20.500.12556/DKUM-88439 Metastable states of complex concentrated Ag–Pd–Pt–Cu–Ni alloy obtained by synthesis of nanoparticles doctoral dissertation Metastabilna stanja kompleksne koncentrirane zlitine Ag–Pd–Pt–Cu–Ni, dosežena s sintezo nanodelcev doktorska disertacija Doctoral dissertation explores the synthesis and characterization of metastable states within a novel complex concentrated noble alloy (CCNA) composed of equi-atomic portion of silver (Ag), palladium (Pd), platinum (Pt), copper (Cu), and nickel (Ni). Completed research activities enable the understanding of processes and reactions that were crucial in evolution of thermodynamically metastable microstructures through production of rapidly solidified ribbons and synthesis of nanoparticles (NP). Two techniques, namely melt spinning and ultrasonic spray pyrolysis (USP) had been successfully used to achieve homogeneous high entropy microstructures and were confirmed as suitable for transformation of multiphase inhomogeneous CCNA microstructures into high entropy ones. Achieved thermodynamically metastable microstructures enable the achievement of potential functional properties of selected alloy due to increased surface area and optimized active centres (Ag, Pd, Pt, Cu, Ni) for catalytic activity. In the dissertation explained processes and reactions that occurred in the development of the microstructure of equi-atomic Ag-Pt-Pd-Cu-Ni CCNA during rapid solidification and ultrasonic spray pyrolysis represent an important contribution to the field of materials science. Doktorska disertacija obravnava sintezo in karakterizacijo metastabilnih stanj v novi kompleksni koncentrirani žlahtni zlitini z ekviatomarno vsebnostjo srebra (Ag), paladija (Pd), platine (Pt), bakra (Cu) in niklja (Ni). Opravljene raziskovalne aktivnosti omogočajo razumevanje procesov in reakcij, ki so bili ključni pri razvoju termodinamično metastabilnih mikrostruktur z izdelavo hitro strjenih trakov in s sintezo nanodelcev. Dve tehniki, in sicer litje taline na boben in ultrazvočna razpršilna piroliza (USP), sta bili uspešno uporabljeni za doseganje homogenih visokoentropijskih mikrostruktur in sta bili potrjeni kot primerni za transformacijo večfaznih nehomogenih CCNA mikrostruktur v visokoentropijske. Dosežene termodinamično metastabilne mikrostrukture omogočajo doseganje funkcionalnih lastnosti izbrane zlitine zaradi povečane površine in optimiziranih aktivnih centrov (Ag, Pd, Pt, Cu, Ni) za katalitično aktivnost. V disertaciji pojasnjeni procesi in reakcije, ki so se zgodili pri razvoju mikrostrukture ekviatomskega Ag–Pt–Pd–Cu–Ni CCNA med hitrim strjevanjem in USP, predstavljajo pomemben prispevek na področju znanosti o materialih. Complex concentrated alloys High entropy alloys Thermodynamically metastable microstructures Rapid solidification Ultrasonic spray pyrolysis. Kompleksne koncentrirane zlitine Visokoentropijske zlitine Termodinamsko metastabilne mikrostrukture Hitro strjevanje Ultrazvočna razpršilna piroliza true true false [L. Simić] Angleški jezik Slovenski jezik Doktorsko delo/naloga 2024-04-24 15:14:58 2026-01-06 11:20:21 2026-01-08 10:57:45 0000-00-00 00:00:00 2025 0 Maribor 0 Maribor XIII, 117 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669.21/.23.017.16:54-172(043.3) 263645699 DOK_Terzic_Lidija_2026.pdf DOK_Terzic_Lidija_2026.pdf 1 84299291A4B068F866BE5F73C0682528 d7f11be8827277a3ee6f5ed853894b71f6e64768664c157d1f7c6a78800a548d 9ac21362-e749-11f0-8c48-00155d580e02 https://dk.um.si/Dokument.php?lang=slv&id=201758 Fakulteta za strojništvo 0 0 0