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Nanocrystalline Materials: Microstructure, Soft Magnetism and Mechanical Properties
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Nanocrystalline Materials: Microstructure, Soft Magnetism and Mechanical Properties

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

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 3150

Special Issue Editor

Prof. Dr. Joan-Josep Suñol

E-Mail Website
Guest Editor
Department of Physics, University of Girona, Campus Montilivi s/n, 17003 Girona, Spain
Interests: Powder Metallurgy; Structural Analysis; Thermal Analysis; Mechanical Alloying; Nanocrystalline
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanocrystalline materials include nanoparticles, 1D and 2D nanomaterials as well as nanostructured 3D materials (bulk, composites). It is well known that magnetic properties are influenced by the microstructure. In nanocrystalline materials, the optimization of the crystals’ dimensions allows the design of materials with high magnetization of saturation, high polarization, the largest permeability, minimal hysteresis, and low coercivity. Furthermore, the controlled addition of magnetic and non-magnetic elements shifts functional magnetic behavior and the working temperature interval. The production of these magnetic materials with the desired nanocrystalline microstructure is a field of continuous research.

Articles related to nanomagnetism models, simulation, and experimental development are expected. Thus, theoretical and technological manuscripts are welcomed. The applications involve static, low-frequency, and high-frequency sensors and devices: transformer cores, relays, pole pieces, magnetic shielding, antennas, motors, generation, magnetic amplifiers, choke coils, and so on.

Prof. Dr. Joan-Josep Suñol
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

  • nanocrystalline
  • soft magnetic
  • nanostructured
  • nanoparticles
  • magnetic applications
  • simulation
  • nanomagnetism
  • microstructure
  • mechanical properties

Published Papers (2 papers)

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Research

13 pages, 1424 KiB  
Article
Grain Size-Dependent Thermal Expansion of Nanocrystalline Metals
by Pär A. T. Olsson, Ibrahim Awala, Jacob Holmberg-Kasa, Andreas M. Krause, Mattias Tidefelt, Oscar Vigstrand and Denis Music
Materials 2023, 16(14), 5032; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16145032 - 16 Jul 2023
Viewed by 1222
Abstract
In the present work, we have used classical molecular dynamics and quantum mechanical density functional theory modeling to investigate the grain size-dependent thermal expansion coefficient (CTE) of nanocrystalline Cu. We find that the CTE increases by up to 20% with a gradually decreasing [...] Read more.
In the present work, we have used classical molecular dynamics and quantum mechanical density functional theory modeling to investigate the grain size-dependent thermal expansion coefficient (CTE) of nanocrystalline Cu. We find that the CTE increases by up to 20% with a gradually decreasing grain size. This behavior emerges as a result of the increased population of occupied anti-bonding states and bond order variation in the grain boundary regions, which contribute to the reduced resistance against thermally-induced bond stretching and dictate the thermal expansion behavior in the small grain size limit. As a part of the present work, we have established a procedure to produce ab initio thermal expansion maps that can be used for the prediction of the grain size-dependent CTE. This can serve as a modeling tool, e.g., to explore the impact of grain boundary impurity segregation on the CTE. Full article
(This article belongs to the Special Issue Nanocrystalline Materials: Microstructure, Soft Magnetism and Mechanical Properties)
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12 pages, 3252 KiB  
Article
Structural, Thermal and Magnetic Analysis of Two Fe-X-B (X = Nb, NiZr) Nanocrystalline Alloy
by Kaouther Zaara, Jason Daza, Wael Ben Mbarek and Joan-Josep Suñol
Materials 2023, 16(1), 155; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16010155 - 24 Dec 2022
Cited by 2 | Viewed by 1211
Abstract
High-energy ball milling was used to produce two Fe-X-B (X = Nb, NiZr) nanocrystalline alloys. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM) were used to analyze the microstructure, thermal, and magnetic characteristics of the milled powders, the agglomerated [...] Read more.
High-energy ball milling was used to produce two Fe-X-B (X = Nb, NiZr) nanocrystalline alloys. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM) were used to analyze the microstructure, thermal, and magnetic characteristics of the milled powders, the agglomerated particles (also generated during the milling process), and the compacted specimens of both alloys. The main crystallographic phase is always a bcc Fe-rich solid solution; whereas a minor Nb(B) phase is detected on powders and agglomerated particles in the Fe80Nb8B12 alloy. The crystalline size of the Fe80(NiZr)8B12 alloy is between 11 and 14 nm, whereas in the Fe80Nb8B12 alloy, it ranges between 8 and 12 nm. Microstrain and dislocation density are higher in agglomerated samples for both alloys than in milled powders. Thermal analysis detects structural relaxation and crystal growth exothermic processes with high dispersion in the temperature intervals and in the calculated apparent activation energy of the main crystallization process. Regarding magnetic behavior, the coercivity values of all powdered-agglomerated specimens were around 800 A/m. The coercivity is higher in compacted sample, but controlled annealing favors enhanced soft behavior. Full article
(This article belongs to the Special Issue Nanocrystalline Materials: Microstructure, Soft Magnetism and Mechanical Properties)
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