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Metals
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Extreme Environment Materials
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Extreme Environment Materials

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 10 May 2024 | Viewed by 8438

Special Issue Editor

Prof. Dr. Chunfeng Hu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Interests: advanced materials; microstructure; properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is our pleasure to invite you to contribute a paper on materials used in extreme environments. The present Special Issue will specifically focus on materials and evaluation methods which are suitable to be used in ultrahigh temperatures, ultralow temperatures, ultrahigh pressure, and ultrahigh irradiation environments. Our goal is for this issue to help your important research reach a wider audience and be cited by other materials scientists. In order to more clearly define what we mean with the term “extreme”, we are particularly interested in materials that can be adopted in deep space facilities, deep sea facilities, new-generation nuclear power plant facilities, etc., such as ultrahigh-speed vehicles, aeroengines, space engine, fusion reactors, etc. Research articles of any length, as well as short communications and review papers, are all welcome.

Prof. Dr. Chunfeng Hu
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

  • metals
  • ceramics
  • composites
  • high temperature
  • low temperature
  • high pressure
  • high irradiation

Published Papers (4 papers)

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Research

11 pages, 3021 KiB  
Article
The Fabrication and Mechanical Properties of Laminated ZrB2-Mo5SiB2 Ceramics with an Mo-Mo5SiB2 Interlayer
by Yanfang Wang, Mingliang Li, Hailong Wang, Gang Shao, Jinpeng Zhu, Wen Liu, Hailiang Wang, Bingbing Fan, Hongliang Xu, Hongxia Lu and Rui Zhang
Metals 2021, 11(12), 2018; https://doi.org/10.3390/met11122018 - 14 Dec 2021
Cited by 5 | Viewed by 2082
Abstract
The excellent physical and chemical properties of ultra-high temperature ceramics make them suitable for many high-temperature structural components, while their poor toughness and high sintering temperature become key limitations to their application. Laminated toughening has long been considered an effective toughening method to [...] Read more.
The excellent physical and chemical properties of ultra-high temperature ceramics make them suitable for many high-temperature structural components, while their poor toughness and high sintering temperature become key limitations to their application. Laminated toughening has long been considered an effective toughening method to improve the mechanical properties of ceramics. In this study, laminated ZrB2-Mo5SiB2 ceramics with an Mo-Mo5SiB2 interlayer were fabricated by tape casting and hot press sintering at 1900 °C for 2 h. Different layer thickness ratios between the matrix layer and the interlayer were designed to illustrate the toughening mechanism. Both the fracture toughness and flexural strength of the laminated ceramics showed a trend of first increasing and then decreasing with the increase of the layer thickness ratio. High fracture toughness (9.89 ± 0.26 MPa·m1/2) and flexural strength (431.6 ± 15.1 MPa) were obtained when the layer thickness ratio was 13. The improvement in fracture toughness of the laminated ceramics could be attributed to the generation of the residual stress, the deflection and the bifurcation of the cracks. Residual stress that developed in the laminated ceramics was also evaluated. Full article
(This article belongs to the Special Issue Extreme Environment Materials)
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11 pages, 5663 KiB  
Article
Fabrication, Microstructure, and Properties of In Situ V2C-Reinforced Copper Composites
by Yu Quan, Baotong Hu, Shuai Fu, Detian Wan, Yiwang Bao, Qingguo Feng, Salvatore Grasso and Chunfeng Hu
Metals 2021, 11(11), 1829; https://doi.org/10.3390/met11111829 - 13 Nov 2021
Cited by 3 | Viewed by 1514
Abstract
In this paper, in situ V2C-reinforced Cu composites were successfully fabricated by hot pressing at 750 °C under 25 MPa using Cu and V2SnC powders. Due to decomposition of V2SnC to V2C and Sn during [...] Read more.
