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Metals
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Powder Metallurgy of Metals and Alloys
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Powder Metallurgy of Metals and Alloys

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

Deadline for manuscript submissions: closed (31 March 2025) | Viewed by 1559

Special Issue Editor

Dr. Deyin Zhang

E-Mail Website
Guest Editor
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
Interests: powder metallurgy

Special Issue Information

Dear Colleagues,

Powder metallurgy involves the production of powders, compaction and shaping of powders, and sintering as well as post-sintering processes to fabricate ready-to-use components. Due to its flexibility, environmental friendliness, and excellent process control, this processing technology is most suitable for producing high-density and high strength-to-weight components, which are widely sought after by researchers and have become a hot topic in research.

We invite articles and reviews on the latest advances in powder metallurgy technology from both academic and industry researchers for this Special Issue.

Dr. Deyin Zhang
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

  • powder metallurgy
  • functional powder material
  • dispersion-strengthened material
  • metal material
  • solution combustion synthesis
  • soft magnetic materials

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Published Papers (3 papers)

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Research

18 pages, 7396 KiB  
Article
Characterization of Porosity and Copper Infiltration Mechanism in Sintered Steel via Computed Tomography
by Pengcheng Lin, Linshan Wang, Shuanghua Liang, Xuebing Liang, Qiang Hu, Limin Wang and Xuanhui Qu
Metals 2025, 15(6), 635; https://doi.org/10.3390/met15060635 - 5 Jun 2025
Abstract
This study employs CT non-destructive detection to quantitatively analyze the pore structure of sintered steel and investigate copper infiltration mechanisms. As density increases from 6.55 to 6.95 g/cm3, pore characteristics exhibit significant changes: pore quantity initially increases then decreases, while average [...] Read more.
This study employs CT non-destructive detection to quantitatively analyze the pore structure of sintered steel and investigate copper infiltration mechanisms. As density increases from 6.55 to 6.95 g/cm3, pore characteristics exhibit significant changes: pore quantity initially increases then decreases, while average pore size monotonically reduces from 35.7 to 17.2 μm. Copper infiltration dramatically transforms the material’s porosity, characterized by reduced pore count, decreased distribution uniformity, increased closed pore proportion, and morphological regularization. The infiltration process demonstrates selective filling, primarily governed by pore connectivity, size effect, and capillary forces. Molten copper preferentially penetrates high-connectivity networks, prioritizing irregular angular regions. Medium-sized pores (10.52–23.76 μm) with optimal connectivity are predominantly filled. At 6.75 g/cm3, an optimal balance between pore quantity, size, and connectivity facilitates uniform copper infiltration. Full article
(This article belongs to the Special Issue Powder Metallurgy of Metals and Alloys)
23 pages, 10069 KiB  
Article
Microstructural Evolution, Strengthening Mechanisms, and Fracture Behavior of Aluminum Composites Reinforced with Graphene Nanoplatelets and In Situ–Formed Nano-Carbides
by Rumyana Lazarova, Lubomir Anestiev, Yana Mourdjeva, Kateryna Valuiska and Veselin Petkov
Metals 2025, 15(3), 285; https://doi.org/10.3390/met15030285 - 5 Mar 2025
Viewed by 623
Abstract
The microstructure and mechanical properties of GNP-reinforced aluminum composites obtained by powder metallurgy and hot extrusion (at 400 °C, 500 °C, and annealing at 3 h at 610 °C), were investigated. It was found that: (i) depending on the processing applied, the composites [...] Read more.
The microstructure and mechanical properties of GNP-reinforced aluminum composites obtained by powder metallurgy and hot extrusion (at 400 °C, 500 °C, and annealing at 3 h at 610 °C), were investigated. It was found that: (i) depending on the processing applied, the composites showed an increase in yield strength (YS) and ultimate strength (US) of up to 283%, and 78%, respectively; (ii) depending on the size of the ex situ GNP and in situ Al4C3 reinforcements, two fracture mechanisms are observed: ductile and brittle–ductile; (iii) annealing for 3 h at 610 °C did not improve the mechanical properties; (iv) the plot of YS vs. the volume fraction of the GNP introduced showed a peculiar pattern not been reported so far. Theoretical analysis of the results showed: (1) the major contributor to the YS increase is the Hall–Petch mechanism; (2) the reinforcements contribution to YS, complements that of Hall–Petch; (3) the main contributor to the composite strength is GNP; (4) a critical size of the reinforcement exists, 1.43 nm, at which the YS is maximal, 260 MPa; (5) the increase in the processing temperature and time leads to Ostwald ripening and increase of Al4C3 size and deterioration of mechanical properties. Full article
(This article belongs to the Special Issue Powder Metallurgy of Metals and Alloys)
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16 pages, 4063 KiB  
Article
Kinetics of Oxidation of Binary Ti-Cu Alloys in the 600–800 °C Temperature Range
by Fatemah Alqattan, Fei Yang and Leandro Bolzoni
Metals 2025, 15(2), 222; https://doi.org/10.3390/met15020222 - 18 Feb 2025
Viewed by 600
Abstract
The oxidation behaviour of Ti alloys is a crucial aspect for structural components operating at high service temperature. The aim of this study is to identify the oxidation kinetics and mechanism of binary Ti-Cu alloys with a progressively higher amount of Cu with [...] Read more.
The oxidation behaviour of Ti alloys is a crucial aspect for structural components operating at high service temperature. The aim of this study is to identify the oxidation kinetics and mechanism of binary Ti-Cu alloys with a progressively higher amount of Cu with the alloys having a α + β lamellar structure. It is found that all the alloys followed a non-ideal (i.e., n ≠ 2) parabolic relationship, as controlled by anionic oxygen diffusion, with a distinct effect from both oxidation temperature and alloy chemistry. Specifically, faster oxidation kinetics are found both at higher temperatures and for higher Cu contents, resulting in the formation of thicker oxide scale layers. The oxidation mechanism primarily entails the formation of the stable TiO2 rutile polymorph. However, transitions through metastable phases (e.g., anatase) and texturing of rutile are also revealed as dictated by the composition of the alloy at specific oxidation temperature/time pairs. Full article
(This article belongs to the Special Issue Powder Metallurgy of Metals and Alloys)
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