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Metals
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Advanced Metallic Foams
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Advanced Metallic Foams

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 5403

Special Issue Editors

Dr. Emanoil Linul

E-Mail Website
Guest Editor
Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 300222 Timisoara, Romania
Interests: lightweight composite materials; porous and cellular materials; advanced metallic foams; syntactic foams; mechanical characterization; microstructural analysis; structure–property relationships; failure mechanisms
Special Issues, Collections and Topics in MDPI journals
Dr. Nima Movahedi

E-Mail Website
Guest Editor
Centre for Mass and Thermal Transport in Engineering Materials, School of Engineering, The University of Newcastle, Callaghan, NSW, Australiaewcastle, Callaghan, NSW, Australia
Interests: metallic foams; porous materials; composite materials; functionally graded structures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is our pleasure to invite you to submit a manuscript to the forthcoming Special Issue “Advanced Metallic Forms” of the international peer-reviewed open access Metals journal.

Metallic foams have become the most promising class of advanced materials due to their combination of unique properties such as high energy absorption and damping capacities, as well as their high stiffness-to-weight ratio. Advanced metallic foams consist of 3D networks of stochastically distributed pores that make them lightweight materials with improved crashworthiness performance. Due to their porous structures and lower density compared to most other advanced materials, they are mostly considered as energy absorbers in structural and automotive industries. However, other sectors, such as chemical and medicine, benefit from their unique characteristics. All these features make advanced metallic foams the ideal candidates for replacing high-density materials (e.g., steel, aluminum, etc.).

This Special Issue represents a good opportunity to disseminate different aspects related to recent developments in advanced metallic foams. Research and review articles, along with short communications, are invited for consideration in this Special Issue. If you have any questions or need further information about this Special Issue, please feel free to contact us.

Dr. Emanoil Linul
Mr. Nima Movahedi
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

  • Advanced metallic foams
  • Manufacturing methods
  • Mechanical properties
  • Experimental characterization
  • Numerical investigations
  • Microstructural analysis
  • Failure mechanisms

Published Papers (4 papers)

