Study on fabrication and foaming mechanism of Mg foam using CaCO3 as blowing agent

Yang, Donghui; Hur, Bo-Young; Yang, Shang-Run

doi:10.1016/j.jallcom.2007.07.098

Cited by 90 publications

(44 citation statements)

References 11 publications

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“…Parts of the bubbles overflowed the melt, causing the porosity and average pore size to decline. 4,9) As the result, the cellular Mg alloy foams with relatively high porosities of 73% and pore size of 0.96 mm can be prepared with foaming temperature at 720 o C. in this study, in order to obtain Mg alloy foam with fine pore structures, the foaming temperature should be selected in the range of 690~720 o C. Fig. 6 shows the microstructure of the cell wall of AZ31 Mg alloy foams with different foaming temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication, Microstructure and Compression Properties of AZ31 Mg Foams

Zhao¹,

Li²,

Jeong³

et al. 2011

Korean. J. Mater. Res.

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Melt foaming method is one of cost-effective methods to make metal foam and it has been successfully applied to fabricate Mg foams. In this research, AZ31 Mg alloy ingot was used as a metal matrix, using AlCa granular as thickening agent and CaCO 3 powder as foaming agent, AZ31 Mg alloy foams were fabricated by melt-foaming method at different foaming temperatures. The porosity was above 41.2%~73.3%, pore size was between 0.38~1.52 mm, and homogenous pore structures were obtained. Microstructure and mechanical properties of the AZ31 Mg alloy foams were investigated by optical microscopy, SEM and UTM. The results showed that pore structure and pore distribution were much better than those fabricated at lower temperatures. The compression behavior of the AZ31 Mg alloy foam behaved as typical porous materials. As the foaming temperature increased from 660

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Section: Resultsmentioning

confidence: 99%

“…1,2) Al and Al alloy foams have been developed successfully and have been employed in the new generation of crash boxes. 3,4) Mg and Mg alloy foams are definitely expected to be particularly advantageous due to the good mechanical properties and lower density of their metal matrix, which is approximately two thirds that of Al.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Microstructure and Compression Properties of AZ31 Mg Foams

Zhao¹,

Li²,

Jeong³

et al. 2011

Korean. J. Mater. Res.

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“…At a constant percentage of thickening (Ca) and foaming agents, the pore size (1-3.5 mm) and porosities (50-80%) can be controlled by varying the holding time, usually lasting 30 s. [18,20] A favorable temperature during this period is in the range 690-720 C. Below this range, the material does not foam effectively and due to the high liquid-solid reaction rate and corresponding gas releasing rate it results in a coarse pore structure. The last step to obtain porous magnesium is cooling by air blowing and water spraying.…”

Section: Melt Foaming Methodsmentioning

confidence: 99%

Current Status and Recent Developments in Porous Magnesium Fabrication

et al. 2017

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A significant number of studies have been dedicated to the fabrication and properties of metallic foams. The most recent research is focused on metals with low weight and good mechanical properties, such as titanium, aluminum, and magnesium. Whereas the first two are already fairly well studied and already find application in industry, magnesium currently remains at the research stage. The present review covers the studies conducted on fabrication techniques, surface modifications, and properties of porous structures made of magnesium and its alloys.

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“…Alternative blowing agents have been proposed and tested. Carbonates are cheap and have been shown to blow and even stabilize Al foam, [9][10][11] but their use in conjunction with the powder route is difficult and the foams obtained are still inferior to those blown with TiH 2 . Hydrides have the advantage that no oxide remnant is left behind after decomposition, thus avoiding weakening of the metallic matrix.…”

Section: Introductionmentioning

confidence: 99%

Suitability of various complex hydrides for foaming aluminum alloys

et al. 2013

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Some hydrides that could replace TiH 2 as the hitherto most suitable blowing agent for foaming aluminum alloys were investigated. Hydrides taken from the group MBH 4 (M 5 Li, Na, K) and LiAlH 4 were selected since these have not been studied in the past although their decomposition characteristics appear to be suitable. Foamable precursors of alloy AlSi8Mg4 were manufactured by pressing blends of metal and blowing agent powders. Powders, precursors and precursor filings were studied by mass spectrometry to obtain the hydrogen desorption profile. Foaming experiments were conducted with simultaneous x-ray radiographic monitoring. Two Li-containing blowing agents were found to perform well and can be considered alternatives to TiH 2 .

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Study on fabrication and foaming mechanism of Mg foam using CaCO3 as blowing agent

Cited by 90 publications

References 11 publications

Fabrication, Microstructure and Compression Properties of AZ31 Mg Foams

Fabrication, Microstructure and Compression Properties of AZ31 Mg Foams

Current Status and Recent Developments in Porous Magnesium Fabrication

Suitability of various complex hydrides for foaming aluminum alloys

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