Compression Properties of Al/Al&amp;ndash;Si&amp;ndash;Cu Alloy Functionally Graded Aluminum Foam Fabricated by Friction Stir Processing Route

Hangai, Yoshihiko; Saito, Kazutomo; Utsunomiya, Takao; Kitahara, Soichiro; Kuwazuru, Osamu; Yoshikawa, Nobuhiro

doi:10.2320/matertrans.m2012376

Cited by 33 publications

(10 citation statements)

References 22 publications

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“…Open-cell FG Al foams have been fabricated by a replication process with the volume fraction and size of the spacer varied to tailor the porosity and size of pores. 26) Closed-cell FG Al foams have been fabricated by a precursor route with the amount of blowing agent added to the precursor varied to tailor the porosity and size of pores 7,8) and with various alloy compositions in the precursor, 9,10) and by a syntactic foam route with various volume fractions of dispersed low-density hollow particles in the Al matrix. 11) However, there are few studies on the mechanical properties of FG Al foam that can realize both low plateau and high plateau stresses.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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Al foam is expected to be used as automotive components because of its light weight as well as its good energy absorption properties. When Al foam is applied to automotive components with complicated shapes, it is desirable to optimally distribute the low-plateau-stress and high-plateau-stress regions in a single Al foam, such as functionally graded (FG) Al foam, to realize components with superior and efficient energy absorption properties. In this study, two types of closed-cell FG Al foam, one composed of larger-smaller-larger three layers with different porosity and pore size to indicate lower-higher-lower plateau stress, and the other composed of smaller-larger-smaller three layers with different porosity and pore size to indicate higher-lower-higher plateau stress, were fabricated by varying the amount of blowing agent added. It was shown that the large-porosity and large-pore-size layers first deformed and, thereafter, the layers with small porosity and pore size deformed, regardless of the location of the large-porosity and large-pore-size layers in the compression test specimens. It was also shown that the first (lower) and second (higher) plateau regions appeared independently, which corresponds to the pore structures of each layer. Therefore, it was demonstrated that the plateau stress of Al foam can be controlled by varying the pore structures.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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“…He et al [19] prepared FG aluminium foams by coupling the foaming process and the cooling process of the direct foaming method. Hangai et al [20] fabricated FG aluminium foams with the friction stir processing route and conducted tests to reveal their compressive response. Hassani et al [21] also successfully produced aluminium foams with graded cell size and density, and measured their mechanical properties.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams

Chen

Yang

Kitipornchai

2017

Composites Science and Technology

327

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The nonlinear free vibration and postbuckling behaviors of multilayer functionally graded (FG) porous nanocomposite beams that are made of metal foams reinforced by graphene platelets (GPLs) are investigated in this paper. The internal pores and GPL nanofillers are uniformly dispersed within each layer but both porosity coefficients and GPL weight fraction change from layer to layer, resulting in position-dependent elastic moduli, mass density and Poisson's ratio along the beam thickness. The mechanical property of closed-cell cellular solids is employed to obtain the relationship between coefficients of porosity and mass density. The effective material properties of the nanocomposite are determined based on the Halpin-Tsai micromechanics model for Young's modulus and the rule of mixture for mass density and Poisson's ratio. Timoshenko beam theory and von Kármán type nonlinearity are used to establish the differential governing equations that are solved by Ritz method and a direct iterative algorithm to obtain the nonlinear vibration frequencies and postbuckling equilibrium paths of the beams with different end supports. Special attention is given to the effects of varying porosity coefficients and GPL's weight fraction, dispersion pattern, geometry and size on the nonlinear behavior of the porous nanocomposite beam. It is found that the addition of a small amount of GPLs can remarkably reinforce the stiffness of the beam, and the its nonlinear vibration and postbuckling performance is significantly influenced by the distribution patterns of both internal pores and GPL nanofillers.

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“…Functionally graded (FG) foams with multiple plateau stress and controlled deformation have also been fabricated using FSP. The ability of FSP to produce seamless joints between two different alloy precursors has been exploited to produce FG foams using alloys A1050-A6061 [11][12][13], ADC12 [14] and A1050-ADC12 [15] respectively. In the case of ADC12, FG foam precursors were fabricated by joining a set of plates with a foaming agent to those without a foaming agent, such that the porosity content varies along the length of the precursor.…”

Section: Introductionmentioning

confidence: 99%

Foaming of friction stir processed Al/MgCO₃ precursor via flame heating

Shandley

Maheshwari

Siddiquee

et al. 2020

Mater. Res. Express

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In the recent years, metal foams have become promising candidate materials in the engineering sector owing to their light weight and excellent energy absorption properties. Friction stir processing (FSP) has emerged as a cost-effective route to fabricate metal foam precursors from bulk substrates. Although the short processing time in FSP is able to provide high productivity, the cost of the foaming agent, TiH 2 in the case of aluminum foams is still high. This paper introduces flame heating to achieve localized foaming of aluminum alloy AA5754 to explore the possibility of using magnesium carbonate as a foaming agent stirred using multi-pass FSP. A specially designed slot based strategy using two plates arranged in lap configuration is devised to stir the foaming agent and understand the material movement after each subsequent pass. Microscopy techniques were carried out to evaluate the distribution of the foaming agent after each pass and the resulting microstructure of the processed plates as well as the morphology of the foamed sample. EDX results showed higher Mg and O content around the pore walls.

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Compression Properties of Al/Al–Si–Cu Alloy Functionally Graded Aluminum Foam Fabricated by Friction Stir Processing Route

Cited by 33 publications

References 22 publications

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

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

Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams

Foaming of friction stir processed Al/MgCO₃ precursor via flame heating

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Compression Properties of Al/Al&ndash;Si&ndash;Cu Alloy Functionally Graded Aluminum Foam Fabricated by Friction Stir Processing Route

Cited by 33 publications

References 22 publications

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

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

Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams

Foaming of friction stir processed Al/MgCO3 precursor via flame heating

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Product

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Compression Properties of Al/Al–Si–Cu Alloy Functionally Graded Aluminum Foam Fabricated by Friction Stir Processing Route

Foaming of friction stir processed Al/MgCO₃ precursor via flame heating