Compressive behavior of Zn–22Al closed-cell foams under uniaxial quasi-static loading

Astaraie, A. Heydari; Shahverdi, Hamid Reza; Elahi, S. Hossein

doi:10.1016/s1003-6326(15)63591-9

Cited by 22 publications

(17 citation statements)

References 22 publications

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“…The brittle foam struts tend to break at relatively small local strains and the failure of a single strut increases the load on its neighbors thus eventually initiating a failure cascade. Heydari et al [18] previously reported brittle fracture in metal foams with a similar ZA22 matrix during compression. Macroscopically, the consecutive strut fracture results in the formation of shear bands and a distinct plateau stress decrease.…”

Section: Resultsmentioning

confidence: 99%

“…Most of the published research has focused on Zn alloy foams produced with gas-releasing agent methods. Due to a non-uniform growth of gas bubbles during solidification, such foams contain pores with different shapes and sizes [18] that often follow a gravity-induced density gradient. As a result, this production technique is commonly associated with irregular porous structures and scattering mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Heat Treatment on the Compressive Behavior of Zinc Alloy ZA27 Syntactic Foam

et al. 2019

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Zinc alloy (ZA27) syntactic foams (SF) were manufactured using expanded perlite (EP) particles and counter-gravity infiltration casting. Due to a variation of the metallic matrix content, the density of the produced foam samples varied from 1.78 to 2.03 g·cm−3. As-cast and solution heat-treated samples were tested to investigate the compressive properties of the ZA27 syntactic foam. To this end, quasi-static compression tests were conducted. In addition, microstructural analysis of the as-cast and heat-treated syntactic foams was carried out using scanning electron microscopy. The results indicate that the heat treatment alters the microstructure of the ZA27 alloy matrix from a multiphase dendrite to a spheroidized microstructure with improved ductility. Moreover, the heat treatment considerably enhances the energy absorption and plateau stress ( σ pl ) of the syntactic foam. Optical analysis of the syntactic foams under compression shows that the dominant deformation mechanism of the as-cast foams is brittle fracture. In comparison, the heat-treated samples undergo a more ductile deformation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Compressive Behavior of Zinc Alloy ZA27 Syntactic Foam

et al. 2019

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“…Porous Aluminum (Al) has attracted substantial attention due to its lightweight, low density and unique combination of physical and mechanical characteristics such as high strength-to-weight ratio, high stiffness, excellent impact energy absorption, high damping capacity, and good sound absorption properties [ 1 , 2 , 3 , 4 , 5 ]. Owing to its excellent properties, it is widely applied in circumstances where high strength and stiffness-to-weight ratio are concerned, as well as in the areas where energy absorption and permeability are appreciated [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Compressive Properties of Low to Medium Porosity Closed-Cell Porous Aluminum Using PMMA Space Holder Technique

et al. 2016

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In recent years, closed-cell porous Aluminum (Al) has drawn increasing attention, particularly in the applications requiring reduced weight and energy absorption capability such as in the automotive and aerospace industries. In the present work, porous Al with closed-cell structure was successfully fabricated by powder metallurgy technique using PMMA as a space holder. The effects of the amount of PMMA powder on the porosity, density, microstructure and compressive behaviors of the porous specimens were systematically evaluated. The results showed that closed-cell porous Al having different porosities (12%–32%) and densities (1.6478 g/cm3, 1.5125 g/cm3 and 1.305 g/cm3) could be produced by varying the amount of PMMA (20–30 wt %). Meanwhile, the compressive behavior results demonstrated that the plateau stress decreased and the energy absorption capacity increased with increasing amount of PMMA. However, the maximum energy absorption capacity was achieved in the closed-cell porous Al with the addition of 25 wt % PMMA. Therefore, fabrication of closed-cell porous Al using 25 wt % PMMA is considered as the optimal condition in the present study since the resultant closed-cell porous Al possessed good combinations of porosity, density and plateau stress, as well as energy absorption capacity.

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“…Porous metals, specifically porous aluminum interestingly exhibits extra lightweight properties, a high strength to weight ratio, and excellent energy absorption capacity by experiencing large plastic deformation under blast or shock loading [1][2]. Depending on the connectivity of the cells, porous aluminum can be categorized as either having an open-celled or a closed-cell structure [3].…”

Section: Introductionmentioning

confidence: 99%

“…Opencelled porous aluminum is extremely lightweight with an adjustable elastic modulus, thus it is cost effective and widely utilized in functional applications such as heat exchangers, filters, and sound and energy absorbers [4]. Conversely, closed-cell porous aluminum possesses a high bulk density, modulus and strength, and is extensively applied in structural applications such as energy absorption capability, cores in sandwich panels and blast resistant [2][3][4]. To date, various processing techniques have been implemented to fabricate porous aluminum, some of which are solid state, liquid state, gas or vapour state and electro-deposition processes.…”

Section: Introductionmentioning

confidence: 99%

Preliminary development of porous aluminum via powder metallurgy technique

Jamal

Maizatul

Anuar

et al. 2018

Materialwissenschaft Werkst

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Porous aluminum has been extensively studied, particularly in the field in which lightweight and high stiffness properties are essential. In this study, a preliminary investigation is performed to determine the optimum sintering temperature to develop porous aluminium by a powder metallurgy technique, using polymethylmethacrylate as a space holder. The effects of the sintering temperatures on the physical characteristics, oxidation level, microstructure and sintered density of the porous specimen are systematically evaluated. Based on the results, an increase in the sintering temperature from 580 8C to 600 8C changes the colour of the porous aluminum body from a silver-like colour to a gold-like colour, with some of the specimens encountering severe cracking, spalling and even collapsing. As such, the oxygen content is significantly increased from 0.45 wt.% to 2.14 wt. %, suggesting the oxidation phenomenon. In line with this, an obvious appearance of particle boundaries with less macro-pores formation is also observed. Additionally, the sintered density of the porous specimen is found to reduce from 1.305 g/cm 3 to 0.908 g/cm 3 . Therefore, fabrication of the resultant porous aluminium at 580 8C is an ideal condition in this study, owing to the ideal combination of physical characteristics, microstructure, oxidation level and sintered density. Keywords: Porous aluminium / polymethylmethacrylate / powder metallurgy / sintering temperature / physical characteristics / microstructure / oxidation level / sintered density Schlü sselwö rter: Porö ses Aluminium / Polymethylmethacrylat / Pulvermetallurgie / Sintertemperatur / physikalische Eigenschaften / Gefü ge / Oxidationsstufe / Sinterdichte Preliminary development of porous aluminum

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Compressive behavior of Zn–22Al closed-cell foams under uniaxial quasi-static loading

Cited by 22 publications

References 22 publications

Effect of Heat Treatment on the Compressive Behavior of Zinc Alloy ZA27 Syntactic Foam

Effect of Heat Treatment on the Compressive Behavior of Zinc Alloy ZA27 Syntactic Foam

Fabrication and Compressive Properties of Low to Medium Porosity Closed-Cell Porous Aluminum Using PMMA Space Holder Technique

Preliminary development of porous aluminum via powder metallurgy technique

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