Compression Properties of Three-Layered Functionally Graded ADC12 Aluminum Foam Fabricated by Friction Stir Welding

Hangai, Yoshihiko; Kamada, Hiroto; Utsunomiya, Takao; Kitahara, Soichiro; Kuwazuru, Osamu; Yoshikawa, Nobuhiro

doi:10.2320/matertrans.me201312

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…Namely, the ADC12 foams exhibited brittle fracture, which is attributed to the Al-Si eutectic nature of the ADC12 Al alloy [ 32 – 34 ] used as the base material and the presence of oxide films. This brittle fracture of ADC12 foams is consistent with the compression tests reported in previous studies [ 15 , 24 – 26 ]. The Young’s modulus of the ADC12 foams slightly decreased as the porosity increased but remained almost constant for the range of porosities of the ADC12 foams obtained in this study.…”

Section: Resultssupporting

confidence: 92%

“…It has been shown that a porosity of approximately 50%–80% can be achieved using Al alloy die castings, which contain a large number of gas pores, without the use of a blowing agent [ 15 ]. In addition, the pores of the Al foam obtained using die castings without a blowing agent are smaller and have higher sphericity than those of Al foam fabricated using a blowing agent [ 15 , 24 – 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Tensile Properties and Fracture Behavior of Aluminum Alloy Foam Fabricated from Die Castings without Using Blowing Agent by Friction Stir Processing Route

et al. 2014

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Al foam has been used in a wide range of applications owing to its light weight, high energy absorption and high sound insulation. One of the promising processes for fabricating Al foam involves the use of a foamable precursor. In this study, ADC12 Al foams with porosities of 67%–78% were fabricated from Al alloy die castings without using a blowing agent by the friction stir processing route. The pore structure and tensile properties of the ADC12 foams were investigated and compared with those of commercially available ALPORAS. From X-ray computed tomography (X-ray CT) observations of the pore structure of ADC12 foams, it was found that they have smaller pores with a narrower distribution than those in ALPORAS. Tensile tests on the ADC12 foams indicated that as their porosity increased, the tensile strength and tensile strain decreased, with strong relation between the porosity, tensile strength, and tensile strain. ADC12 foams exhibited brittle fracture, whereas ALPORAS exhibited ductile fracture, which is due to the nature of the Al alloy used as the base material of the foams. By image-based finite element (FE) analysis using X-ray CT images corresponding to the tensile tests on ADC12 foams, it was shown that the fracture path of ADC12 foams observed in tensile tests and the regions of high stress obtained from FE analysis correspond to each other. Therefore, it is considered that the fracture behavior of ADC12 foams in relation to their pore structure distribution can be investigated by image-based FE analysis.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Tensile Properties and Fracture Behavior of Aluminum Alloy Foam Fabricated from Die Castings without Using Blowing Agent by Friction Stir Processing Route

et al. 2014

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“…In this study, an Al foam-filled steel tube was fabricated by friction welding, which was expected to realize the metal bonding between Al foam and a thin-wall steel tube. First, an Al foam precursor was fabricated using the FSW route, in which blowing agent powder was mixed in Al plates by FSW [ 18 , 19 ]. The obtained precursor was placed in the steel tube; thereafter, the precursor was bonded to the steel tube by friction welding.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Aluminum Foam-Filled Thin-Wall Steel Tube by Friction Welding and Its Compression Properties

et al. 2014

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Aluminum foam has received considerable attention in various fields and is expected to be used as an engineering material owing to its high energy absorption properties and light weight. To improve the mechanical properties of aluminum foam, combining it with dense tubes, such as aluminum foam-filled tubes, was considered necessary. In this study, an aluminum foam-filled steel tube, which consisted of ADC12 aluminum foam and a thin-wall steel tube, was successfully fabricated by friction welding. It was shown that a diffusion bonding layer with a thickness of approximately 10 μm was formed, indicating that strong bonding between the aluminum foam and the steel tube was realized. By the X-ray computed tomography observation of pore structures, the fabrication of an aluminum foam-filled tube with almost uniform pore structures over the entire specimen was confirmed. In addition, it was confirmed that the aluminum foam-filled steel tube exhibited mechanical properties superior to those of the ADC12 aluminum foam and steel tube. This is considered to be attributed to the combination of the aluminum foam and steel tube, which particularly prevents the brittle fracture and collapse of the ADC12 foam by the steel tube, along with the strong metal bonding between the aluminum foam and the steel tube.

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“…Figure 10 shows a schematic illustration of the fabrication process of the ADC12 precursor by the FSW route [ 29 , 30 ]. As the starting materials, ADC12 high-pressure die-cast plates of 3 mm thickness were used.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Aluminum Tubes Filled with Aluminum Alloy Foam by Friction Welding

et al. 2015

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Aluminum foam is usually used as the core of composite materials by combining it with dense materials, such as in Al foam core sandwich panels and Al-foam-filled tubes, owing to its low tensile and bending strengths. In this study, all-Al foam-filled tubes consisting of ADC12 Al-Si-Cu die-cast aluminum alloy foam and a dense A1050 commercially pure Al tube with metal bonding were fabricated by friction welding. First, it was found that the ADC12 precursor was firmly bonded throughout the inner wall of the A1050 tube without a gap between the precursor and the tube by friction welding. No deformation of the tube or foaming of the precursor was observed during the friction welding. Next, it was shown that by heat treatment of an ADC12-precursor-bonded A1050 tube, gases generated by the decomposition of the blowing agent expand the softened ADC12 to produce the ADC12 foam interior of the dense A1050 tube. A holding time during the foaming process of approximately tH = 8.5 min with a holding temperature of 948 K was found to be suitable for obtaining a sound ADC12-foam-filled A1050 tube with sufficient foaming, almost uniform pore structures over the entire specimen, and no deformation and minimum reduction in the thickness of the tube.

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Compression Properties of Three-Layered Functionally Graded ADC12 Aluminum Foam Fabricated by Friction Stir Welding

Cited by 10 publications

References 25 publications

Tensile Properties and Fracture Behavior of Aluminum Alloy Foam Fabricated from Die Castings without Using Blowing Agent by Friction Stir Processing Route

Tensile Properties and Fracture Behavior of Aluminum Alloy Foam Fabricated from Die Castings without Using Blowing Agent by Friction Stir Processing Route

Fabrication of Aluminum Foam-Filled Thin-Wall Steel Tube by Friction Welding and Its Compression Properties

Fabrication of Aluminum Tubes Filled with Aluminum Alloy Foam by Friction Welding

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