20.500.12556/DKUM-97612 Microstructural evolution in the stir zone of a friction-stir-processed microalloyed Al-Mn-Cu alloy The study investigates the microstructure evolution in the stir zone produced by the friction stir processing (FSP) of a heat-treated microalloyed Al-Mn-Cu alloy in the area subjected to the highest temperature, strain, and strain rate. The samples were studied using electron microscopy and atom probe tomography (APT) to obtain structural and chemical information from the macro to the nano scale. FSP refines the dendritic Al-rich solid solution grains through dynamic recrystallisation in the range of a few micrometres. The primary intermetallic phases were dispersed to the particles in the 0.5–3 µm range and transformed mainly into a more stable τ1-Al29Mn6Cu4 phase. The fraction of dispersed particles after FSP increased due to the precipitation from the solid solution during cooling. The nanoscale quasicrystalline precipitates in the matrix, formed upon heat treatment, dissolved entirely during FSP, while the strong coarsening of the L12 precipitates occurred due to high temperatures in the stir zone. After FSP, the hardness of the stir zone was nearly identical for specimens in the as-cast and heat-treated conditions. microscopy friction stir processing aluminium microstructure atom probe tomography mikroskopija obdelava in varjenje s trenjem in mešanjem aluminij mikrostrukura tomografija atomske sonde true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/2075-4701/16/3/358 Članek v reviji 2026-03-25 03:14:02 2026-03-26 14:28:25 2026-03-31 13:57:06 0000-00-00 00:00:00 2026 0 0 18 str. iss. 3, [article no.] 358 Vol. 16 March 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2026-02-27 2026-03-21 2026-03-23 621.74:669.2/.8 272890115 10.3390/met16030358 2075-4701 metals-16-00358.pdf metals-16-00358.pdf 1 26A9B3DDD524CDFBF02EBA284D19796E b9b3a85230feb9331b4086a9dc9eb1ad54f725903176bc09311ec7a48a184bd7 e3b8a65b-2917-11f1-a0a6-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=204823 https://www.mdpi.com/2075-4701/16/3/358 1 4be7ab8b-27f0-11f1-bbad-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=204769 Fakulteta za strojništvo 0 0 0