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Metals
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Metal-Matrix Composites Fabricated by Powder Metallurgy
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Metal-Matrix Composites Fabricated by Powder Metallurgy

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Powder Metallurgy".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 8155

Special Issue Editor

Prof. Dr. Se Eun Shin

E-Mail Website
Guest Editor
Sunchon National University, Department of Materials Science and Metallurgical Engineering, Suncheon, South Korea
Interests: nanocomposites; microstructural evolution; materials design; mechanical properties; powder metallurgy

Special Issue Information

Dear Colleagues,

Metal matrix composites (MMCs) have emerged as a result of constant interest due to their extraordinary properties and, therefore, potential in structural and biomedical applications. In recent times, additive manufacturing has been rapidly expanding in use as a manufacturing process  of the powder metallurgy route. Hence, MMCs have been fabricated by powder metallurgy, including from the fabrication of powder (e.g., ball-milling, arc-melting, etc.), hot-processing (e.g., hot-pressing, spark-plasma sintering, etc.), and additive manufacturing (e.g., powder bed fusion, direct electron deposition, etc.). Accordingly, this Special Issue of Metals aims to provide a platform for researchers to showcase their work in the areas of synthesis, characterization, modeling, and applications of MMCs, and we welcome reviews and articles on the topic of MMCs fabricated by powder metallurgy and their applications.

Prof. Dr. Se Eun Shin
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

  • nanocomposites
  • microstructural evolution
  • materials design
  • mechanical properties
  • functional properties
  • powder metallurgy
  • additive manufacturing

Published Papers (3 papers)

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Research

13 pages, 3422 KiB  
Article
The Interface and Fabrication Process of Diamond/Cu Composites with Nanocoated Diamond for Heat Sink Applications
by Yaqiang Li, Hongyu Zhou, Chunjing Wu, Zheng Yin, Chang Liu, Ying Huang, Junyou Liu and Zhongliang Shi
Metals 2021, 11(2), 196; https://doi.org/10.3390/met11020196 - 22 Jan 2021
Cited by 8 | Viewed by 2547
Abstract
The coefficients of thermal expansion (CTE) and thermal conductivity (TC) are important for heat sink applications, as they can minimize stress between heat sink substrates and chips and prevent failure from thermal accumulation in electronics. We investigated the interface behavior and manufacturing of [...] Read more.
The coefficients of thermal expansion (CTE) and thermal conductivity (TC) are important for heat sink applications, as they can minimize stress between heat sink substrates and chips and prevent failure from thermal accumulation in electronics. We investigated the interface behavior and manufacturing of diamond/Cu composites and found that they have much lower TCs than copper due to their low densities. Most defects, such as cavities, form around diamond particles, substantially decreasing the high TC of diamond reinforcements. However, the measurement results for the Cu-coated diamond/Cu composites are unsatisfactory because the nanosized copper layer on the diamond surface grew and spheroidized at elevated sintering temperatures. Realizing ideal interfacial bonding between a copper matrix and diamond particles is difficult. The TC of the 40 vol.% Ti-coated diamond/Cu composite is 475.01 W m−1 K−1, much higher than that of diamond/Cu and Cu-coated diamond/Cu composites under equivalent manufacturing conditions. The minimally grown titanium layer retained its nanosized and was consistent with the sintering temperature. Depositing a nanosized titanium layer on a diamond surface will strengthen interfacial bonding through interface reactions among the copper matrix, nanosized titanium layer and diamond particles, reducing the interfacial thermal resistance and exploiting the high TC of diamond particles, even if defects from powder metallurgy remain. These results provide an important experimental and theoretical basis for manufacturing diamond/Cu composites for heat sink applications. Full article
(This article belongs to the Special Issue Metal-Matrix Composites Fabricated by Powder Metallurgy)
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11 pages, 5824 KiB  
Article
Fe-6.5 wt%Si Powder Cores with Low Core Loss by Optimizing Particle Size Distribution
by JianJun Huang, Lixin Jiao, Yu Yang, Yaqiang Dong, Yiqun Zhang, Liang Chang, Mengji Gong, Jiawei Li, Aina He and Xinmin Wang
Metals 2020, 10(12), 1699; https://doi.org/10.3390/met10121699 - 21 Dec 2020
Cited by 12 | Viewed by 2241
Abstract
The effect of different particle size distribution of Fe-6.5 wt%Si powder on the microstructure and soft magnetic properties of the corresponding soft magnetic powder cores (SMPCs) was investigated. By optimizing particle size distribution, the density of SMPCs increased and the total core loss [...] Read more.
The effect of different particle size distribution of Fe-6.5 wt%Si powder on the microstructure and soft magnetic properties of the corresponding soft magnetic powder cores (SMPCs) was investigated. By optimizing particle size distribution, the density of SMPCs increased and the total core loss significantly decreased. According to the result of loss separation, density of SMPCs is inversely proportional to hysteresis loss, while with increasing the content of the fine particles, the eddy current loss significantly decreased. It was found that with magnetic powder of particle size-grading as 10%, 10%, 60%, and 20% for particles with size between −75 to +38, −38 to +23, −23 to +13, and −13 μm, respectively, the Fe-6.5 wt%Si SMPCs exhibit optimal comprehensive magnetic performances with the effective permeability of about 60, the percent permeability at 100 Oe is up to 70%, and the lowest core loss of 553 mW/cm3. Full article
(This article belongs to the Special Issue Metal-Matrix Composites Fabricated by Powder Metallurgy)
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12 pages, 5448 KiB  
Article
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering
by Wei Wang, Haixiong Zhou, Qingjuan Wang, Baojia Wei, Shewei Xin and Yuan Gao
Metals 2020, 10(6), 737; https://doi.org/10.3390/met10060737 - 02 Jun 2020
Cited by 11 | Viewed by 2589
Abstract
Ti-6Al-4V alloy (TC4) with different concentrations of graphene nanoplatelets (GNPs) were fabricated by ball milling and spark plasma sintering (SPS). Microstructure characteristics of the composites were characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), and Raman. Microhardness and the compressive mechanical properties [...] Read more.
Ti-6Al-4V alloy (TC4) with different concentrations of graphene nanoplatelets (GNPs) were fabricated by ball milling and spark plasma sintering (SPS). Microstructure characteristics of the composites were characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), and Raman. Microhardness and the compressive mechanical properties were also investigated. Experimental results showed that in the process of SPS, most of the GNPs were still retained at high pressure and temperature, and a new phase of TiC was presented due to the in-situ reaction between TiC and GNPs. Also, the strength of the composites was depended on the concentration of GNPs in TC4 matrix. Consequently, the composite with 0.8 wt. % GNPs was increased 18% in microhardness. The maximum yield strength and ductility of the composite were increased by 22.2% and 43.2%, respectively. The strengthening mechanism of the composites was further discussed, and the Orowan strengthening mechanism was the main strengthening factor. Full article
(This article belongs to the Special Issue Metal-Matrix Composites Fabricated by Powder Metallurgy)
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