20.500.12556/DKUM-92209 Cast microstructure of a complex concentrated noble alloy ▫$Ag_{20}Pd_{20}Pt_{20}Cu_{20}Ni_{20}▫$ A complex concentrated noble alloy (CCNA) of equiatomic composition (Ag20Pd20Pt20Cu20Ni20 –20 at. %) was studied as a potential high—performance material. The equiatomic composition was used so that this alloy could be classified in the subgroup of high—entropy alloys (HEA). The alloy was prepared by induction melting at atmospheric pressure, using high purity elements. The degree of metastability of the cast state was estimated on the basis of changes in the microstructure during annealing at high temperatures in a protective atmosphere of argon. Characterisation of the metallographically prepared samples was performed using a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), differential scanning calorimetry (DSC), and X–ray diffraction (XRD). Observation shows that the microstructure of the CCNA is in a very metastable state and multiphase, consisting of a continuous base of dendritic solidification—a matrix with an interdendritic region without other microstructural components and complex spheres. A model of the probable flow of metastable solidification of the studied alloy was proposed, based on the separation of L—melts into L1 (rich in Ni) and L2 (rich in Ag). The phenomenon of liquid phase separation in the considered CCNA is based on the monotectic reaction in the Ag−Ni system. complex concentrated noble alloy high—entropy alloy metastability metalurgija plast za plastjo zlitine kompleksna koncentrirana plemenita zlitina visokoentropijska zlitina metastabilnost true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/materials © 2022 by the authors. Članek v reviji 2025-03-20 13:48:44 2025-03-20 13:48:44 2025-03-21 03:10:51 0000-00-00 00:00:00 2022 0 0 14 str. iss. 14 (4788) Vol. 15 July 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-06-08 2022-07-06 2022-07-08 621.74:620.1 114803715 10.3390/ma15144788 1996-1944 materials-15-04788-v2.pdf materials-15-04788-v2.pdf 1 566BD39EE5D8B4F41FFAC672A9E3417C 166728d6e9454d0bc4e93d4395ed1cea0058ba6296d35a6a4e6e4751777d2f84 0e76e2f7-058a-11f0-9be3-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189530 https://www.mdpi.com/1996-1944/15/14/4788 1 a986629f-0589-11f0-9be3-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189529 Fakulteta za strojništvo 0 0 0