| Title: | Cast microstructure of a complex concentrated noble alloy ▫$Ag_{20}Pd_{20}Pt_{20}Cu_{20}Ni_{20}▫$ |
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| Authors: | ID Terzić, Lidija (Author)
ID Rudolf, Rebeka (Author)
ID Majerič, Peter (Author)
ID Anžel, Ivan (Author) |
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| Files: |  materials-15-04788-v2.pdf (4,00 MB)
MD5: 566BD39EE5D8B4F41FFAC672A9E3417C
 https://www.mdpi.com/1996-1944/15/14/4788
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | 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. |
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| Keywords: | complex concentrated noble alloy, high—entropy alloy, metastability |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 08.06.2022 |
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| Article acceptance date: | 06.07.2022 |
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| Publication date: | 08.07.2022 |
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| Publisher: | MDPI |
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| Year of publishing: | 2022 |
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| Number of pages: | 14 str. |
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| Numbering: | Vol. 15, iss. 14 (4788) |
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| PID: | 20.500.12556/DKUM-92209  |
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| UDC: | 621.74:620.1 |
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| ISSN on article: | 1996-1944 |
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| COBISS.SI-ID: | 114803715 |
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| DOI: | 10.3390/ma15144788 |
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| Copyright: | © 2022 by the authors. |
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| Publication date in DKUM: | 20.03.2025 |
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| Views: | 157 |
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| Downloads: | 19 |
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| Metadata: |    |
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| Categories: | Misc.
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