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Porous Metals: Preparation, Microstructure, Properties and Performance (Second Edition)
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Porous Metals: Preparation, Microstructure, Properties and Performance (Second Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: 20 December 2025 | Viewed by 339

Special Issue Editors

Prof. Dr. Yuyuan Zhao

E-Mail Website
Guest Editor
College of Mechanical and Automotive Engineering, Ningbo University of Technology, Ningbo 315211, China
Interests: porous metals; metal matrix syntactic foams; metal powders; thermos-fluids in porous media
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Huiping Tang

E-Mail Website
Guest Editor
Advanced Materials Additive Manufacturing Innovation Research Center, Hangzhou City University, Hangzhou, China
Interests: porous metals, powder metallurgy, additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Porous metals (also known as metal foams or cellular metals) comprise a special class of composite materials, composed of a metal phase and a gaseous phase. The functionality of porous metals is derived from the combinations of these two distinctively different materials and, in essence, their specific porous structures. Porous metals are produced via a variety of techniques, including foaming, casting, and powder metallurgy. Recent advances in additive manufacturing have provided a new impetus to the field. Porous metals are finding new applications in many sectors, such as aerospace, automotive, construction, and energy, for their unique properties. This Special Issue of Materials intends to cover a wide range of porous metal structures manufactured by different technologies. Special emphasis will be placed on new fabrication methods, novel structures, new properties, and new applications of porous metals.

Prof. Dr. Yuyuan Zhao
Prof. Dr. Huiping Tang
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 250 words) can be sent to the Editorial Office for assessment.

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. Materials is an international peer-reviewed open access semimonthly 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

  • porous metals
  • metal foams
  • cellular metals
  • porous structure
  • fabrication methods
  • properties
  • applications

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Published Papers (1 paper)

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Research

22 pages, 8864 KB  
Article
Enhanced Sound Absorption of Aluminum Foam Composites by Introducing Pore-Penetrating Fibers
by Bei Huang, Shuang Xiong, Xin Wang, Longyue Qin, Xiaoqing Zuo and Hui Wang
Materials 2025, 18(24), 5515; https://doi.org/10.3390/ma18245515 - 8 Dec 2025
Viewed by 143
Abstract
To address the issue of sound absorption valleys in open-cell aluminum foam and enhance mid-to-high frequency (800–6300 Hz) performance, we developed a novel pore-penetrating 316L stainless steel fiber–aluminum foam (PPFCAF) composite using an infiltration method. The formation mechanism of the pore-penetrating fibers, the [...] Read more.
To address the issue of sound absorption valleys in open-cell aluminum foam and enhance mid-to-high frequency (800–6300 Hz) performance, we developed a novel pore-penetrating 316L stainless steel fiber–aluminum foam (PPFCAF) composite using an infiltration method. The formation mechanism of the pore-penetrating fibers, the resultant pore-structure, and the accompanying sound absorption properties were investigated systematically. The PPFCAF was fabricated using 316L stainless steel fiber–NaCl composites created by an evaporation crystallization process, which ensured the full embedding of fibers within the pore-forming agent, resulting in a three-dimensional fiber-pore interpenetrating network after infiltration and desalination. Experimental results demonstrate that the PPFCAF with a porosity of 82.8% and a main pore size of 0.5 mm achieves a sound absorption valley value of 0.861. An average sound absorption coefficient is 0.880 in the target frequency range, representing significant improvements of 9.8% and 9.9%, respectively, higher than that of the conventional infiltration aluminum foam (CIAF). Acoustic impedance reveal that the incorporated fibers improve the impedance matching between the composite material and air, thereby reducing sound reflection. Finite element simulations further elucidate the underlying mechanisms: the pore-penetrating fibers influence the paths followed by air particles and the internal surface area, thereby increasing the interaction between sound waves and the solid framework. A reduction in the main pore size intensifies the interaction between sound waves and pore walls, resulting in a lower overall reflection coefficient and a decreased reflected sound pressure amplitude (0.502 Pa). In terms of energy dissipation, the combined effects of the fibers and refinement increase the specific surface area, thereby strengthening viscous effects (instantaneous sound velocity up to 46.1 m/s) and thermal effects (temperature field increases to 0.735 K). This synergy leads to a notable rise in the total plane wave power dissipation density, reaching 0.0609 W/m3. Our work provides an effective strategy for designing high-performance composite metal foams for noise control applications. Full article
(This article belongs to the Special Issue Porous Metals: Preparation, Microstructure, Properties and Performance (Second Edition))
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