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

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

doi:10.3390/ma7032382

Cited by 16 publications

(8 citation statements)

References 38 publications

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“…According to the porosity levels, porous materials can be classified into three categories: more than 70%, 10% to 70% and less than 10%. Mechanical models of the high-percentage category, which are usually foam and cellular materials [ 6 ], cannot be used in cast steels, because the basic assumption is totally different. When dealing with the low-percentage category, it is always assumed that voids are isolated from each other [ 7 ], or uniformly distributed [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Porosity Defect Remodeling and Tensile Analysis of Cast Steel

Sun

Liao

et al. 2016

Materials

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Tensile properties on ASTM A216 WCB cast steel with centerline porosity defect were studied with radiographic mapping and finite element remodeling technique. Non-linear elastic and plastic behaviors dependent on porosity were mathematically described by relevant equation sets. According to the ASTM E8 tensile test standard, matrix and defect specimens were machined into two categories by two types of height. After applying radiographic inspection, defect morphologies were mapped to the mid-sections of the finite element models and the porosity fraction fields had been generated with interpolation method. ABAQUS input parameters were confirmed by trial simulations to the matrix specimen and comparison with experimental outcomes. Fine agreements of the result curves between simulations and experiments could be observed, and predicted positions of the tensile fracture were found to be in accordance with the tests. Chord modulus was used to obtain the equivalent elastic stiffness because of the non-linear features. The results showed that elongation was the most influenced term to the defect cast steel, compared with elastic stiffness and yield stress. Additional visual explanations on the tensile fracture caused by void propagation were also given by the result contours at different mechanical stages, including distributions of Mises stress and plastic strain.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Porosity Defect Remodeling and Tensile Analysis of Cast Steel

Sun

Liao

et al. 2016

Materials

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“…The high brittleness of ADC12 alloy has been the main drawback for several applications. [28,29] Figure 3b shows strain-stress curves for ADC12 alloy and Al-Si-Gr composite. These results suggest that rGO as a reinforcement phase to ADC12 alloy substantially enhanced the ductility and toughness.…”

Section: Resultsmentioning

confidence: 99%

Reinforcing the Near Eutectic Aluminum–Silicon Alloy with Graphene: An Approach toward Self‐Lubricating Composite

Singh

Kumar

et al. 2020

Adv Eng Mater

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Mechanical and physical properties of aluminum alloys make them suitable for automotive and other structural applications. The high silicon content in aluminum improves the hardness to a great extent but at the cost of ductility. Herein, the reinforcement of near eutectic Al–Si (ADC12) alloy with the reduced graphene oxide (rGO) is demonstrated. The ADC12 alloy and its composite with rGO are cast using the gravity stir die‐casting process. The structural, mechanical, metallurgical, and tribological characteristics are conducted to understand the role of rGO as a reinforcement phase. The 0.7 wt% rGO as a reinforcement phase to ADC12 alloy reduces the friction and wear volume by 50% and ≈90%, respectively, whereas it improves the hardness by 27%. The high‐resolution transmission electron microscopy (TEM) image reveals the wrapping of microstructural silicon by rGO, which inhibits the growth of primary silicon and improves the interfacial strengthening. The high mechanical strength and low shearing properties of rGO, uniform dispersion in the ADC12 alloy, and restrained growth of primary silicon make the ADC12 alloy‐based composites potential materials for structural and low‐frictional building blocks in a diversified range of applications.

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

Cited by 16 publications

References 38 publications

RETRACTED: Porosity Defect Remodeling and Tensile Analysis of Cast Steel

RETRACTED: Porosity Defect Remodeling and Tensile Analysis of Cast Steel

Reinforcing the Near Eutectic Aluminum–Silicon Alloy with Graphene: An Approach toward Self‐Lubricating Composite

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

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