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Recent Developments of Non-Ferrous Alloys: Processing, Microstructure and Properties (2nd...
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Recent Developments of Non-Ferrous Alloys: Processing, Microstructure and Properties (2nd Edition)

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 July 2025 | Viewed by 2188

Special Issue Editor

Prof. Dr. Hailin Yang

E-Mail Website
Guest Editor
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
Interests: Al alloy; high entropy alloy; advanced characterization; advanced powder metallurgy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the development of modern technology, the growing demand for advanced non-ferrous alloys (Aluminium, Copper, Nickel, Lead and Zinc, etc.) drives the development of the non-ferrous metallurgy industry. Moreover, non-ferrous alloys play a key role in many high-tech fields and promote the development and progress of industrial countries. Advanced non-ferrous alloys with excellent properties (high strength, excellent ductility, good wear resistance and corrosion resistance, etc.) are also widely used in various fields, such as automobiles, electronics, aviation, aerospace and biomedicine.

Thus, by covering all types of non-ferrous alloys, this Special Issue aims to provide better assessments of advanced non-ferrous alloys, including alloy design, processing methods, microstructure characterization, properties and application potentials.

Prof. Dr. Hailin Yang
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

  • advanced structural characterization
  • high strength/toughness alloys
  • advanced functional alloys
  • advanced manufacturing process

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Related Special Issue

Published Papers (3 papers)

