Thermal conductivity of AZ91 magnesium integral foams measured by the Transient Plane Source method

Solórzano, E.; Hirschmann, Markus; Rodríguez‐Pérez, Miguel Ángel; Körner, Carolin; Saja, J.A. de

doi:10.1016/j.matlet.2008.05.020

Cited by 21 publications

(7 citation statements)

References 8 publications

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“…Interest in magnesium foams is increasing in recent times due to their very low density [15][16][17][18]. Only a few studies are available on magnesium matrix syntactic foams [19,20].…”

Section: Syntactic Foamsmentioning

confidence: 99%

Magnesium Matrix Composite Foams—Density, Mechanical Properties, and Applications

Gupta

Luong

Cho

2012

Metals

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Potential of widespread industrial applications of magnesium has been realized in recent years. A variety of magnesium alloy matrix composites are now being studied for mechanical properties. Since magnesium is the lightest structural metal, it can replace aluminum in existing applications for further weight savings. This review presents an overview of hollow particle filled magnesium matrix syntactic composite foams. Fly ash cenospheres are the most commonly used hollow particles for such applications. Fly ash cenospheres primarily have alumino-silicate composition and contain a large number of trace elements, which makes it challenging to study the interfacial reactions and microstructure in these composites. Microstructures of commonly studied AZ and ZC series magnesium alloys and their syntactic foams are discussed. Although only a few studies are available on these materials because of the nascent stage of this field, a comparison with similar aluminum matrix syntactic foams has provided insight into the properties and weight saving potential of magnesium matrix composites. Analysis shows that the magnesium matrix syntactic foams have higher yield strength at the same level of density compared to most other metal matrix syntactic foams. The comparison can guide future work and set goals that need to be achieved through materials selection and processing method development.

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“…Interest in magnesium foams is increasing in recent times due to their very low density [15][16][17][18]. Only a few studies are available on magnesium matrix syntactic foams [19,20].…”

Section: Syntactic Foamsmentioning

confidence: 99%

Magnesium Matrix Composite Foams—Density, Mechanical Properties, and Applications

Gupta

Luong

Cho

2012

Metals

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“…This is a valid procedure as previous works have already demonstrated. [19][20][21] It is important to mention that the non-linear change of f s [18] with density makes both equations similar at high porosities. [19] l gs ¼ l gas V gas þ l sol V 1:55…”

Section: Conduction Through the Solid And Gas Phasesmentioning

confidence: 99%

“…Figure 6 shows the normalized thermal conductivity for ERG open cell aluminum foams, [24,25] alporas foams, [26] aluminum foams, and zinc foams produced by the powder metallurgical route (PM route), [19][20][21]27] open cell infiltrated porous aluminum, [19,20] AZ91 magnesium foams, [21] and copper lotus foams. [28] It is appreciated the influence of cellular structure on the thermal conductivity is much smaller than that of relative density because all these data follow the same trend.…”

Section: Thermal Conductivity Of Foams Based On Conducting Materialsmentioning

confidence: 99%

Influence of Solid Phase Conductivity and Cellular Structure on the Heat Transfer Mechanisms of Cellular Materials: Diverse Case Studies

et al. 2009

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Cellular materials can be considered as two-phase composites in which a gas has been dispersed in a continuous solid phase. Although some porous materials can be found in nature they are usually produced at industrial scale (polymer foams, cellular metals, cellular ceramics, etc.) to satisfy diverse requirements since sometimes required properties are not accessible by using solid materials-technical requirements and less amount of raw material is needed saving costseconomical requirements. Porous materials offer interesting and unique properties as a reduced thermal conductivity, high cushioning capabilities, and excellent noise absorption.The evaluation of the thermal conductivity of cellular materials from the conductivity data of the two component phases and the structure of the material is an interesting subject that has been approached by different authors. [1][2][3][4][5][6][7][8] However, considering the complex relationships between structural parameters, composition and heat transfer mechanism (HTM), further research in this field is still needed.It is expected that HTM (convection, radiation, and conduction) contribute with different weights depending on the relative density and thermal properties of the solid phase. Therefore, radical differences in the relative weights for each HTM are expected for low density materials based on an insulating solid (polymers) or for materials with medium/ high relative densities based on a heat conductor (metals). Although, the number of previous works analyzing each type of material (polymer foams or cellular metals) is largely high, [9][10][11][12][13][14][15][16][17][18] as far as we know, there are no publications considering and comparing the HTM for both types of materials in a single study keeping a similar perspective (i.e., using similar concepts and models).This work uses, on one hand, experimental data and well known analytical models to predict the conductivity of cellular materials and, on the other hand, finite element modeling to investigate the effect of diverse structural parameters on the HTM. The main aim of the paper is to discuss the relative weight of each HTM in the full density range and the effect of the properties of the matrix and the cellular structure on the thermal conductivity for these two types of materials. The key result of this analysis will be a practical knowledge on the mechanisms that have to be taken into account for both types of materials.

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“…It has been proved that this method can be used to measure the properties of small samples and/or inhomogeneous materials (with a non-constant density distribution) by carrying out local measurements that mask out the density distribution. [17] Nevertheless, the measurement can be local or bulk according to the experimental parameters. [18] By using this technique combined with the computed tomography, different types of cellular materials have been analyzed in recent years, from polymer to metal foams.…”

Section: The Transient Plane Source (Tps) Methodsmentioning

confidence: 99%

Heat Transfer in Polypropylene‐Based Foams Produced Using Different Foaming Processes

et al. 2009

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This paper presents the characterization of the cellular structure and thermal conduction behaviour of polypropylene foams produced using different foaming processes, with the aim of selecting the best possible PP foam thermal insulator. Thermal conductivity results have shown that the global heat transfer behaviour is controlled by the relative density. For relative densities higher than 0.2, thermal conductivity differences were insignificant, the data being predicted by the mixture's rule and Russell's model. In the low density range, all of the proposed models underestimated the overall conductivity, the effect of the processing method being more significant, slight differences being observed between foams produced by extrusion and those produced by gas dissolution with higher cell sizes and anisotropies. Foams with finer cellular structures showed to be better insulating materials.

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Thermal conductivity of AZ91 magnesium integral foams measured by the Transient Plane Source method

Cited by 21 publications

References 8 publications

Magnesium Matrix Composite Foams—Density, Mechanical Properties, and Applications

Magnesium Matrix Composite Foams—Density, Mechanical Properties, and Applications

Influence of Solid Phase Conductivity and Cellular Structure on the Heat Transfer Mechanisms of Cellular Materials: Diverse Case Studies

Heat Transfer in Polypropylene‐Based Foams Produced Using Different Foaming Processes

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