Special Issue "Development of High Entropy Alloys"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Materials".

Deadline for manuscript submissions: 31 May 2020.

Special Issue Editor

Dr. Bharat Gwalani
E-Mail Website
Guest Editor
Pacific Northwest National Laboratory, Richland, United States
Interests: high-entropy alloys; atom probe tomography; additive manufacturing; shear-assisted alloying; high strain rate deforamtion

Special Issue Information

Dear Colleagues,

High-entropy alloys offer an ability to engineer unique microstructures achieved by manipulating their compositional complexity. Often, the experimentally-observed, single-phase high-entropy alloy (HEA) is the result of second-phase precipitation constrained by thermodynamic and/or kinetic factors. Several metastable phases, which are not predicted by equilibrium phase diagrams, are also often reported to be present in HEAs. Further, a large microstructural variation is noted in these alloys when processed using different processing routes, due to abundant mutually exclusive phase transformation pathways. These dramatically different phase transformation pathways can lead to some rather exceptional mechanical properties that can also vary over a large range. In addition, several reports have suggested that the deformation mechanisms of HEAs can be fundamentally different compared to solute lean alloys. With the rapidly growing interest in HEAs, this symposium aims to bring the worldwide HEA research community together to present and discuss the latest results on microstructural engineering and resultant unique properties that can be achieved using HEAs.

The areas of interest for this Special Issue are novel microstructures in HEAs, unconventional strengthening phases, the metastability engineering of phases, multiple strengthening mechanisms due to the hierarchical effect of microstructures, and other novel topics within HEAs. Both experimental and computational works on these topics are welcome.

Dr. Bharat Gwalani
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 papers will be 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. Crystals is an international peer-reviewed open access monthly 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 1600 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

  • Characterization
  • Mechanical properties
  • Deformation
  • Dislocations
  • Transformation pathways
  • Metastability

Published Papers (1 paper)

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Research

Open AccessArticle
Wear and Corrosion Behaviour of Supersaturated Surface Layers in the High-Entropy Alloy Systems CrMnFeCoNi and CrFeCoNi
Crystals 2020, 10(2), 110; https://doi.org/10.3390/cryst10020110 - 12 Feb 2020
Abstract
The surface hardening of single-face-centred cubic (fcc)-phase CrMnFeCoNi and the manganese-free CrFeCoNi alloy was conducted using low-temperature nitrocarburisation. The microstructural investigations reveal the successful formation of a homogeneous diffusion layer with a thickness of approximately 16 µm. The interstitial solution of carbon and [...] Read more.
The surface hardening of single-face-centred cubic (fcc)-phase CrMnFeCoNi and the manganese-free CrFeCoNi alloy was conducted using low-temperature nitrocarburisation. The microstructural investigations reveal the successful formation of a homogeneous diffusion layer with a thickness of approximately 16 µm. The interstitial solution of carbon and nitrogen causes an anisotropic lattice expansion. The increase in microhardness is in accordance to the graded concentration profile of the interstitial elements. Wear tests show a significantly enhanced resistance at different loads. The electrochemical tests reveal no deterioration in the corrosion resistance. The absence of precipitates is proven by microstructural investigations. The results prove the applicability of the concept of solution hardening by the formation of supersaturated solutions for the material group of high-entropy alloys. Hence, an increase of entropy with the consideration of lattice interstices provides new development approaches. Full article
(This article belongs to the Special Issue Development of High Entropy Alloys)

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Tentative Title: Stable and Metastable Phases in HfNbTaTiZr Alloy: Structure and Mechanical Properties
Tentative Author: Jakub Cizek; Charles University
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