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Metals
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Advanced Metal Matrix Nanocomposites
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Advanced Metal Matrix Nanocomposites

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Matrix Composites".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 8972

Special Issue Editors

Prof. Dr. Alexander Vorozhtsov

E-Mail Website
Guest Editor
Laboratory of High Energetic and Special Materials, Tomsk State University, Tomsk, Russia
Interests: high-energy materials; high-strength light alloys; metal matrix nanocomposites
Special Issues, Collections and Topics in MDPI journals
Dr. Anton Khrustalyov

E-Mail Website
Guest Editor
Faculty of Physics and Engineering, National Research Tomsk State University, 36 Lenin Ave., 634050 Tomsk, Russia
Interests: light alloy; metal matrix composites; nanoparticles; solidification

Special Issue Information

Dear Colleagues,

Light alloys (for instance, aluminum and magnesium) that are traditionally used in the field of advanced metal matrix nanocomposites have reached the limit of their properties and new lightweight materials, such as metal matrix composites (MMCs) and metal matrix nanocomposites (MMNCs), are currently under development. However, the process of manufacturing MMCs and MMNCs faces a number of challenges. The first challenge that is evident is the selection of a technological route, for example, powder metallurgy, liquid-metal processing, and preform impregnation. The second is the selection of reinforcing phases and their morphology, such as particles or fibers. The third is the choice of the means the by which to improve the introduction and dispersion of the reinforcements inside the matrix. This Special Issue addresses the areas of research concerned with the physical, mechanical, and functional properties of MMCs and MMNCs, including those reinforced with particles and fibers. Researchers are invited to submit articles that explore alternative directions in the research field for obtaining and investigating advanced metal matrix nanocomposites.

Prof. Dr. Alexander Vorozhtsov
Dr. Anton Khrustalyov
Guest Editors

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

  • aluminum
  • magnesium
  • hardening
  • particles
  • fibers
  • structure
  • fracture
  • properties

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Published Papers (4 papers)