In this paper, in situ V2C-reinforced Cu composites were successfully fabricated by hot pressing at 750 °C under 25 MPa using Cu and V2SnC powders. Due to decomposition of V2SnC to V2C and Sn during sintering, Sn atoms entered the crystal structure of Cu. Therefore, final compositions of composites consisted of Cu(Sn) and V2C phases. Here, copper composites with 0, 5, 10, 20, and 30 vol.% V2C were designed. Their microstructures and physical and mechanical properties were systematically investigated. It was observed that with increasing V2C content, electrical conductivity decreased from 0.589 × 108 S·m−1 to 0.034 × 108 S·m−1 and thermal conductivity decreased from 384.36 W⋅m−1⋅K−1 to 24.65 W·m−1·K−1, while Vickers hardness increased from 52.6 HV to 334 HV. Furthermore, it was found that composites with 20 vol.% V2C had the highest tensile strength (440 MPa). Full article
(This article belongs to the Special Issue Extreme Environment Materials)
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8 pages, 4064 KiB  
Article
Synthesis of θ-Al2O3 Whiskers with Twins
by Nan Liao, Xiaojia Su, Haiwen Zhang, Qingguo Feng, Salvatore Grasso and Chunfeng Hu
Metals 2021, 11(6), 895; https://doi.org/10.3390/met11060895 - 30 May 2021
Viewed by 1929
Abstract
In this work, θ-Al2O3 whiskers with twins were successfully fabricated by a hydrothermal method followed by annealing at 1000 °C in argon atmosphere using Al2(SO4)3·18H2O, CO(NH2)2 and PEG2000 as [...] Read more.
In this work, θ-Al2O3 whiskers with twins were successfully fabricated by a hydrothermal method followed by annealing at 1000 °C in argon atmosphere using Al2(SO4)3·18H2O, CO(NH2)2 and PEG2000 as initial materials. It is confirmed that precursor of AlO(OH) whiskers is suitable to be used for preparing alumina whiskers when the molar ratio of Al3+:CO(NH2)2 is selected to be 1:6. The mean length of obtained whiskers is 1.5 μm and the average width is 0.1 μm. Interestingly, it is found that the as-prepared θ-Al2O3 whiskers consist of twins with (100) plane as the twin surface, which is ascribed to the phase transformation from tetragonal phase (δ-Al2O3) to monoclinic phase (θ-Al2O3) during the annealing. Additionally, the specific surface area of θ-Al2O3 whiskers is measured to be 38.2 m2/g. Full article
(This article belongs to the Special Issue Extreme Environment Materials)
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11 pages, 3798 KiB  
Article
Fabrication of Porous SiC by Direct Selective Laser Sintering Effect of Boron Carbide
by Rongzhen Liu, Gong Chen, Yudi Qiu, Peng Chen, Yusheng Shi, Chunze Yan and Hongbin Tan
Metals 2021, 11(5), 737; https://doi.org/10.3390/met11050737 - 29 Apr 2021
Cited by 4 | Viewed by 1971
Abstract
Additive manufactured porous SiC is a promising material applied in extreme conditions characterised by high temperatures, chemical corrosion, and irradiation etc. However, residual Si’s existence deteriorates its performance and limits its application in harsh environments. In this study, B4C was introduced [...] Read more.
Additive manufactured porous SiC is a promising material applied in extreme conditions characterised by high temperatures, chemical corrosion, and irradiation etc. However, residual Si’s existence deteriorates its performance and limits its application in harsh environments. In this study, B4C was introduced into the selective laser sintering process of SiC, and its effects on forming ability, pore parameters, microstructure, and phases were investigated. The results showed that when B4C was added, the processing window was enlarged. The minimum energy density was reduced from 457 J/cm2 to 214 J/cm2 when the content of B4C reached 15 wt%. Microstructure orientation was enhanced, and the residual silicon content was decreased from 38 at.% to about 8 at.%. Small pores were turned into large pores with the increase of B4C addition. The findings indicate that the addition of B4C increases the amount of liquid phase during the laser sintering process of silicon carbide, improving the SiC struts’ density and reducing the residual silicon by reacting with it. Therefore, the addition of B4C will help improve the application performance of selected laser-sintered silicon carbide under extreme conditions. Full article
(This article belongs to the Special Issue Extreme Environment Materials)
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