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Metal Matrix Composites and Syntactic Foams: Manufacturing, Properties and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 1608

Special Issue Editor


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Guest Editor
1. College of Mechanical and Automotive Engineering, Ningbo University of Technology, Ningbo, China
2. School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
Interests: metal matrix composites; metal matrix syntactic foams; porous metals; metal powders
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metal matrix composites have experienced rapid developments in the last few decades. The field is still expanding when new matrix materials, new reinforcements, new manufacturing technologies and new applications are explored. Metal matrices cover almost all types of alloys, from aluminum alloys to steel, titanium, magnesium and more advanced high-performance alloys, such as high-entropy alloys. The reinforcements vary not only in form from particulates to fibers but also in materials from ceramics to some exotic fillers. In fact, the word “reinforcement” is not an accurate description of the second phase, as many second phases are added not necessarily to make the composite stronger and stiffer but to provide a special function. For example, metal matrix syntactic foam is a special composite containing hollow ceramic particles to offer compressibility and thus energy-absorption capabilities. While the more conventional manufacturing methods, such as casting, powder metallurgy and spray forming, are still the mainstream, recent advances in new technologies, e.g., additive manufacturing, have provided a new impetus to the field. This Special Issue covers a wide range of topics with emphasis on recent developments in materials, fabrication, characterization, properties and applications.

Prof. Dr. Yuyuan Zhao
Guest Editor

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Keywords

  • metal matrix composites
  • metal matrix syntactic foams
  • matrix materials
  • reinforcement
  • fabrication methods
  • characterization methods
  • properties
  • applications

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Published Papers (2 papers)

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Research

16 pages, 2454 KiB  
Article
Numerical Modeling of Plasticity in Metal Matrix Fiber Composites
by Gennadiy Lvov and Maria Tănase
Appl. Sci. 2024, 14(19), 8679; https://doi.org/10.3390/app14198679 - 26 Sep 2024
Viewed by 449
Abstract
This paper presents micromechanical analyses of an orthogonally reinforced composite with new constitutive equations of kinematic plastic hardening. The homogenization of plastic properties was performed through a numerical analysis of a representative volume using the finite element method. A modification of Prager’s theory [...] Read more.
This paper presents micromechanical analyses of an orthogonally reinforced composite with new constitutive equations of kinematic plastic hardening. The homogenization of plastic properties was performed through a numerical analysis of a representative volume using the finite element method. A modification of Prager’s theory was used to construct physical relations for an equivalent orthotropic material. In the proposed version of the theory, a special tensor for back stresses is introduced, which takes into account the difference in the rate of hardening for different types of plastic deformation. For boron–aluminum orthogonally reinforced composite with known mechanical properties of fibers and matrix, all material parameters of the theory were determined, deformation diagrams were constructed, and the equation for a plasticity surface in a six-dimensional stress space was obtained. The advantage of the developed method of numerical homogenization is that it only requires a minimal amount of experimental data. The efficiency of micromechanical analysis makes it possible to optimally design metal matrix composites with the required plastic properties. Full article
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14 pages, 5822 KiB  
Article
Tribological Properties of Aluminium Matrix Syntactic Foams Manufactured with Aluminium Smelter Waste
by Bhavik Mehta and Yuyuan Zhao
Appl. Sci. 2024, 14(10), 4288; https://doi.org/10.3390/app14104288 - 18 May 2024
Viewed by 795
Abstract
Aluminium smelter waste (ASW) is a big contributor to landfills, and its recycling has been of great interest. This study investigates the tribological properties of aluminium matrix syntactic foams manufactured using an Al 6082 alloy and ASW. Ball-on-disc tests were conducted under both [...] Read more.
Aluminium smelter waste (ASW) is a big contributor to landfills, and its recycling has been of great interest. This study investigates the tribological properties of aluminium matrix syntactic foams manufactured using an Al 6082 alloy and ASW. Ball-on-disc tests were conducted under both dry and lubricated conditions. Under dry sliding conditions, the coefficient of friction (COF) had an initial sharp increase, followed by a gradual decrease and finally a steady state as the sliding distance increased. The wear surfaces showed the presence of adhesive, abrasive and oxidative wear, with some presence of delamination. Syntactic foams containing small ASW particles led to a decrease in surface roughness, decrease in the average COF and decrease in specific wear. Heating large ASW particles before manufacturing the syntactic foams enhanced overall wear properties because the particles are hardened due to a compositional change. The T6 treatment of the syntactic foams enhanced the wear properties due to the hardening of the Al matrix. The average COF of the ASW syntactic foams was higher than that of the E-sphere syntactic foam, which was predominantly abrasive wear. The specific wear of the ASW syntactic foams can be higher or lower than the E-sphere syntactic foam, depending on the ASW particle size. Under lubricated sliding test conditions, the wear was reduced significantly, and the type changed from predominantly adhesive to predominantly abrasive. The porous ASW particles acted as lubricant reservoirs and provided a constant supply of lubricant, further improving the lubrication effect. Full article
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