Ultrafast fabrication of high-density Al–12Si compacts with gradient structure by electro-discharge sintering

Liang, Yihan; Xiang, Siqi; Li, Tongye; Zhang, Xinfang

doi:10.1016/j.jmapro.2020.03.013

Cited by 6 publications

(5 citation statements)

References 35 publications

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“…Powder metallurgy (PM) is a flexible technology for manufacturing near-clean shape products. Traditional powder metallurgy usually involves three main steps: mixing of the metal powder with a reinforcing agent, compaction, and sintering at high temperature [ 20 ]. However, due to the absence of local heating, conventional PM products have high porosity, which further reduces the performance of these products [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

et al. 2023

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In conventional ceramic–metal matrix composites, with the addition of the ceramic phase, although it can significantly improve the performance of the material in one aspect, it tends to weaken some of the excellent properties of the metal matrix as well. In order to meet the high toughness and high strength requirements of composites for practical production applications, researchers have searched for possible reinforcing structures from nature. They found that fractal structures, which are widely found in nature, have the potential to improve the mechanical properties of materials. However, it is often not feasible to manufacture these geometric structures using conventional processes. In this study, alumina ceramic fractal structures were prepared by 3D printing technology, and aluminum composites containing fractal ceramic structures were fabricated by spark plasma sintering technology. We have studied the effect of the fractal structure of alumina ceramics on the mechanical properties of composites. The compression strength of samples was measured by a universal testing machine and the torsional properties of samples were measured by a torsional modulus meter. The results show that a fractal structure improves the compressive strength of aluminum/alumina ceramic composites by 10.97% and the torsional properties by 17.45%. The results of the study will provide a new method for improving the mechanical properties of materials.

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Section: Methodsmentioning

confidence: 99%

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

et al. 2023

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“…In Shenyang, China, works were carried out from 2000 [76] to 2015 [57]. In addition, researchers from Beijing and Chegdu have recently started to use this technique [58,77]. In Changhua and Hsinchu (Taiwan) studies were carried out with low voltage discharges some years ago [78].…”

Section: Historical Development Of the Edc Processmentioning

confidence: 99%

“…The goal in these alloys was to obtain amorphous structures or thermally stable fine intermetallics with low diffusivity in Al [71]. More recent applications of EDC to Al powders include, for instance, the research in China with Al-12Si powders [77].…”

Section: Studied Materialsmentioning

confidence: 99%

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Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Aranda

Fernández

Lozano-Pérez

et al. 2021

Metals

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Manufacturing metallic materials from elemental or alloyed powders is an option in many industrial processes. Nevertheless, the traditional powder metallurgy processing including furnace sintering is at times detrimental for the microstructure attained in the powders. Alternative sintering processes based on the use of electricity and the energy obtained by the Joule effect in powder particles can be quick enough to avoid microstructural changes. In particular, when the energy is stored in a capacitor and then discharged, the heating process is extremely quick, lasting milliseconds or even microseconds. This process, generally known as electrical discharge consolidation, has been applied to a wide variety of metallic materials, easily preserving the original microstructure of the powders. Both porous or homogeneous and highly densified material can be obtained, and without losing the desired properties of the consolidated material. A general overview of the process and applications, as well as the results obtained by different research groups around the world, have been reviewed in this manuscript.

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“…Takashi Shintani et al [23] studied the change of dislocation with strain and calculated the dislocation characteristic parameters of cold-rolled 304 steel which showed that the strengthening mechanism in cold-rolled Type 304 steel changes with differences in the dislocation density between the γ and the α phase. Inspired by the gradient structures of biological materials, researchers have explored compositional and structural gradients as an approach to enhance the properties of metal materials [24,25]. Wang et al [26] studied the microstructures and properties of 6016 aluminum alloy with gradient compositions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Gradient Hot Rolled Deformation on Texture Evolution and Properties of 1561 Aluminum Alloy

Yang

Wang

et al. 2022

Crystals

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Through gradient hot rolling, a transition zone from the initial undeformed to 30% deformed microstructure was obtained in the 6 mm thick 1561 aluminum alloy hot rolled plate. The effect of gradient deformation on the evolution process of structure and texture characteristics to 1561 aluminum alloy were systematically investigated by X-ray diffractometer (XRD), optical microscope (OM), and electron back-scattered diffraction (EBSD) in this paper. The results showed that after gradient hot rolling, the grains were elongated along the rolled direction, and the average grain size decreased from 18.95 μm to 1.19 μm. After annealing, the average grain size decreased from 28.34 μm to 10.69 μm. The fraction of dynamic recrystallization is low in all cases. With the increase in gradient deformation, the fraction of the deformed texture (110) <100> Goss, (110) <112 > Brass and fiber texture increased under the action of shear strain, the hardness value of annealed 1561 aluminum alloy ranged from 83.8 HV up to as high as 104 HV, and the electrical conductivity (EC) value increased from 23.5% IACS to 24.3% IACS. Significantly, with the increment of the deformation, the dislocation density increases 2.4 × 1013 m−2 of the annealed hot rolled plates, which should be responsible for the hardness increase. While the structure of the alloy becomes more orderly, the EC increases. Work hardening, fine-grain strengthening and texture all influence the mechanical properties of the gradient hot rolled 1561 aluminum alloy plate.

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Ultrafast fabrication of high-density Al–12Si compacts with gradient structure by electro-discharge sintering

Cited by 6 publications

References 35 publications

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Effects of Gradient Hot Rolled Deformation on Texture Evolution and Properties of 1561 Aluminum Alloy

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