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Composition, Structure, Properties Relations in Compositionally Complex and High-Entropy Alloys
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Composition, Structure, Properties Relations in Compositionally Complex and High-Entropy Alloys

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Simulation and Design".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 9089

Special Issue Editor

Dr. Kirill V. Yusenko

E-Mail Website
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
Special Issues, Collections and Topics in MDPI journals

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

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

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

Published Papers (3 papers)

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Research

17 pages, 6251 KiB  
Article
Structure Zone Investigation of Multiple Principle Element Alloy Thin Films as Optimization for Nanoindentation Measurements
by Alan Savan, Timo Allermann, Xiao Wang, Dario Grochla, Lars Banko, Yordan Kalchev, Aleksander Kostka, Janine Pfetzing-Micklich and Alfred Ludwig
Materials 2020, 13(9), 2113; https://doi.org/10.3390/ma13092113 - 02 May 2020
Cited by 6 | Viewed by 2886
Abstract
Multiple principal element alloys, also often referred to as compositionally complex alloys or high entropy alloys, present extreme challenges to characterize. They show a vast, multidimensional composition space that merits detailed investigation and optimization to identify compositions and to map the composition ranges [...] Read more.
Multiple principal element alloys, also often referred to as compositionally complex alloys or high entropy alloys, present extreme challenges to characterize. They show a vast, multidimensional composition space that merits detailed investigation and optimization to identify compositions and to map the composition ranges where useful properties are maintained. Combinatorial thin film material libraries are a cost-effective and efficient way to create directly comparable, controlled composition variations. Characterizing them comes with its own challenges, including the need for high-speed, automated measurements of dozens to hundreds or more compositions to be screened. By selecting an appropriate thin film morphology through predictable control of critical deposition parameters, representative measured values can be obtained with less scatter, i.e., requiring fewer measurement repetitions for each particular composition. In the present study, equiatomic CoCrFeNi was grown by magnetron sputtering in different locations in the structure zone diagram applied to multinary element alloys, followed by microstructural and morphological characterizations. Increasing the energy input to the deposition process by increased temperature and adding high-power impulse magnetron sputtering (HiPIMS) plasma generators led to denser, more homogeneous morphologies with smoother surfaces until recrystallization and grain boundary grooving began. Growth at 300 °C, even without the extra particle energy input of HiPIMS generators, led to consistently repeatable nanoindentation load–displacement curves and the resulting hardness and Young’s modulus values. Full article
(This article belongs to the Special Issue Composition, Structure, Properties Relations in Compositionally Complex and High-Entropy Alloys)
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12 pages, 1471 KiB  
Article
Face-Centered Cubic Refractory Alloys Prepared from Single-Source Precursors
by Kirill V. Yusenko, Saiana Khandarkhaeva, Maxim Bykov, Tymofey Fedotenko, Michael Hanfland, Alexander Sukhikh, Sergey A. Gromilov and Leonid S. Dubrovinsky
Materials 2020, 13(6), 1418; https://doi.org/10.3390/ma13061418 - 20 Mar 2020
Cited by 4 | Viewed by 1905
Abstract
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
(This article belongs to the Special Issue Composition, Structure, Properties Relations in Compositionally Complex and High-Entropy Alloys)
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16 pages, 6382 KiB  
Article
Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations
by Shuaijiang Yan, Yun Wang, Qingxiang Wang, Chengsong Zhang, Dazhi Chen and Guodong Cui
Materials 2019, 12(20), 3336; https://doi.org/10.3390/ma12203336 - 13 Oct 2019
Cited by 17 | Viewed by 3153
Abstract
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
(This article belongs to the Special Issue Composition, Structure, Properties Relations in Compositionally Complex and High-Entropy Alloys)
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