Effect of particle size and volume ratio of ceramic hollow spheres on the mechanical properties of bimodal composite metal foams

Kemény, Alexandra; Leveles, Borbála; Bubonyi, Tamás; Orbulov, Imre Norbert

doi:10.1016/j.compositesa.2020.106152

Cited by 39 publications

(22 citation statements)

References 46 publications

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“…The exact method was discussed in previous publications. [20,40] For the casting, a steel frame was used to bear the applied pressure on the chamber. The CHSs were poured into a bottom-perforated mild steel (S235) closed section, supported underneath with an alumina (Al 2 O 3 ) quilt layer, to prevent flow-through of the low-viscosity melt.…”

Section: Production Methodsmentioning

confidence: 99%

“…Our research group had conducted fundamental studies on Al99.5 and AlSi12 matrix bimodal CMFs with different diameter to height ratios [ 22 ] and with various filler ratios. [ 20 ] The results were promising, as the “rule of mixtures” was applicable for the compressive properties of the bimodal CMFs based on the properties of the unimodal ones.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and Comparison of Sr Modified or Unmodified AlSi12 Eutectic Alloy Matrix Unimodal and Bimodal Composite Metal Foams

et al. 2021

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Metallic foams are designed to be generally used by the transportation industry as energy‐absorbing reinforcements in bumper panels or as permanent cores for weight reduction. In composite metal foams (CMFs), the second phase is usually formed by hollow spheres or closed‐wall porous materials responsible for the gas (void) intake. Herein, three types of samples are compared: CMFs with unimodal small, unimodal large, and bimodally mixed small and large ceramic hollow spheres. Unmodified AlSi12 or Sr modified AlSi12 alloy is infiltrated between the spheres with low‐pressure infiltration to form the cellular structure. The effect of Sr modification on the matrix material properties and the matrix–filler interface layer is investigated. The samples are evaluated and compared based on microstructural analysis and standardized compressive tests; the fracture mechanism of the structure is analyzed using computed tomography measurements at different deformation states. The aim of this research is to develop high‐performance unimodal and bimodal CMFs, which have better specific mechanical properties than conventional metal foams, and to investigate the effect of Sr modification on the material properties. With these foams, additional weight reduction and higher energy absorption can be achieved, primarily used as automotive components.

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Section: Production Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Manufacturing and Comparison of Sr Modified or Unmodified AlSi12 Eutectic Alloy Matrix Unimodal and Bimodal Composite Metal Foams

et al. 2021

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“…At the same time, a sufficient number of precursors in the mould cavity must also be provided in order to interconnect the individual pores. If all precursors did not come into contact with each other, they could remain encapsulated in the volume of the casting and a composite material (so-called syntactic foam or bimodal composite metallic foams) would be formed [37,38]. Precursors can be made of various materials.…”

Section: Infiltration Of Liquid Metal Into the Cavity Filled With Pre...mentioning

confidence: 99%

Preparation of Cast Metallic Foams with Irregular and Regular Inner Structure

et al. 2021

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The aim of this paper is to summarize the possibilities of foundry methods for the production of metallic foams. At present, there are a number of production technologies for this interesting material, to which increasing attention has been paid in recent years. What is unique about metallic foams is the combination of their physical and mechanical properties. As part of our research, we designed and verified four main methods of metallic foam production by the foundry technology, whose products are metallic foam castings with regular and irregular arrangements of internal cavities. All these methods use materials and processes commonly used in conventional foundry technologies. The main idea of the research is to highlight such technologies for the production of metallic foams that could be provided by manufacturing companies without the need to introduce changes in production. Moreover, foundry methods for the production of metallic foams have the unique advantage of being able to produce even complex shaped parts and can thus be competitive compared to today’s established technologies, the output of which is usually only a semi-finished product for further processing. This fact was the main motivation for the research.

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“…Low carbon steel AISI 1018 and hollow alumina microspheres were studied by Castro and Nutt [ 26 ] for energy absorption applications. Aluminum is by far the material most used as matrix with various space holders; Al7075-T/ceramic spheres [ 20 ], Al-7075/pumice particles [ 24 ], Al1050/globocer particles and A413.0/globocer [ 27 ], Al/soda-lime glass particles [ 28 ], A356/perlite [ 29 ], Al/expanded perlite [ 30 ], 2014Al/cenosphere particles [ 31 ], Al/Mg [ 23 ]. Zinc alloy ZA27 filled with expanded perlite was studied by Movahedi and his collaborators [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Aluminum Perlite Syntactic Foams

et al. 2022

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This paper presents the usage of spark plasma sintering (SPS) as a method to obtain aluminum-expanded perlite syntactic foams with high porosity. In the test samples, fine aluminum powder with flaky shape particles was used as matrix material and natural, inorganic, granular, expanded perlite was used as a space holder to ensure high porosity (35–57%) and uniform structure. SPS was used to consolidate the specimens. The structures were characterized by scanning electron microscopy and compression tests. Energy absorption (W~7.49 MJ/m3) and energy absorption efficiency (EW < 90%) were also determined.

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Effect of particle size and volume ratio of ceramic hollow spheres on the mechanical properties of bimodal composite metal foams

Cited by 39 publications

References 46 publications

Manufacturing and Comparison of Sr Modified or Unmodified AlSi12 Eutectic Alloy Matrix Unimodal and Bimodal Composite Metal Foams

Manufacturing and Comparison of Sr Modified or Unmodified AlSi12 Eutectic Alloy Matrix Unimodal and Bimodal Composite Metal Foams

Preparation of Cast Metallic Foams with Irregular and Regular Inner Structure

Aluminum Perlite Syntactic Foams

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