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Research

15 pages, 45733 KiB  
Article
Production and Characterization of Aluminum Reinforced with SiC Nanoparticles
by Francisca Rocha and Sónia Simões
Metals 2023, 13(9), 1626; https://doi.org/10.3390/met13091626 - 20 Sep 2023
Cited by 4 | Viewed by 2052
Abstract
Aluminum matrix nanocomposites have been the subject of much attention due to their extraordinary mechanical properties and thermal stability. This research focuses on producing and characterizing an aluminum matrix reinforced with silicon carbide (SiC) nanometric particles. The conventional powder metallurgy route was used [...] Read more.
Aluminum matrix nanocomposites have been the subject of much attention due to their extraordinary mechanical properties and thermal stability. This research focuses on producing and characterizing an aluminum matrix reinforced with silicon carbide (SiC) nanometric particles. The conventional powder metallurgy route was used to produce the nanocomposites, and the dispersion and mixing process was carried out by ultrasonication. The conditions of the dispersion and the volume fraction of the SiC were evaluated in the production of the nanocomposites. Microstructural characterization was carried out using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). Mechanical characterization was carried out using hardness and tensile tests. The dispersion agent was investigated, and isopropanol leads to better dispersion with fewer agglomerates. Increasing the volume fraction of the reinforcement improves the hardness of the nanocomposites. However, greater agglomeration of the reinforcement is observed for larger volume fractions. The greatest increase in hardness (77% increase compared to the hardness of the Al matrix) is obtained with 1.0 vol. % of SiC, corresponding to the sample with the best dispersion. The mechanical characterization through tensile tests attests to the effect of the reinforcement on the Al matrix. The main strengthening mechanisms identified were the load transfer, the texture hardening, Orowan strengthening, and the increase in the density of dislocations in the nanocomposites. Full article
(This article belongs to the Special Issue Advanced Metal Matrix Nanocomposites)
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14 pages, 4074 KiB  
Article
Influence of Graphene and Silver Addition on Aluminum’s Thermal Conductivity and Mechanical Properties Produced by the Powder Metallurgy Technique
by Essam B. Moustafa, Salem S. Abdel Aziz, Mohammed A. Taha and Abdel-Halim Saber
Metals 2023, 13(5), 836; https://doi.org/10.3390/met13050836 - 24 Apr 2023
Cited by 16 | Viewed by 2142
Abstract
The high heat dissipation of high-power electronic equipment has become a major cause of damage, especially the central processing units (CPUs) of computers and other electronic devices. Accordingly, this research aims to improve the thermal conductivity as well as the mechanical properties of [...] Read more.
The high heat dissipation of high-power electronic equipment has become a major cause of damage, especially the central processing units (CPUs) of computers and other electronic devices. Accordingly, this research aims to improve the thermal conductivity as well as the mechanical properties of aluminum (Al) by mono and hybrid reinforcements of silver (Ag) and graphene (G) so that they can be used for heat dissipation. The structures of the prepared powders were investigated using the X-ray diffraction (XRD) technique. Furthermore, the sintered composites’ microstructure, density, thermal conductivity, mechanical properties, and electrical conductivity were investigated. The results showed that adding Ag percentages led to forming the Ag2Al phase while adding graphene decreased the crystallite of the milled powder. The SEM results showed that the samples had high densification, which was slightly reduced with increasing percentages of reinforcements. Importantly, Al’s thermal conductivity and mechanical properties were significantly improved due to the addition of Ag and G reinforcements with a slight decrease in electrical conductivity. The highest thermal conductivity was observed a 278.86 W/mK in the sample containing 5 vol.% of Ag and 2.5 vol.% of G, which was improved by about 20.6%. In contrast, the highest microhardness and Young’s modulus were 39.19 HV and 71.67 GPa, which resulted in an improvement of about 30.7 and 17.8% for the sample containing 2.5 vol.% of Ag and 5 vol.% of G when compared to the Al matrix. Based on these promising findings, it is possible to infer that the objective of this study was effectively attained and that the created composites are appropriate for such applications. Full article
(This article belongs to the Special Issue Advanced Metal Matrix Nanocomposites)
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15 pages, 6571 KiB  
Article
Understanding the Influencing Mechanism of CNTs on the Microstructures and Wear Characterization of Semi-Solid Stir Casting Al-Cu-Mg-Si Alloys
by Li Wang, Zhenlin Zhang, Yajun Luo, Ying Xiao, Fengliang Tan and Kecai Liu
Metals 2022, 12(12), 2171; https://doi.org/10.3390/met12122171 - 16 Dec 2022
Cited by 4 | Viewed by 2087
Abstract
In this study, CNTs-reinforced Al-Cu-Mg-Si nanocomposites were successfully fabricated by high-energy ball milling (HEBM) combined with semi-solid stir casting. Then, the composites were subjected to hot extrusion. The Microstructure and Phase analysis of the CNT/Al-Cu-Mg-Si composites were characterized by an Optical microscope, Scanning [...] Read more.
In this study, CNTs-reinforced Al-Cu-Mg-Si nanocomposites were successfully fabricated by high-energy ball milling (HEBM) combined with semi-solid stir casting. Then, the composites were subjected to hot extrusion. The Microstructure and Phase analysis of the CNT/Al-Cu-Mg-Si composites were characterized by an Optical microscope, Scanning Electron Microscope (SEM), and XRD. Additionally, density, hardness, and wear were measured. The results revealed that the addition of CNTs effectively inhibited the growth of α-Al grains, and the grains were dramatically refined. Additionally, the dynamic recrystallization degree of the composite extruded rod gradually increased from 1.3% to 68.4%, with the content of CNTs from 0 wt% to 3.0 wt%. The hardness values of the composite increased with an increase in CNTs. Moreover, the friction factor and wear rate of the composites first decreased and then increased as the content of CNTs increased. When 1.5CNTs were added, the friction coefficient (COF) and wear rate of composites reached the minimum of 0.3577 and 3.42 mg/km, which were reduced by 30.09% and 73.03% compared with Al-Cu-Mg-Si alloy, respectively. Full article
(This article belongs to the Special Issue Advanced Metal Matrix Nanocomposites)
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11 pages, 5084 KiB  
Article
Effect of TiN Coating on the Structure, Mechanical Properties and Fracture of the Mg-Ca-Zn Alloy
by Anton Khrustalyov, Alexander Monogenov, Gulsharat Baigonakova, Anastasia Akhmadieva, Ekaterina Marchenko and Alexander Vorozhtsov
Metals 2022, 12(12), 2140; https://doi.org/10.3390/met12122140 - 13 Dec 2022
Cited by 3 | Viewed by 2011
Abstract
This paper establishes the optimal thickness of TiN ceramic coating on the surface of Mg-Ca-Zn alloy using optical and scanning microscopy methods. X-ray diffraction analysis and tests on its mechanical properties showed that deposition of coating with a thickness of not less than [...] Read more.
This paper establishes the optimal thickness of TiN ceramic coating on the surface of Mg-Ca-Zn alloy using optical and scanning microscopy methods. X-ray diffraction analysis and tests on its mechanical properties showed that deposition of coating with a thickness of not less than 1 μm on the alloy causes a uniform distribution of the TiN phase over the magnesium alloy surface. The TiN coating also contributes to simultaneous increases in the yield strength, tensile strength, ductility and microhardness of the Mg-Ca-Zn alloy. Full article
(This article belongs to the Special Issue Advanced Metal Matrix Nanocomposites)
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