings for wood-processing application\u00bb. Sous la pr\u00e9sidence de Dilip [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":54641,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2913],"tags":[21,247,293],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Musa Muhammed, finissant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.uqac.ca\/uqactualites\/2026\/04\/29\/musa-muhammed-finissant-au-doctorat-en-ingenierie-soutient-sa-these\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Musa Muhammed, finissant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Finissant au doctorat en ing\u00e9nierie, Musa Muhammed, a effectu\u00e9 sa soutenance de th\u00e8se le 28 avril 2026. 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