Improvement of Strength and Energy Absorption Properties of Porous Aluminum Alloy with Aligned Unidirectional Pores Using Equal-Channel Angular Extrusion

Yoshida, Teruo; Muto, Daiki; Tamai, Tomoya; Suzuki, Shinsuke

doi:10.1007/s11661-018-4584-5

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…In our previous study, Yoshida et al researched the grain size and dislocation density of porous aluminum alloy with unidirectionally aligned pores, which was solid-solutionized and then processed through ECAE. 16) In the study, the average grain size of the specimen after introducing ¾ ¼ 0:31 by ECAE was almost same as that of the solid-solutionized specimen without ECAE. On the other hand, the dislocation density of the specimen after introducing ¾ ¼ 0:31 by ECAE was larger than that of the solid-solutionized specimen without ECAE.…”

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

confidence: 62%

“…In our previous study, Yoshida et al reported that porous aluminum alloy with unidirectionally aligned pores was hardened by ECAE. 16) In the study, although the compressive yield strength was largely improved by introducing ¾ ¼ 0:3, introducing ¾ > 0:3 did not significantly improve the compressive yield strength relative to the amount of equivalent the plastic strain because dislocation density was nearly saturated above ¾ ¼ 1:2. 16) Therefore, the mechanical properties of the porous A6061 fabricated by Rod-dipping Process would be improved because the results of this study were similar to those of the previous one.…”

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

confidence: 77%

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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: 62%

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

confidence: 77%

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

et al. 2019

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“…On the other hand, the cellular architecture of unpressed 3D-printed wood has a stochastic porosity, and the double-pressed 3D-printed wood has a dense/compact nearly homogeneous structure. The regularly arranged pores and voids in natural balsa wood act as energy absorption sites ( 45 ), thus leading to large flexure strains. On the contrary, the mechanical response of the unpressed 3D-printed sample is complicated because of its stochastic porosity ( 46 ), and in this case, it has led to lower strength and ductility.…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional printing of wood

Thakur,

Shi,

Kearney

et al. 2024

Sci. Adv.

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Natural wood has served as a foundational material for buildings, furniture, and architectural structures for millennia, typically shaped through subtractive manufacturing techniques. However, this process often generates substantial wood waste, leading to material inefficiency and increased production costs. A potential opportunity arises if complex wood structures can be created through additive processes. Here, we demonstrate an additive-free, water-based ink made of lignin and cellulose, the primary building blocks of natural wood, that can be used to three-dimensional (3D) print architecturally designed wood structures via direct ink writing. The resulting printed structures, after heat treatment, closely resemble the visual, textural, olfactory, and macro-anisotropic properties, including mechanical properties, of natural wood. Our results pave the way for 3D-printed wooden construction with a sustainable pathway to upcycle/recycle natural wood.

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“…Yoshida et al applied equal-channel angular extrusion to the porous aluminum alloy with unidirectional pores to resolve that issue. 13) As a consequence, energy absorption efficiency was improved by introducing work hardening. Lotus-type porous metals have relatively small porosity, but other porous metals that have relatively thin cell walls have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

et al. 2020

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A drop in compressive stress in the plateau region is one of the issues in compressive behavior of porous metals since it has a negative effect on energy absorption efficiency. The compressive deformation behavior of porous aluminum with irregular unidirectional pores was investigated to clarify the mechanism of the drop. Compression tests of cubic specimens with various irregular circular pore geometries were performed. Digital image correlation and finite element analysis were also conducted to obtain strain and stress distribution of the surface perpendicular to the pores. Fracture of the cell walls was observed when the drop occurred. The results show that pore geometry has an effect on the number and the amount of drop in compressive stress. Measurement of an area of two nearest pores of the fractured cell walls suggests that the amount of drop in compressive stress increases as the area increases. Also, a calculation of normalized critical stress for the plastic collapse of the cell walls shows that the fractured cell walls tend to be geometrically weak. Furthermore, stress concentration occurred around the fractured cell walls, which resulted in a secondary fracture of the cell walls.

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Improvement of Strength and Energy Absorption Properties of Porous Aluminum Alloy with Aligned Unidirectional Pores Using Equal-Channel Angular Extrusion

Cited by 6 publications

References 14 publications

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

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

Three-dimensional printing of wood

Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

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