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Amorphous and Nanocrystalline Materials: Characterizations, Technologies and Applications
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Amorphous and Nanocrystalline Materials: Characterizations, Technologies and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 4040

Special Issue Editor

Prof. Dr. Weimin Wang

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Shandong University, Jinan 250061, China
Interests: metallic glasses; nano metallic alloys; medium/high-entropy alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Amorphous and nanocrystalline materials have a unique microstructure: long-range atomic disorder and short-range order. Hence, they are thermodynamically metastable. Amorphous materials are often formed in special conditions and have special functional properties, such high elastic moduli and strength, high magnetization, low coercivity, and high catalytic ability. Nanocrystalline materials are closely related to amorphous materials in terms of processing and service conditions. Their characterization, technologies, and applications have long been of interest to metallurgists, physicists, chemists, materials scientists, and engineers.

Prof. Dr. Weimin Wang
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

  • metallic glasses
  • nanocrystalline materials
  • microstructure
  • magnetization
  • pollution degradation
  • mechanical properties
  • rapid solidification
  • materials computation

Published Papers (2 papers)

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Research

14 pages, 4935 KiB  
Article
Centrifugal Atomization of Glass-Forming Alloy Al86Ni8Y4.5La1.5
by Jordi Pijuan, Sasha Alejandra Cegarra, Sergi Dosta, Vicente Albaladejo-Fuentes and María Dolores Riera
Materials 2022, 15(22), 8159; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15228159 - 17 Nov 2022
Cited by 4 | Viewed by 1602
Abstract
Centrifugal atomization is a rapid solidification technique for producing metal powders. However, its wide application has been limited to the production of common metal powders and their corresponding alloys. Therefore, there is a lack of research on the production of novel materials such [...] Read more.
Centrifugal atomization is a rapid solidification technique for producing metal powders. However, its wide application has been limited to the production of common metal powders and their corresponding alloys. Therefore, there is a lack of research on the production of novel materials such as metallic glasses using this technology. In this paper, aluminum-based glassy powders (Al86Ni8Y4.5La1.5) were produced by centrifugal atomization. The effects of disk speed, atomization gas, and particle size on the cooling rate and the final microstructure of the resulting powder were investigated. The powders were characterized using SEM and XRD, and the amorphous fractions of the atomized powder samples were quantified through DSC analysis. A theoretical model was developed to evaluate the thermal evolution of the atomized droplets and to calculate their cooling rate. The average cooling rate experienced by the centrifugally atomized powder was calculated to be approximately 7 × 105 Ks−1 for particle sizes of 32.5 μm atomized at 40,000 rpm in a helium atmosphere. Amorphous fractions from 60% to 70% were obtained in particles with sizes of up to 125 μm in the most favorable atomization conditions. Full article
(This article belongs to the Special Issue Amorphous and Nanocrystalline Materials: Characterizations, Technologies and Applications)
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16 pages, 11667 KiB  
Article
Fe-Based Amorphous Magnetic Powder Cores with Low Core Loss Fabricated by Novel Gas–Water Combined Atomization Powders
by Jiaqi Liu, Yannan Dong, Zhengqu Zhu, Huan Zhao, Jing Pang, Pu Wang and Jiaquan Zhang
Materials 2022, 15(18), 6296; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15186296 - 10 Sep 2022
Cited by 15 | Viewed by 1902
Abstract
FeSiBCCr amorphous powders were produced by a novel gas–water combined atomization process, and the corresponding MPCs (magnetic powder cores) were subsequently fabricated by phosphating treatment (0.4~1.6 wt.%), cold pressing (550~2350 MPa), and annealing (423~773 K), respectively. The results showed that the powders had [...] Read more.
FeSiBCCr amorphous powders were produced by a novel gas–water combined atomization process, and the corresponding MPCs (magnetic powder cores) were subsequently fabricated by phosphating treatment (0.4~1.6 wt.%), cold pressing (550~2350 MPa), and annealing (423~773 K), respectively. The results showed that the powders had high circularity, excellent thermal stability (ΔT = 59 K), and high saturation magnetization (0.83 T), which could provide raw powders for high-performance MPCs. With increasing phosphoric acid concentrations, despite the increase in DC-bias%, the uniformity of the insulation layers deteriorated, which led to a decrease in permeability and an increase in core loss. With increasing compaction pressures, the core loss increased continuously, and the permeability and DC-bias% first increased and then decreased. When annealing below the crystallization temperature, with increasing annealing temperatures, the permeability increased, and the core loss and DC-bias% decreased continuously. Under the optimized process of 0.4 wt.% phosphating concentration, 550 MPa pressure, and 773 K annealing temperature, the MPCs had a permeability of 21.54 ± 1.21, DC-bias% of 90.3 ± 0.2, and a core loss (Bm = 50 mT, f = 100 kHz) of 103.0 ± 26.3 mW cm−3. The MPCs had excellent high-frequency low-loss characteristics and showed great application potential under the development trends of high current, high power, and high frequency of electronic components. Full article
(This article belongs to the Special Issue Amorphous and Nanocrystalline Materials: Characterizations, Technologies and Applications)
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