Fabrication of foams of A2024 and A7075 and influence of porosity and heat treatment on their mechanical properties

Fukui, Takaaki; Saito, Mizuki; Nonaka, Yosuke; Suzuki, Shinsuke

doi:10.1299/transjsme.2014smm0248

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…The pores were distributed homogeneously as shown in Figure 5. Although a non-porous part is conventionally found in the bottom part [4], the foams in this study did not show a clear difference of pore distribution at different heights. Therefore, the A2024 alloy foams of each alloy can be fabricated at f s values of 20% and 40%.…”

Section: Analysis Of the Pure Ti Distributioncontrasting

confidence: 67%

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Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Kubo

Saito

Osaka

et al. 2019

Metals

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We investigated pore formation in aluminum foams by controlling primary crystal morphology using three master alloys. The first one was a direct chill cast A2024 (Al-Cu-Mg) alloy (DC-cast alloy). The others were A2024 alloys prepared to possess fine spherical primary crystals. The second alloy was made by applying compressive strain through a Strain-Induced Melt-Activated process alloy (SIMA alloy). The third one was a slope-cast A2024 alloy (slope-cast alloy). Each alloy was heated to either 635 °C (fraction of solid fs = 20%) or 630 °C (fs = 40%). TiH2 powder was added to the alloys as a foaming agent upon heating them to a semi-solid state and they were stirred while being held in the furnace. Subsequently, A2024 alloy foams were obtained via water-cooling. The primary crystals of the DC-cast alloy were coarse and irregular before foaming. After foaming, the size of the primary crystals remained irregular, but also became spherical. The SIMA and slope-cast alloys possessed fine spherical primary crystals before and after foaming. In addition to average-sized pores (macro-pores), small pores were observed inside the cell walls (micro-pores) of each alloy. The formation of macro-pores did not depend on the formation of the primary crystals. Only in the DC-cast alloy did fine micro-pores exist within the primary crystals. The number of micro-pores in the SIMA and slope-cast alloys was one third of that in the DC-cast alloy.

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Section: Analysis Of the Pure Ti Distributioncontrasting

confidence: 67%

“…The compressive properties of foams are determined by their base metal and structure [3]. To this end, Fukui et al [4,5] improved the compressive properties of aluminum foam using the super duralumin A2024 (Al-Cu-Mg) alloy, which is a well-known high-strength and lightweight material, as a base metal to improve the strength of the foam.…”

Section: Introductionmentioning

confidence: 99%

Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Kubo

Saito

Osaka

et al. 2019

Metals

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“…Therefore, it is expected to be used for automotive and train parts for the shock-absorbing properties, construction materials for the sound and thermal insulation properties, and milling machines to improve the vibration-damping properties [4][5][6][7][8][9][10]. Aluminum foam has been attempted to be fabricated from various aluminum alloys, such as pure aluminum [11][12][13][14][15][16][17][18], Al-Cu aluminum alloy [19,20], Al-Si aluminum alloy [21][22][23][24][25], Al-Mg aluminum alloy [26][27][28][29], Al-Mg-Si aluminum alloy [23,[30][31][32][33][34], Al-Zn-Mg Aluminum alloy [19,35,36], etc., and various properties can be obtained by changing the base aluminum alloy. Therefore, multi-layer aluminum foam can be fabricated by varying the alloy type of the base aluminum alloy within a single aluminum foam to achieve multiple properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Two-Layer Aluminum Foam Consisting of Dissimilar Aluminum Alloys Using Optical Heating

Hangai,

Takagi,

Goto

et al. 2024

Materials

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Aluminum foam is a lightweight material and has excellent shock-absorbing properties. Various properties of aluminum foam can be obtained by changing the base aluminum alloy. Multi-layer aluminum foam can be fabricated by varying the alloy type of the base aluminum alloy, but with different foaming temperatures, within a single aluminum foam to achieve multiple properties. In this study, we attempted to fabricate a two-layer aluminum foam with the upper layer of a commercially pure aluminum A1050 foam and the lower layer of an Al-Si-Cu aluminum alloy ADC12 foam by using an optical heating device that can heat from both the upper and lower sides. Two types of heating methods were investigated. One is to directly stack the A1050 precursor coated with black toner on top of the ADC12 precursor and to foam it from the top and bottom by optical heating. The other is to place a wire mesh between the ADC12 precursor and the A1050 precursor and place the A1050 precursor on the wire mesh, thereby creating a space between the precursors, which is then foamed by optical heating from the top and bottom. It was shown that both precursors can be foamed and joined, and a two-layer A1050/ADC12 foam can be fabricated for both types of heating methods. In the method in which two precursors were stacked and foamed, even if the light intensity of the halogen lamps on the top and bottom were adjusted, heat conduction occurred between the stacked precursors, and the foaming of each precursor could not be controlled, resulting in tilting of the joining interface. In the method of foaming using a wire mesh with a gap between two precursors, it was found that by adjusting the light intensity, the two precursors can be foamed almost simultaneously and achieve similar pore structures. The joining interface can also be maintained horizontally.

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“…However, to our understanding, no literature is available on the Al-Zn metallic foams fabricated by the space holder powder metallurgy route. The only literature currently available on Al-Zn foams is based on the melt route [33][34][35] and hence a need to conduct this study.…”

Section: Introductionmentioning

confidence: 99%

B₄C‐Reinforced Al–Zn Foams Having Superior Energy Absorption Efficiency

et al. 2022

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The low density of the aluminium foam and high energy absorption make them favourable for automobile, aerospace, and defence industries. However, the melt route for foam fabrication has challenges in achieving homogeneous distribution of pores. Hence, we have adopted the space holder technique using the powder metallurgy methodology to overcome such a challenge. In the current study, we fabricated Al–Zn alloy foams reinforced with varying volume fractions of B4C particles using NaCl as a space holder implemented by hot pressure‐assisted sintering and dissolution. X‐ray computed tomography revealed a homogeneous distribution of pores. The quasistatic compression studies showed that the samples containing a higher volume fraction of pores exhibited higher energy absorption efficiency in the fabricated foam. The maximum energy absorption efficiency (η) achieved was ≈93% for the pristine Al alloy foam with ≈50% porosity, which is ≈11% higher than the η value of 9 vol% B4C samples with similar porosity. Additionally, B4C particles delay the sudden collapse of cell walls and stabilize the compression behaviour. Adding B4C improves the η and strength at higher relative density. This fabrication methodology would help us develop foams with a homogenous pore distribution and regular geometry, achieving highly desirable mechanical properties.

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Fabrication of foams of A2024 and A7075 and influence of porosity and heat treatment on their mechanical properties

Cited by 5 publications

References 6 publications

Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Fabrication of Two-Layer Aluminum Foam Consisting of Dissimilar Aluminum Alloys Using Optical Heating

B₄C‐Reinforced Al–Zn Foams Having Superior Energy Absorption Efficiency

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Fabrication of foams of A2024 and A7075 and influence of porosity and heat treatment on their mechanical properties

Cited by 5 publications

References 6 publications

Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Effect of Primary Crystals on Pore Morphology during Semi-Solid Foaming of A2024 Alloys

Fabrication of Two-Layer Aluminum Foam Consisting of Dissimilar Aluminum Alloys Using Optical Heating

B4C‐Reinforced Al–Zn Foams Having Superior Energy Absorption Efficiency

Contact Info

Product

Resources

About

B₄C‐Reinforced Al–Zn Foams Having Superior Energy Absorption Efficiency