Mechanical Response of Al Matrix Syntactic Foams Produced by Pressure Infiltration Casting

Zhang, L.P.; Zhao, Yuyuan

doi:10.1177/0021998307074132

Cited by 99 publications

(74 citation statements)

References 5 publications

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“…The two materials show a similar performance but the syntactic foams are marginally less attractive for lightweight panels owing to their high density. [1][2][3][4][5][12][13][14][15] The energy absorbed is higher per unit volume or mass than for the equivalent porous metal, but much lower than for "conventional" syntactic foams. The much-reduced load drop in the foams presented in this study means that they show high energy absorption efficiencies (85-90%) that are more typical of metal foams and porous metals than "conventional" syntactic foams.…”

Section: Figure 2 Force Required To Eject Castings From the Mould As mentioning

confidence: 96%

“…[1][2][3] Figure 1 presents a schematic stress -strain curve for an ideal energy absorber, [4] with the key characteristic being the flat plateau which can extend to strains in excess of 50%. Figure 1 also shows a typical stress -strain response for a syntactic Al foam where it is apparent that beyond the elastic limit there is a large load drop, [5] which is more pronounced for smaller, stronger hollow spheres, and which it is believed to mark the onset of damage to the spheres and consequent reduction in their load bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

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The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Wright

Kennedy

2016

Adv Eng Mater

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Expanded glass particles (EGP) have been used to manufacture Al syntactic foams using a simple vacuum casting method. Clamping of the casting in the stainless steel mould was observed when preheating the mould to >400°C, causing damage to the EGP, resulting in a weaker foam but with the significant advantage of eliminating the yield drop, improving the energy absorption characteristics. The same effect in castings that were not clamped (for mould preheats < 400°C) could be achieved by quenching in liquid nitrogen. These "low strength" syntactic metal foams are a costeffective alternative to metal foams and porous metals (in terms of specific strength, stiffness and energy absorption) rather than "conventional" syntactic foams which contain smaller, stronger, hollow microspheres.

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Section: Figure 2 Force Required To Eject Castings From the Mould As mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Wright

Kennedy

2016

Adv Eng Mater

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“…Zhang and Zhao investigated the mechanical response of four types of Al based MMSF with different sphere sizes and densities under static and dynamic conditions. The plateau strength and the energy absorption of the MMSFs were largely determined by the volume fraction of Al and to a lesser extent by the properties of the ceramic spheres [45]. Although the most common matrix materials are Al and steel, other perspective matrices, such as Mg [46][47][48][49][50], Zn [51,52] and Ti [53,54] alloys were also studied.…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

et al. 2015

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HighlightsLow pressure infiltration is suitable to produce MMSFs with hollow iron spheres.The MMSFs showed plastic yielding and long, slowly ascending plateau region.The matrix and the heat treatment strongly influence the properties of the MMSFs.The full-scale FEM model gives excellent agreement compared to the measured values. Highlights (for review) *Manuscript Click here to view linked References AbstractAluminium alloy syntactic foams reinforced with iron hollow spheres were produced by low pressure, liquid phase inert gas infiltration technique. Four Al alloys (Al99.5, AlSi12, AlMgSi1 and AlCu5) and Globomet grade iron hollow spheres were used as matrix and reinforcing material, respectively. The produced composite blocks were characterised according to the ruling standard for compression of cellular materials in order to ensure full comparability. The compressive test results showed plastic yielding and a long, slowly ascending plateau region that ensures large energy absorption capability. The proper selection of the matrix material and the applied heat treatment allows for a wide range of tailoring of the mechanical properties. For design purposes, the full-scale finite element method (FEM) model of the investigated foams was created and tested on Al99.5 matrix foams. The FEM results showed very good agreement with the measured values (typically within 5% in the characteristic properties and within 10% for the whole compression curve).

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“…The threshold pressure can be calculated (estimated) [21][22][23][24][25][26][27][28] or measured [29][30][31]. Pressure infiltration is capable of producing MMSFs with maximal (~64 vol%) hollow sphere volume fraction and better matrix dispersion, but it requires more investment and more sophisticated equipment [29,30,[32][33][34][35][36][37][38]. In practice, usually one kind of hollow sphere set with monomodal diameter distribution is applied as reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang and Zhao [36] investigated the mechanical response of ASFs with low-cost porous ceramic hollow spheres under static and dynamic conditions. The plateau strength and the absorbed energy were largely determined by the volume fraction of Al and to a lesser extent by the properties of the hollow spheres.…”

Section: Introductionmentioning

confidence: 99%

Characteristic compressive properties of hybrid metal matrix syntactic foams

Májlinger

Orbulov

2014

Materials Science and Engineering: A

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Hybrid metal matrix syntactic foams (hybrid MMSFs) are particle reinforced composites in which the reinforcement is the combination of more than one grade of hollow spheres. The difference between the spheres can be in their chemical composition, dimension, physical properties etc. In this study AlSi12 matrix hybrid MMSFs with monomodal Globocer (Al2O3 and SiO2 based ceramic) and Globomet (pure Fe) reinforcements were produced by pressure infiltration. The investigation parameters were the ratio of the hollow sphere grades and the aspect ratio of the specimens. Microstructural investigations showed almost perfect infiltration and favourable interface layer, while quasi-static compression tests showed that the composition of the reinforcement and the aspect ratio of the specimens have determinative effect on the characteristic properties (compressive and flow strength, fracture strain, stiffness and absorbed energy). This nature of the MMSFs ensures the possibility to tailor their properties in order to optimise them for a given application.

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Mechanical Response of Al Matrix Syntactic Foams Produced by Pressure Infiltration Casting

Cited by 99 publications

References 5 publications

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

Characteristic compressive properties of hybrid metal matrix syntactic foams

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