Nondestructive observation of pores during press forming of aluminum foam by X-ray radiography

Hangai, Yoshihiko; Kawato, Daisuke; Ando, Mizuki; Ohashi, Masataka; Morisada, Yoshiaki; Ogura, Takuya; Fujii, Hidetoshi; Nagahiro, Ryohei; Amagai, Kenji; Utsunomiya, Takao; Yoshikawa, Nobuhiro

doi:10.1016/j.matchar.2020.110631

Cited by 26 publications

(11 citation statements)

References 32 publications

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“…Recently, the technique of press forming of softened aluminum foam during or immediately after the foaming of the precursor was developed [17,18]. In the press forming process, first, the precursor was heat-treated using halogen lamps.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Two-Layered Aluminum Foam with Closed-Cell and Open-Cell Structures and Shaping of Closed-Cell Layer by Press Forming Immediately after Foaming

Hangai

Ando

Ohashi

et al. 2021

Metals

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Two-layered aluminum foam consisting of both closed and open cells is expected to improve the functionality of aluminum foam, because the cells have different morphologies and characteristics. In this study, press forming of the closed-cell layer of the two-layered aluminum foam immediately after foaming was performed to shape the closed-cell layer. By measuring the temperatures of the two layers during foaming, we found that it is necessary to use aluminum alloy with a higher melting point for the open-cell layer than that for the closed-cell layer to foam the closed-cell layer. In the press forming experiments, the closed-cell layer could be shaped by press forming while the shape of the open-cell layer was maintained.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Two-Layered Aluminum Foam with Closed-Cell and Open-Cell Structures and Shaping of Closed-Cell Layer by Press Forming Immediately after Foaming

Hangai

Ando

Ohashi

et al. 2021

Metals

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“…In particular, for the lattice structure aluminum alloys with low apparent density and high deformability (attributed to the periodic arrangement of lattice cells) are expected to be used in the crumple zones of automobiles [19][20][21]. However, because of the potential applications of a porous aluminum alloy in aerospace, automotive, and marine industries, indicating that the material can withstand certain deformation loads such as group bird strikes and vehicle collisions [22,23]. Therefore, it is crucial to investigate the deformation behaviour of this alloy under normal conditions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and compressive properties of Al‐Si10‐Mg lattice structures manufactured using selective laser melting

Huo

Zhao

Bai

et al. 2021

Materialwissenschaft Werkst

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In this study, the aluminum alloy lattice structure was processed using selective laser melting, and the compressive behaviour was studied. When the porous aluminum alloy was compressed along the building direction, the compressive stress initially increased, followed by a decrease, and then another increase. The aluminum alloy lattice structure mainly underwent the stages of elasticity, shearing, collapse, and then densification in the course of the compression process; the fracture primarily occurred at the joints of the pillars and the support plates. Moreover, the fractures of the aluminum alloy lattice structure, as prepared by selective laser melting, exhibited dimples of different sizes and shapes. The silicon content at the bottom of such a dimple was higher than that at the edges. When the stress level reached its limit and was insufficient to coordinate the plastic deformation of the two phases (α‐aluminum / silicon interface), micro‐pores formed at the interface (the dimples resulted from the breakage of numerous micro‐pores after aggregation), which caused the silicon content at the bottom of the dimple to be higher than that at the edge.

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“…Recently, the press forming of aluminum foam immediately after foaming but before solidification has been proposed [10][11][12]. In this forming process, the precursor can be directly heated because of the absence of the mold, and the cooling rate is high owing to the use of a cold die as the press-forming die.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the surface of the die can be transferred to the aluminum foam while retaining the pores by press forming immediately after foaming [10]. In our previous study [11], X-ray transmission was attempted as a means of observing pores during press forming to confirm their retention without collapsing during press forming. However, several pores overlapped in their projection on X-ray transmission images.…”

Section: Introductionmentioning

confidence: 99%

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

Hangai

Kawato

Ohashi

et al. 2021

Metals

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Forming aluminum foam to the desired shape while retaining its pore structures is essential for manufacturing aluminum foam products. Recently, a press forming process for aluminum foam that is performed after precursor foaming but before solidification has been proposed. In this study, to track individual pores throughout press forming immediately after foaming, X-ray radiography inspection was applied. A thin precursor was used, and foaming was constrained to the X-ray transmission direction. It was shown that, although some pores coalesced with other pores, the pores did not collapse during press forming. In addition, the porosity of aluminum foam evaluated from X-ray transmission images was constant during press forming. Some pores retained their shape during press forming but their position was changed by the material flow generated by press forming. These results show that by press forming before the solidification of aluminum foam, aluminum foam can be shaped without the collapse of pores.

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Nondestructive observation of pores during press forming of aluminum foam by X-ray radiography

Cited by 26 publications

References 32 publications

Fabrication of Two-Layered Aluminum Foam with Closed-Cell and Open-Cell Structures and Shaping of Closed-Cell Layer by Press Forming Immediately after Foaming

Fabrication of Two-Layered Aluminum Foam with Closed-Cell and Open-Cell Structures and Shaping of Closed-Cell Layer by Press Forming Immediately after Foaming

Microstructure and compressive properties of Al‐Si10‐Mg lattice structures manufactured using selective laser melting

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

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