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Research

16 pages, 8044 KiB  
Article
Characteristics of Pore Morphology in Aluminum Alloy Foams Fabricated by Semi-Solid Route among Multiple Experimental Runs
by Satomi Takamatsu, Takahiro Arai, Akane Sayama and Shinsuke Suzuki
Metals 2023, 13(10), 1654; https://doi.org/10.3390/met13101654 - 27 Sep 2023
Cited by 1 | Viewed by 702
Abstract
A semi-solid route is expected to be a fabrication method that can fabricate aluminum alloy foams with a variety of mechanical properties, but the allowance fluctuation of the fabrication conditions of aluminum alloy foams with high reproducibility is not clear. The objective of [...] Read more.
A semi-solid route is expected to be a fabrication method that can fabricate aluminum alloy foams with a variety of mechanical properties, but the allowance fluctuation of the fabrication conditions of aluminum alloy foams with high reproducibility is not clear. The objective of this study was to reveal the allowance fluctuation between the setting temperature and the actual temperature of the melt to fabricate stable foams, having pores with small pores and high circularity, and the influence of the increasing volume fraction of the solid on the pore morphology. Al-Si alloy foams were fabricated five times by adding a blowing agent into a semi-solid slurry under the same setting fabrication conditions, such as the temperature and concentration of oxygen in the atmosphere. The results of small relative standard deviations of pore diameter and circularity indicated that the conducted fabrication process had high reproducibility, even if the volume fraction of the solid changed in a range of 5%. When the volume fraction of the solid exceeds the minimal fraction of primary crystals for prevention of drainage, the clogging effect works more efficiently because the ratio of clogged cell walls increases. Additionally, the preferred range of the volume fraction of the solid for the fabrication of stable foam was revealed to be around 15% to 35%. Full article
(This article belongs to the Special Issue Advanced Metallic Foams)
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18 pages, 9275 KiB  
Article
Influence of Melt Infiltration Parameters on Structural and Mechanical Properties of Al-4.3wt.%Cu-EP Syntactic Foam
by Behzad Niroumand and Amir Jazini Dorcheh
Metals 2023, 13(8), 1345; https://doi.org/10.3390/met13081345 - 27 Jul 2023
Viewed by 730
Abstract
The present research concerns fabrication of Al-4.3wt.%Cu metal syntactic foams using expanded perlite particles (EPPs). A gas pressure infiltration technique was employed to fabricate the aluminium syntactic foams under different infiltration temperatures and pressures. Ambient air pressure and 750 °C were identified as [...] Read more.
The present research concerns fabrication of Al-4.3wt.%Cu metal syntactic foams using expanded perlite particles (EPPs). A gas pressure infiltration technique was employed to fabricate the aluminium syntactic foams under different infiltration temperatures and pressures. Ambient air pressure and 750 °C were identified as the favoured processing conditions for full infiltration of the melt. The average density and EP volume percentage of the fabricated foams were measured to be about 1.55 g/cm3 and 50.3%, respectively. Melt infiltration is believed to be mainly controlled by the breakage of the aluminium oxide layer on the melt surface and melt viscosity. Preferential infiltration of the melt between the mould wall and the EP particles bed complemented by radial melt infiltration toward the centre of the samples was identified. The effects of EP particles on growth of the nucleated primary α-aluminium phase were discussed. XRD and EDS analyses suggested some chemical reactions at the interface of EPPs with the molten aluminium. T6 heat treatment in the ambient atmosphere improved the average compressive tensile strength, plateau stress, and absorption capacity of the syntactic foams by more than 100%. Uniform deformation and similar densification strains (about 40%) of the as-fabricated and heat-treated syntactic foams during the compression test suggested uniform distribution of EP particles and metallic struts in the aluminium alloy matrix. Full article
(This article belongs to the Special Issue Advanced Metallic Foams)
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15 pages, 11287 KiB  
Article
Production of Refined and Modified Closed-Cell Aluminum Foams by Melt-Foaming Method
by Alberto Jesús Poot Manzanilla, Alejandro Cruz Ramírez, Eduardo Colin García, José Antonio Romero Serrano, Ricardo Gerardo Sánchez Alvarado and Miguel Ángel Suárez Rosales
Metals 2023, 13(3), 622; https://doi.org/10.3390/met13030622 - 20 Mar 2023
Viewed by 1328
Abstract
Closed-cell A356 aluminum alloy foams refined and modified were successfully fabricated by using barite and calcium carbonate as thickening and foaming agents, respectively. A melt treatment consisting of adding master alloys of Al-5Ti-1B and Al-10Sr for refining the dendritic microstructure and modifying the [...] Read more.
Closed-cell A356 aluminum alloy foams refined and modified were successfully fabricated by using barite and calcium carbonate as thickening and foaming agents, respectively. A melt treatment consisting of adding master alloys of Al-5Ti-1B and Al-10Sr for refining the dendritic microstructure and modifying the primary eutectic silicon, respectively, were included in the foaming process. The microstructure and mechanical properties of the foams manufactured were analyzed and compared with foams produced without the refining and modifying treatments. The secondary dendritic arm spacing (SDAS) was determined by optical measurements. Lower SDAS values were obtained in foam regions closer to the mold walls due to the high solidification rate imposed during the cooling step and a decrease in the SDAS values for the foams produced with the addition of the Al-5Ti-1B master alloy was evident. Additionally, the addition of the Al-10Sr master alloy caused the formation of solid solution dendrites and a fine irregular fibrous form of silicon. Foams produced with the melt treatment exhibit a good combination of structure and mechanical properties. Therefore, the melt route established is a feasible way to improve foam performance where the lowest SDAS and the highest mechanical properties were obtained for the closed-cell foams produced. Full article
(This article belongs to the Special Issue Advanced Metallic Foams)
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7 pages, 2628 KiB  
Article
Interfacial Reactions between AlSi10 Foam Core and AISI 316L Steel Sheets Manufactured by In-Situ Bonding Process
by Girolamo Costanza and Maria Elisa Tata
Metals 2021, 11(9), 1374; https://doi.org/10.3390/met11091374 - 31 Aug 2021
Cited by 4 | Viewed by 1354
Abstract
Aluminum foam sandwiches (AFS) with AlSi10 foam cores and AISI 316L steel skins are manufactured by an in-situ bonding process. The precursor of the core foam was made with the powder compacted method. The precursor and skins, coupled together, were then heated up [...] Read more.
Aluminum foam sandwiches (AFS) with AlSi10 foam cores and AISI 316L steel skins are manufactured by an in-situ bonding process. The precursor of the core foam was made with the powder compacted method. The precursor and skins, coupled together, were then heated up to the melting point of the Al alloy. The gas released by the blowing agent formed hydrogen bubbles in the melt. producing the foam. Such a porous structure was kept frozen at room temperature via cooling in cold water. To optimize the process conditions, some foaming experiments have been conducted with different holding times and temperatures. Such manufactured AFS were cut, chemically etched and studied with an optical microscope associated with image analysis software to get information about pores morphology in terms of circularity and equivalent diameter. The interface AlSi10-AISI316L has been characterized by SEM and EDX to investigate the bonding conditions between cores and skins. Finally, the AFS have been polished and etched to analyze the microstructure. Quasi-static compressive tests have been performed on the AFS. Obtained results showed that the interface formed during the foaming can be characterized by the inter-diffusion of alloying elements, as confirmed by the good quality of metallurgical joints. Full article
(This article belongs to the Special Issue Advanced Metallic Foams)
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