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Metals
Special Issues
Porous Metals and Metallic Foams
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Porous Metals and Metallic Foams

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

Deadline for manuscript submissions: closed (31 March 2018) | Viewed by 12804

Special Issue Editor

Prof. Dr. Afsaneh Rabiei

E-Mail Website
Guest Editor
Advanced Materials Research Lab, Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695 USA
Interests: metal foams; advanced materials; coatings; composites; manufacturing; microstructure; in situ SEM
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is my pleasure to guest edit another Special Issue of Metals on Porous Metals and Metallic Foams. In this Special Issue, we will aim to publish papers with a focus on manufacturing, characterization and modeling of metallic foams. I look forward to seeing your contribution for potential publication in this Special Issue.

Prof. Dr. Afsaneh Rabiei
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

  • metal foams

  • modeling

  • characterization

  • manufacturing

  • porous metal

Published Papers (3 papers)

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Research

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793 KiB  
Article
Influence of the Heating Rate on the Foaming Behavior of Various Aluminium Alloys
by Tillmann R. Neu, Beate Pfretzschner, Francisco García-Moreno and John Banhart
Metals 2017, 7(9), 323; https://doi.org/10.3390/met7090323 - 23 Aug 2017
Cited by 7 | Viewed by 3507
Abstract
Powders of metallurgically prepared precursors expand to a foam differently depending on how fast they are heated to their foaming temperature. The foaming behavior of four alloys was studied with heating rates varying from 0.1 K/s to 18 K/s. It was found that [...] Read more.
Powders of metallurgically prepared precursors expand to a foam differently depending on how fast they are heated to their foaming temperature. The foaming behavior of four alloys was studied with heating rates varying from 0.1 K/s to 18 K/s. It was found that each alloy shows its own non-linear behavior of expansion values. Alloys not containing magnesium exhibit a maximum at intermediate heating rates, whereas Mg-containing alloys tend to expand more for higher heating rates. Full article
(This article belongs to the Special Issue Porous Metals and Metallic Foams)
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1145 KiB  
Article
Coalescence Avalanches in Liquid Aluminum Foams
by Marlen Paeplow, Francisco García-Moreno, Aaron Joseph Meagher, Alexander Rack and John Banhart
Metals 2017, 7(8), 298; https://doi.org/10.3390/met7080298 - 04 Aug 2017
Cited by 5 | Viewed by 4145
Abstract
Coalescence is the rupture of a film between two adjacent bubbles in any type of liquid foam and has pronounced influence on the development of its macrostructure after solidification, mostly leading to larger pores and a wider size distribution. Foamable AlSi6Cu4 + 0.5 [...] Read more.
Coalescence is the rupture of a film between two adjacent bubbles in any type of liquid foam and has pronounced influence on the development of its macrostructure after solidification, mostly leading to larger pores and a wider size distribution. Foamable AlSi6Cu4 + 0.5 wt % TiH2 precursors made following the powder metallurgical route were foamed in a gas-tight X-ray transparent furnace under 500 kPa (5 bar) pressure with subsequent pressure release. Coalescence was investigated by fast X-ray radioscopy at a frame rate of 1250 Hz and an effective pixel size of 9 µm at the beamline ID-19, European Synchrotron Radiation Facility (ESRF), Grenoble, France. A self-developed program yielded the temporal and spatial detection of coalescence events in the acquired radioscopies. We observed the occurrence of film ruptures in a short temporal and spatial distance and we will refer to these phenomena as “avalanches”. Full article
(This article belongs to the Special Issue Porous Metals and Metallic Foams)
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Review

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24 pages, 6592 KiB  
Review
Strongly Orthotropic Open Cell Porous Metal Structures for Heat Transfer Applications
by Marcel Fink, Olaf Andersen, Torsten Seidel and André Schlott
Metals 2018, 8(7), 554; https://doi.org/10.3390/met8070554 - 19 Jul 2018
Cited by 14 | Viewed by 4306
Abstract
For modern thermal applications, open cell porous metals provide interesting opportunities to increase performance. Several types of cellular metals show an anisotropic morphology. Thus, using different orientations of the structure can boost or destroy the performance in thermal applications. Examples of such cellular [...] Read more.
For modern thermal applications, open cell porous metals provide interesting opportunities to increase performance. Several types of cellular metals show an anisotropic morphology. Thus, using different orientations of the structure can boost or destroy the performance in thermal applications. Examples of such cellular anisotropic structures are lotus-type structures, expanded sheet metal, and metal fiber structures. Lotus-type structures are made by casting and show unidirectional pores, whereas expanded sheet metal structures and metal fiber structures are made from loose semi-finished products that are joined by sintering and form a fully open porous structure. Depending on the type of structure and the manufacturing process, the value of the direction-dependent heat conductivity may differ by a factor of 2 to 25. The influence of the measurement direction is less pronounced for the pressure drop; here, the difference varies between a factor of 1.5 to 2.8, depending on the type of material and the flow velocity. Literature data as well as own measurement methods and results of these properties are presented and the reasons for this strongly anisotropic behavior are discussed. Examples of advantageous applications, for example a latent heat storage device and a heat exchanger, where the preferential orientations are exploited in order to gain the full capacity of the structure’s performance, are introduced. Full article
(This article belongs to the Special Issue Porous Metals and Metallic Foams)
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