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Research

17 pages, 6339 KiB  
Article
Influence of Copper Stoichiometric Composition and Compaction Method on Mechanical Properties of CuxSe Thermoelectric Materials
by Fani Stergioudi, Georgios Skordaris, Maria Pappa, Nikolaos Michailidis, Vasileios Pavlidis, Dimitrios Stathokostopoulos, Aikaterini Teknetzi, Lamprini Malletzidou, George Vourlias, Georgios Maliaris and Ioanna K. Sfampa
Metals 2025, 15(6), 640; https://doi.org/10.3390/met15060640 - 6 Jun 2025
Viewed by 192
Abstract
This study investigates the structural and mechanical properties of Cu–Se-based thermoelectric materials with varying Cu:Se stoichiometries (1.8, 1.9, and 2.0). Phase composition was examined using X-ray diffraction (XRD), revealing a transition from a mixed α/β-phase in Cu:Se = 2.0 to a fully cubic [...] Read more.
This study investigates the structural and mechanical properties of Cu–Se-based thermoelectric materials with varying Cu:Se stoichiometries (1.8, 1.9, and 2.0). Phase composition was examined using X-ray diffraction (XRD), revealing a transition from a mixed α/β-phase in Cu:Se = 2.0 to a fully cubic β-phase Cu2−xSe in Cu:Se = 1.8. Crystallite size analysis showed a reduction with increasing Cu content, which strongly influenced mechanical behavior. Vickers microhardness and nanoindentation tests were employed to assess hardness, elastic modulus, and elastic recovery. The Cu:Se = 2.0 sample exhibited the highest hardness but the lowest elastic recovery and elastic modulus from indentation, suggesting strong intragrain cohesion but limited elastic deformation due to fine grain structure. In contrast, the sub-stoichiometric Cu:Se = 1.8 phase displayed higher elastic modulus and recovery, possibly due to a more rigid Se sub-lattice and defect-mediated deformation mechanisms. Compression tests confirmed the higher bulk modulus in the Cu-deficient phase. Bending tests also showed that the Cu-deficient phase exhibited the highest bending modulus, further supporting its enhanced stiffness under elastic deformation. These results highlight the significant role of stoichiometry and crystallite structure in tuning the mechanical response of thermoelectric Cu–Se compounds, with implications for their durability and performance in practical applications. Full article
(This article belongs to the Special Issue Recent Developments of Non-Ferrous Alloys: Processing, Microstructure and Properties (2nd Edition))
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14 pages, 1991 KiB  
Article
Atomic Interaction Mechanism of Heterogeneous Nucleation in Mg-Al Alloys Achieved by Carbon Inoculation
by Aimin Zhang, Ying Zhu, Kai Tao and Zhiyuan Zhang
Metals 2025, 15(6), 594; https://doi.org/10.3390/met15060594 - 26 May 2025
Viewed by 216
Abstract
Theoretical calculations were performed to explore the heterogeneous nucleation mechanism of an Mg-Al alloy inoculated by a carbon-containing substance. The valence electron structure and cohesive energy of Al4C3 and Al2C2Mg crystals were calculated using the empirical [...] Read more.
Theoretical calculations were performed to explore the heterogeneous nucleation mechanism of an Mg-Al alloy inoculated by a carbon-containing substance. The valence electron structure and cohesive energy of Al4C3 and Al2C2Mg crystals were calculated using the empirical electron theory of solids and molecules (EET). The binding energy of Al1-C2 bonds in Al4C3 is about 140.6 kJ/mol with a lower number of equivalent bonds. Correspondingly, the binding energy of Al2-C2 bonds is about 129.6 kJ/mol, and the number of equivalent bonds is high. The weak combination of the Al1 and C2 atomic layers might lead to the breaking of Al4C3, and then the remaining strong skeleton of the Al2-C2 structure will facilitate the formation of Al2C2Mg. Based on the calculating results, the atomic interaction mechanism to account for the heterogeneous nucleation of α-Mg by C inoculation is elaborated, which also provides insights into the essence of the overheating process and the influence of Al and Mn elements on the refinement efficiency of Al2C2Mg. Full article
(This article belongs to the Special Issue Recent Developments of Non-Ferrous Alloys: Processing, Microstructure and Properties (2nd Edition))
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18 pages, 8676 KiB  
Article
Effects of In Situ TiB2 on the Microstructural Evolution, Mechanical Properties, and Friction Behavior of the Al-Si-Cu Alloys Processed by Laser Powder-Bed Fusion
by Zhongxue He, Jianying Wang, Mengzhen Zhu, Tao Wen, Feipeng Yang, Shouxun Ji, Jianming Zheng, Ling Shan and Hailin Yang
Metals 2024, 14(9), 1015; https://doi.org/10.3390/met14091015 - 5 Sep 2024
Cited by 1 | Viewed by 1237
Abstract
In the present study, the densification behavior, microstructural evolution, mechanical properties, and friction behavior of a TiB2/Al8SiCu composite and Al8SiCu alloy manufactured by laser powder-bed fusion (PBF-LB) were systematically investigated. The results confirm that the addition of in situ TiB2 [...] Read more.
In the present study, the densification behavior, microstructural evolution, mechanical properties, and friction behavior of a TiB2/Al8SiCu composite and Al8SiCu alloy manufactured by laser powder-bed fusion (PBF-LB) were systematically investigated. The results confirm that the addition of in situ TiB2 particles into Al8SiCu alloys reduce the volumetric energy density required for a high-density TiB2/Al8SiCu composite. The TiB2 particles promoted a transformation of columnar to equiaxed crystals and the formation of high-angle grain boundaries. The grains on the vertical direction of the PBF-LBed TiB2/Al8SiCu composite were much finer than those of the PBF-LBed Al8SiCu alloy. The addition of TiB2 promoted the grain refinement of the Al8SiCu alloy, of which the average grain size decreased from 15.31 μm to 7.34 μm. The yield strength (YS), ultimate tensile strength (UTS), and elongation (El) of the PBF-LBed Al8SiCu alloy were 296 ± 6 MPa, 517 ± 6 MPa, and 11.7 ± 1.0%, respectively. The PBF-LBed TiB2/Al8SiCu composite achieved a balance between strength and ductility with a yield strength of 328 ± 8 MPa, an ultimate tensile strength of 541 ± 3 MPa, and an elongation of 9.1 ± 0.7%. The increase in strength mainly resulted from grain boundary strengthening, dislocation strengthening, load-bearing strengthening, solid-solution strengthening, and Orowan strengthening, of which the dislocation strengthening and Orowan strengthening were critical. The enhanced hardness associated with the grain refinement and the formation of the in situ TiB2 particles also led to an enhanced tribological performance, of which reductions in the average friction coefficient from 0.655 to 0.580 and wear rate from 1.76 × 10−3 mm3/Nm to 1.38 × 10−3 mm3/Nm were found. Full article
(This article belongs to the Special Issue Recent Developments of Non-Ferrous Alloys: Processing, Microstructure and Properties (2nd Edition))
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