20.500.12556/RUL-170422 Microstructural stability and high-temperature mechanical behavior of Al–Ni–Zr alloy strengthened by L1▫$_2$▫-Al▫$_3$▫Zr precipitates Aluminum alloys based on the eutectic Al–Ni system are a promising class of lightweight materials for applications at elevated temperatures owing to the thermal stability of the eutectic Al▫$_3$▫Ni phase. In this study, the eutectic Al–Ni alloy was modified by the addition of 0.6 wt.% Zr to enhance the αAl matrix by precipitation strengthening. The alloys were cast and subjected to T5 heat treatment followed by long-term isothermal aging at 350 ◦C. A comprehensive study was carried out to evaluate the evolution of microstructure, micro-hardness and mechanical performance over time. The formation of fine, coherent L1▫$_2$▫-Al▫$_3$▫Zr precipitates contributed to significant strengthening, as reflected by a ~60% increase in microhardness and an approximately twofold improvement in room temperature (RT) yield strength. A TEM analysis of the L1▫$_2$▫-Al▫$_3$▫Zr precipitates showed relatively good thermal stability after 30 days. Despite the improved mechanical properties at room temperature, the alloy did not retain this improvement when tested at 300 ◦C. Nevertheless, these results provide a comprehensive insight into the aging and thermal stability of Al–Ni–Zr alloys. aluminum–nickel eutectic precipitation strengthening microhardness accelerated creep test eutektik aluminij-nikelj izločevalno utrjevanje mikrotrdota pospešeni testi lezenja true false true Angleški jezik Slovenski jezik Članek v reviji 2025-07-04 14:23:36 2025-07-04 14:23:45 2025-07-06 03:45:13 0000-00-00 00:00:00 2025 0 0 13 str. issue 13, art. 3068 Vol. 18 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 1996-1944 10.3390/ma18133068 241210371 RAZ_Smalc_Jan_2025.pdf RAZ_Smalc_Jan_2025.pdf 1 25C2E3C08160750A74B5461E0B44ABE6 29eaa1db5c408a91e0424c9793bdf00bafaff032ffe56ff3dd8a89efdbf676fd 616144a1-58d0-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212423 https://www.mdpi.com/1996-1944/18/13/3068 1 d40e373b-58cf-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212422 Fakulteta za strojništvo Naravoslovnotehniška fakulteta 0 0 0