Strengthening of lotus-type porous copper by ECAE process

Lobos, Juan; Suzuki, Shinsuke; Utsunomiya, Hiroshi; Nakajima, Hideo; Rodrigez-Perez, M.A.

doi:10.1016/j.jmatprotec.2012.04.024

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…Figure 18 Previously, the hardness distribution of lotus-type porous copper by ECAE was measured. 13) The hardness was the hardest in region 1 crossing to the inner corner of the channel after the first pass. However, the hardness was lower in region 3 crossing to the outer corner of channel.…”

Section: Hardening Of Porous A6061 341 Ecae-processed Porous A6061mentioning

confidence: 98%

“…The distance between each pair of lattice points was 1 mm. The indentation was performed on the matrix under a testing force of 0.98 N and for a holding time of 10 s. The hardness distribution was measured on the cross section separated into five regions 13) as shown in Fig. 7.…”

Section: Hardness Testmentioning

confidence: 99%

“…Koh et al simultaneously fabricated and hardened porous copper using cold extrusion and removing aluminum as a sacrificial material. 9) Suzuki et al 12) and Lobos et al 13) hardened lotus-type porous copper by equal-channel angular extrusion (ECAE), as developed by Segal et al 14) However, the porosity of the samples decreased, and the hardness was distributed on the sample cross-sections because it was impossible to inset an insert material into all the pores. Suganuma et al 15) and Yoshida et al 16) demonstrated that porous aluminum alloys with pores containing insert materials could be strengthened by ECAE while maintaining alloy porosities and found that it was imperative to hold insert materials in pores during plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Porous Metals with Unidirectionally Aligned Pores by Rod-Dipping Process

et al. 2019

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Rod-dipping Process" was developed to simultaneously fabricate and strengthen porous metals with pore with unidirectionally aligned throughout their matrix. Carbon rods were dipped into a molten A6061 alloy, quenched, and processed by equal-channel angular extrusion (ECAE). The rods were subsequently removed, producing the porous metal throughout a metallic matrix. To determine the possibility of using our method to fabricate various porous metals, a theoretical equation was formulated for calculating the volume of hydrostatic pressure required for a molten metal to infiltrate the spaces between rods of various diameters and spaced at various intervals. The primary crystal was isotropic, and no reaction products were formed on the pore surfaces. Therefore, the crystal and pore growth directions could be independently controlled. By introducing an equivalent plastic strain of 1.2, the Vickers hardness values of the samples homogeneously increased to 1.5 times higher than that of the as-cast samples. Consequently, this method enabled us to fabricate porous metals with pore with unidirectionally aligned throughout their matrices and whose pore sizes, positions and volume fractions could be arbitrarily controlled. Furthermore, the metallic matrix could be simultaneously hardened by plastic deformation. [

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Section: Hardening Of Porous A6061 341 Ecae-processed Porous A6061mentioning

confidence: 98%

Section: Hardness Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of Porous Metals with Unidirectionally Aligned Pores by Rod-Dipping Process

et al. 2019

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“…By bulk metal forming, metallic foams lose advantages of lightweightness due to densi cation by pore closure. Utsunomiya et al 2) proposed that forming of metallic foams has advantages in (1) improvements in strength by work hardening 3) , (2) manufacturing mechanical components with complicated shapes 4) , (3) control of porosity and pore morphology 3) and (4) microstructure evolution with high fraction of high-angle grain boundaries 5) . Therefore, it is demanded to establish forming technologies of metallic foams for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Deformation and Density Change of Open-Cell Nickel Foam in Compression Test

2017

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Repeated compression test of open-cell type nickel foam (Celmet) was conducted to investigate deformation behavior with changes in density. Cylindrical billets with two pore sizes were compressed up to 90% in nominal strain. Apparent density, buoyant density and dimensions of billets were measured after each compression step. Compressive stress linearly increases without plateau region until the nominal strain of 0.4 with increase in apparent density and with slight increase in diameter. Apparent density and porosity estimated under assumption of no diameter change show good agreement with the experiments. Above the strain of 0.4, the stress as well as diameter apparently increases with remarkable increase in density.

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“…Their unique features include: (i) high thermal conductivity, (ii) controllable pore size and porosity, and (iii) high mechanical shock resistance. These metallic monoliths are expected to find uses in lightweight materials, catalyst supports, electrodes, vibration and acoustic energy damping materials, and impact energy absorption materials [13,14]. Fig.…”

Section: Introductionmentioning

confidence: 99%