Compressive properties at elevated temperatures of porous aluminum processed by the spacer method

Hakamada, Masataka; Nomura, Tatsuho; Yamaguchi, Yasuo; Chino, Yasumasa; Hosokawa, Hiroyuki; Nakajima, Takashi; Chen, Youqing; Kusuda, Hiromu; Mabuchi, Mamoru

doi:10.1557/jmr.2005.0415

Cited by 16 publications

(7 citation statements)

References 15 publications

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“…The primary effect of porosity is increasing the rate factor in the power-law creep equation. The invariability of stress exponents has also been found in earlier studies for cellular solids [9,10,11,12], which are generally differentiated from porous materials by having porosities above 70% [13].…”

Section: Introductionsupporting

confidence: 58%

Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions

Kwok

Boccaccini

Persson

et al. 2016

International Journal of Solids and Structures

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The effective steady-state creep response of porous metals is studied by numerical homogenization and analytical modeling in this paper. The numerical homogenization is based on finite element models of three-dimensional microstructures directly reconstructed from tomographic images. The effect of model size, representativeness, and boundary conditions on the numerical results are investigated. Two analytical models for creep rate of porous bodies are derived by extending the Hashin-Shtrikman bound and the Ramakrishnan-Arunchalam model in linear elasticity to steady-state creep based on nonlinear homogenization. The numerical homogenization prediction and analytical models obtained in this work are compared against reported measurements and models. The relationship between creep rate and porosity computed by homogenization is found to be bounded by the Hodge-Dunand model and the Hashin-Shtrikman creep model, and closely matched by the Gibson-Ashby compression and the Ramakrishnan-Arunchalam creep models.

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Section: Introductionsupporting

confidence: 58%

Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions

Kwok

Boccaccini

Persson

et al. 2016

International Journal of Solids and Structures

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“…The fabrication method is described in detail elsewhere. [8][9][10][11][12][13] In brief, commercially available 99.9% pure Al powder and sieved NaCl particles were prepared and were thoroughly mixed. Spark plasma sintering ͑SPS-515S, Sumitomo Coal Mining Co. Ltd.͒ was then conducted by applying an on-off dc pulse current through the mixture compacted between graphite punches.…”

Section: A Processing Of Materialsmentioning

confidence: 99%

Sound absorption characteristics of porous aluminum fabricated by spacer method

Hakamada

Kuromura

Chen

et al. 2006

Journal of Applied Physics

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Porous Al specimens with porosities of 85%–95% and pore sizes of 212–300to610–700μm were fabricated by the spacer method, and their sound absorption coefficients were investigated by the transfer function method. The sound absorption coefficient increased with porosity. However, there was no apparent correlation between pore size and sound absorption coefficient. Also, the sound absorption coefficient depended on the thickness. The sound absorption coefficient of a specimen was significantly improved by the modification of aperture size, even if the porosity and pore size were unchanged. Therefore, it is suggested that sound absorption behavior is strongly affected by not only the porosity and pore size but also the aperture size for porous Al fabricated by the spacer method.

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“…Buckling of cell walls was the dominant deformation mechanism [8]. Compressive properties at 300-500 • C of aluminium foams produced by the spacer method were also investigated [9]. The stress expo-nent and activation energy for deformation at elevated temperatures in the Al foams were in agreement with those in the bulk Al alloy [9].…”

Section: Introductionmentioning

confidence: 71%

“…Compressive properties at 300-500 • C of aluminium foams produced by the spacer method were also investigated [9]. The stress expo-nent and activation energy for deformation at elevated temperatures in the Al foams were in agreement with those in the bulk Al alloy [9]. The dynamic compressive behaviour of aluminium foams was investigated at different temperatures [10].…”

Section: Introductionmentioning

confidence: 92%

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High-temperature compression of closed cell aluminium foams

Kováčik¹,

Orovčík²,

Jerz³

2016

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The compression behaviour of closed cell aluminium foams (Al99.5, AlMg1Si0.6 and AlSi12 matrix alloys, TiH2 foaming agent) prepared by powder metallurgy was studied in the temperature range of 20-550 • C. It was observed that the temperature increase results in the decrease of the compression strength and energy absorption and increase of densification strain (plateau length) at constant density. The dependence of compression strength on foam density and temperature was successfully modelled using new proposed equation. The activation energy for compression of aluminium foams seems to be density dependent with a maximum at certain density range depending on foam composition. It was also found that the characteristic exponent T f for the compression strength of aluminium foams is temperature dependent variable. The strain at compression strength (deformation up to the macroscopic failure of foam) is nearly temperature independent or decreases at constant density depending on aluminium alloy matrix. The absorbed energy per unit volume of aluminium foams decreases with increasing temperature significantly due to the decrease in the value of plateau/compression strength at constant density.

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Compressive properties at elevated temperatures of porous aluminum processed by the spacer method

Cited by 16 publications

References 15 publications

Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions

Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions

Sound absorption characteristics of porous aluminum fabricated by spacer method

High-temperature compression of closed cell aluminium foams

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