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Environmental Degradation of Multi-Principal-Element Alloys: Aspects of Corrosion and High-Temperature...
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Environmental Degradation of Multi-Principal-Element Alloys: Aspects of Corrosion and High-Temperature Oxidation

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 3959

Special Issue Editor

Prof. Dr. Carlos Alberto Della Rovere

E-Mail Website
Guest Editor
Department of Materials Engineering (DEMa), Federal University of Sao Carlos (UFSCar), Rodovia Washington Luís, km 235, São Carlos 13565-905, SP, Brazil
Interests: corrosion science; high-temperature oxidation; structural characterization; electrochemical techniques; stainless steels; multi-principal-element alloys; metallic alloys

Special Issue Information

Dear Colleagues,

Multi-principal-element alloys (MPEA) and high-entropy alloys (HEA) have attracted the attention of the metallurgy community because of the distinct and innovative concept on which their preparation is based. This concept involves the combination of several main elements in substantial concentrations, potentially resulting in metals with properties superior to those of traditional alloys, and hence breakthroughs in different industrial sectors, such as aerospace, petrochemicals, biomedical, and energy. However, the development of MPEA is still relatively recent, so their application is limited because many of their properties, such as their environmental degradation behavior (i.e., corrosion and high-temperature oxidation behavior), are still under investigation. Therefore, this Special Issue calls for high-quality papers, reports, and review articles on all aspects of corrosion and high-temperature oxidation behavior of MPEA in harsh environments, including but not limited to areas such as polarization behavior, passivity, selective leaching, corrosion mechanisms, testing, and protection, stress corrosion cracking as well as oxidation kinetics, selective and pest oxidation, scale formation, and coatings. Experimental studies addressing the effect of processing and structure on degradation behavior (or related phenomena) of MPEA are highly encouraged. Additionally, since the multi-dimensional composition space that can be explored with this new alloying concept is practically unlimited, we expect this issue to cover a wide variety of MPEA systems and their respective degradation behaviors. This will advance our understanding of the relationship between chemical composition, processing, microstructure, and environmental degradation properties for MPEA/HEA, as well as contribute to the design of novel advanced materials with enhanced corrosion/high-temperature oxidation properties.

Prof. Dr. Carlos Alberto Della Rovere
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. Metals 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 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

  • multi-principal element alloys
  • high-entropy alloys
  • complex concentrated alloys
  • microstructure
  • characterization
  • environmental degradation
  • corrosion
  • passive film
  • localized corrosion
  • high-temperature oxidation
  • oxidation kinetics
  • internal oxidation
  • oxide layer
  • polarization
  • electrochemical techniques
  • XPS
  • thermogravimetric analysis

Published Papers (2 papers)

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Research

11 pages, 3237 KiB  
Article
Effects of Al-Mg on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings
by Ziyue Zhang, Jie Zhang, Xingyuan Zhao, Xuequn Cheng, Sheming Jiang and Qifu Zhang
Metals 2023, 13(1), 46; https://doi.org/10.3390/met13010046 - 24 Dec 2022
Cited by 8 | Viewed by 2421
Abstract
In this work, the composition of the zinc–aluminum–magnesium alloy coating was designed to have a fixed aluminum–magnesium ratio of 1:1, while the content of aluminum and magnesium elements increases gradually within the range of 1–2 wt.%. The micro-morphology of the coating with different [...] Read more.
In this work, the composition of the zinc–aluminum–magnesium alloy coating was designed to have a fixed aluminum–magnesium ratio of 1:1, while the content of aluminum and magnesium elements increases gradually within the range of 1–2 wt.%. The micro-morphology of the coating with different compositions was observed by a scanning electron microscope (SEM). Combined with the surface distribution results of energy dispersive spectrometer (EDS) analysis elements and the phase analysis results of diffraction of X-rays (XRD), the phase distribution of the coating is understood. The statistical calculation of the phase distribution was carried out after staining the SEM image by ImageJ, This is consistent with the solidification simulation results of the thermodynamic simulation software (PADAT). The influence of magnesium and aluminum elements on the microscopic morphology and phase distribution of the zinc–aluminum–magnesium (ZnAlMg) coating was studied, and the mechanism of action was analyzed. The results show that the volume ratio of binary eutectic phase (Zn/MgZn2) and ternary eutectic phase (Zn/Al/MgZn2) in the coating tends to increase as the contents of the two elements elevate. The quantity of MgZn2 is the critical factor for the corrosion resistance of the coating; the more MgZn2, the better the corrosion resistance. Full article
(This article belongs to the Special Issue Environmental Degradation of Multi-Principal-Element Alloys: Aspects of Corrosion and High-Temperature Oxidation)
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15 pages, 4800 KiB  
Article
Effects of Yttrium on High Temperature Oxidation Resistance of W-Si-Y Self-Passivating Alloys
by Chao Ye, Shijie Chen, Wei Liu, Lihong Xue, Shengming Yin and Youwei Yan
Metals 2022, 12(12), 2040; https://doi.org/10.3390/met12122040 - 27 Nov 2022
Cited by 1 | Viewed by 1041
Abstract
Self-passivating W alloys have excellent high temperature oxidation resistance and are expected to be used as a key component in high temperature environment. In this study, a series of W-Si-xY self-passivating alloys were fabricated by mechanical alloying (MA) and spark plasma [...] Read more.
Self-passivating W alloys have excellent high temperature oxidation resistance and are expected to be used as a key component in high temperature environment. In this study, a series of W-Si-xY self-passivating alloys were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). Effects of Y content on phase compositions, microstructures, and oxidation resistance at high temperatures were investigated systematically. The results show that the oxidation resistance of the alloys increases with the increase of Y content (0.0~5.0 wt.%), but the oxidation resistance of the alloys deteriorates when the Y content reaches 9.6 wt.%. The alloy with 3.8 wt.% Y shows the best oxidation resistance. The thickness of its oxide layer is ~249.1 μm when the oxidation time reaches 80 h, which is thinner than that of other alloys. Effects of Y content on the oxidation resistance are revealed. During the oxidation process, Y can react with other elements to form molten-like W-Y-O and Y2Si2O7 particles. It is found that these two phases play a key role in the oxidation resistance of the alloys. When the Y content is in the range of 0~5.0 wt.%, a W-Y-O covering layer gradually forms with the increase of Y content, which can prevent further oxidation of the alloy. In the meantime, small Y2Si2O7 particles were formed and the microcracks formed around these particles were isolated, which have little effect on the oxidation resistance of the alloys. However, when Y content reaches 9.6 wt.%, large Y2Si2O7 particles and extensive cracks around them are formed. These cracks are interconnected to form penetrating channels for O2 from the environment to the alloy interior, which deteriorates the oxidation resistance of the alloys. Full article
(This article belongs to the Special Issue Environmental Degradation of Multi-Principal-Element Alloys: Aspects of Corrosion and High-Temperature Oxidation)
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