Special Issue "Composition, Structure, Properties Relations in Compositionally Complex and High-entropy Alloys"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 August 2020.

Special Issue Editor

Dr. Kirill V. Yusenko
Guest Editor
Federal Institute for Materials Research and Testing Berlin, 12489 Berlin, Germany
Interests: multicomponent alloys; single-source precursors for metals and alloys; x-ray diffraction; x-ray spectroscopy; in situ studies; high-pressure high-temperature studies
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Special Issue Information

Dear Colleagues,

The metallurgy of high-entropy and compositionally complex alloys is a rapidly growing field. The amount of experimental, thermodynamic, and theoretical information demonstrates the extensive growth in the area during the past several years. The high-entropy approach has been adopted not only in alloy development, but also in other fields of solid-state materials research. The rapid development of the field requires an understanding of the fundamental properties of model high-entropy alloy systems in order to enable us to shift our attention from an exploration of new compositions using trial-and-error search as well as systematic and high-throughput screenings to a development of industry-relevant functional systems for their further applications.

The main recent trends in high-entropy alloy design include the involvement of as many as possible elements as principle components including rare and refractory metals; application of phase diagram modelling to design single- and dual-phase alloys with promising properties; developing an understanding of high-entropy alloys’ stability and transformations under mechanical, thermal, chemical, and pressure impact; application of complementary techniques such as in situ transmission electron microscopy, X-ray diffraction, and spectroscopy to characterise real structure, properties, and stability of multicomponent alloys under working conditions; and screening for the broader applications of high-entropy and compositionally complex alloys as superconductive, multiferroic, and especially catalytic materials.

This Special Issue welcomes original research papers and reviews on all aspects of high-entropy and compositionally complex alloys, with a special focus on their real structure and phase transformations under temperature, pressure, and mechanical impacts, as well as the construction and modelling of multicomponent phase diagrams to access new insights into the composition–structure–properties relations in multicomponent compositionally complex alloys. Submissions are especially welcomed which might open a door to novel routes for high-entropy alloy preparation, including high-throughput and operando approaches, as well as those that might reveal new frontiers in their applications.

Dr. Kirill V. Yusenko
Guest Editor

Manuscript Submission Information

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  • high-entropy alloys
  • compositionally complex alloys
  • composition–structure–properties relations
  • multicomponent phase diagrams
  • real structure
  • phase transformations

Published Papers (2 papers)

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Open AccessArticle
Face-Centered Cubic Refractory Alloys Prepared from Single-Source Precursors
Materials 2020, 13(6), 1418; https://doi.org/10.3390/ma13061418 - 20 Mar 2020
Three binary fcc-structured alloys (fcc–Ir0.50Pt0.50, fcc–Rh0.66Pt0.33 and fcc–Rh0.50Pd0.50) were prepared from [Ir(NH3)5Cl][PtCl6], [Ir(NH3)5Cl][PtBr6], [Rh(NH3 [...] Read more.
Three binary fcc-structured alloys (fcc–Ir0.50Pt0.50, fcc–Rh0.66Pt0.33 and fcc–Rh0.50Pd0.50) were prepared from [Ir(NH3)5Cl][PtCl6], [Ir(NH3)5Cl][PtBr6], [Rh(NH3)5Cl]2[PtCl6]Cl2 and [Rh(NH3)5Cl][PdCl4]·H2O, respectively, as single-source precursors. All alloys were prepared by thermal decomposition in gaseous hydrogen flow below 800 °C. Fcc–Ir0.50Pt0.50 and fcc–Rh0.50Pd0.50 correspond to miscibility gaps on binary metallic phase diagrams and can be considered as metastable alloys. Detailed comparison of [Ir(NH3)5Cl][PtCl6] and [Ir(NH3)5Cl][PtBr6] crystal structures suggests that two isoformular salts are not isostructural. In [Ir(NH3)5Cl][PtBr6], specific Br…Br interactions are responsible for a crystal structure arrangement. Room temperature compressibility of fcc–Ir0.50Pt0.50, fcc–Rh0.66Pt0.33 and fcc–Rh0.50Pd0.50 has been investigated up to 50 GPa in diamond anvil cells. All investigated fcc-structured binary alloys are stable under compression. Atomic volumes and bulk moduli show good agreement with ideal solutions model. For fcc–Ir0.50Pt0.50, V0/Z = 14.597(6) Å3·atom−1, B0 = 321(6) GPa and B0’ = 6(1); for fcc–Rh0.66Pt0.33, V0/Z = 14.211(3) Å3·atom−1, B0 =259(1) GPa and B0’ = 6.66(9) and for fcc–Rh0.50Pd0.50, V0/Z = 14.18(2) Å3·atom−1, B0 =223(4) GPa and B0’ = 5.0(3). Full article
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Open AccessArticle
Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations
Materials 2019, 12(20), 3336; https://doi.org/10.3390/ma12203336 - 13 Oct 2019
The present study aimed to optimize the phase constituents and mechanical properties of the spark plasma sintered (SPS) Inconel 718 (IN718) alloy. A series of heat treatment routes were designed based on the phase relations in IN718 and performed for the optimization. The [...] Read more.
The present study aimed to optimize the phase constituents and mechanical properties of the spark plasma sintered (SPS) Inconel 718 (IN718) alloy. A series of heat treatment routes were designed based on the phase relations in IN718 and performed for the optimization. The microstructure and phase compositions of the SPS IN718 alloys were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and transmission electron microscopy (TEM). The mechanical properties of the samples were characterized at room temperature and at 650 °C. The results showed that large amounts of γ” (Ni3Nb) and γ’ (Ni3(Al, Ti)) strengthening phases precipitated in the IN718 alloy after direct aging (DA) of the as-fabricated sample. Moreover, the mechanical properties of the DA sample were comparable to that of the best one of the solution-treated and aged counterparts. The analysis showed that the rapid sintering and solid solution treatment of the IN718 alloy were achieved simultaneously by SPS. In the case of the SPS IN718 material, the direct aging regime had the same heat treatment effect as the conventional solid solution and aging treatment. This contributes toward improving the production efficiency and reduces manufacturing costs in the actual production process. Full article
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