{"id":6342,"date":"2026-06-26T10:14:03","date_gmt":"2026-06-26T15:14:03","guid":{"rendered":"https:\/\/cqfa.quebec\/?p=6342"},"modified":"2026-06-26T10:16:15","modified_gmt":"2026-06-26T15:16:15","slug":"effect-of-heat-treatment-on-microstructure-and-mechanical-properties-of-aa2219-al-cu-alloy-processed-by-laser-powder-bed-fusion","status":"publish","type":"post","link":"https:\/\/cqfa.quebec\/en\/effect-of-heat-treatment-on-microstructure-and-mechanical-properties-of-aa2219-al-cu-alloy-processed-by-laser-powder-bed-fusion\/","title":{"rendered":"Effect of heat treatment on microstructure and mechanical properties of AA2219 Al-Cu alloy processed by Laser Powder Bed Fusion"},"content":{"rendered":"<p><em>Tumulu, S.K.; Li, Z.; Brochu, M. (2026). Effect of heat treatment on microstructure and mechanical properties of AA2219 Al-Cu alloy processed by Laser Powder Bed Fusion. Next Materials., vol. 12, 2026, 102216.<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>This study investigated the Laser Powder Bed Fusion (LPBF) processing and heat treatment response of the Al-Cu alloy AA2219. Fully dense samples with a relative density of 99.90\u202f\u00b1\u202f0.05% were produced. Age hardening response was studied via T5 and T6 heat treatments with artificial aging up to 24 hrs. Transmission electron microscopy (TEM) analysis of the as-built (AB), T5 and T6 samples were conducted to quantify the distribution of Cu in the system in the various phases (solid solution, \u0398-Al<sub>2<\/sub>Cu, \u0398\u2032 and \u0398\u2033) to understand the strengthening response. The mechanical properties were assessed for the AB sample and the peak-aged T5 and T6 samples. Microhardness increased from 85\u202f\u00b1\u202f4 HV0.2 in the AB condition to 101\u202f\u00b1\u202f3 HV0.2 and 145\u202f\u00b1\u202f2 HV0.2 for T5 and T6 conditions, respectively. The yield strength (YS), ultimate tensile strength (UTS), and elongation at fracture of the AB and T5 samples were 94\u202f\u00b1\u202f6\u202fMPa, 288\u202f\u00b1\u202f6\u202fMPa, 8.7\u202f\u00b1\u202f1.5% and 98\u202f\u00b1\u202f8\u202fMPa, 295\u202f\u00b1\u202f8\u202fMPa, 6.0\u202f\u00b1\u202f0.7%, respectively, which indicates that the T5 heat treatment had no significant influence on these properties. T6 heat treatment showed a significant increase in YS (266\u202f\u00b1\u202f5\u202fMPa), UTS (411\u202f\u00b1\u202f6\u202fMPa) and elongation at fracture (12.4\u202f\u00b1\u202f2.7%). The improvement in microhardness and tensile strength from AB to T5 and T6 arises from the distribution of fine \u03b8\u2033 and \u03b8\u2032 precipitates, which impedes dislocation motion. The energy of initiation (<em>E<sub>i<\/sub><\/em>) of the AB, T5 and T6 samples were 4.5\u202fJ, 3.6\u202fJ and 4.2\u202fJ, respectively. The energy of propagation (<em>E<sub>p<\/sub><\/em>) exhibited a declining trend across AB, T5, and T6 conditions, measuring 6.5\u202fJ, 4.9\u202fJ, and 3.9\u202fJ, respectively. This variation in behavior is attributed to a shift in fracture mechanism, from activation of a single slip system during tensile loading, to activation of multiple slip systems under impact loading.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"link-btn-style btn-yellow\"><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2949822826006337\" target=\"_blank\" rel=\"noopener\">Read the publication<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tumulu, S.K.; Li, Z.; Brochu, M. (2026). Effect of heat treatment on microstructure and mechanical properties of AA2219 Al-Cu alloy processed by Laser Powder Bed Fusion. Next Materials., vol. 12, [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-6342","post","type-post","status-publish","format-standard","hentry","category-publications-academiques-quebecoises"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Effect of heat treatment on microstructure and mechanical properties of AA2219 Al-Cu alloy processed by Laser Powder Bed Fusion - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive<\/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:\/\/cqfa.quebec\/en\/effect-of-heat-treatment-on-microstructure-and-mechanical-properties-of-aa2219-al-cu-alloy-processed-by-laser-powder-bed-fusion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Effect of heat treatment on microstructure and mechanical properties of AA2219 Al-Cu alloy processed by Laser Powder Bed Fusion - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive\" \/>\n<meta property=\"og:description\" content=\"Tumulu, S.K.; Li, Z.; Brochu, M. 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