Developing high-strength ultrafine-grained pure Al via large-pass ECAP and post cryo-rolling

Wang, Guowei; Song, Dandan; Zhou, Zhikai; Liu, Yi; Liang, Ningning; Wu, Yuna; Ma, Aibin; Jiang, Jinghua

doi:10.1016/j.jmrt.2021.09.085

Cited by 18 publications

(2 citation statements)

References 68 publications

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“…A large number of methods have been proposed for the production of superior metal materials. Among them, the preparation of ultra-fine-grained (UFG) metallic materials is of particular interest [1]. Compared with conventional materials, UFG metallic materials have excellent properties, such as high strength [2], high toughness, high corrosion resistance [3], high machinability, excellent strong plasticity matching, high fracture impedance [4], etc.…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics of Asymmetric Gradient Extrusion in Preparing Ultra-Fine-Grained Bulk Materials

Fan,

Li,

Liu

et al. 2023

Processes

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In this paper, a novel method for the preparation of ultra-fine-grained bulk materials called asymmetric gradient extrusion (AGE) is proposed. In AGE, the cross-section of the extrusion channel is a rectangle, and two inclined planes are staggered along the extrusion direction. To realize repetitive extrusion, the thickness of the workpiece is limited to be equal to the width of the channel outlet. In order to study the mechanism of ultra-fine grain formation in AGE, the deformation characteristics of AGE were investigated. First, the slip line field method was used to theoretically analyze the deformation characteristics and grain splitting in AGE. Then, the plastic deformation behavior of bulk samples in AGE and traditional extrusion was investigated and compared with the finite element method. In addition, the deformation characteristic and microstructure variation of pure copper bulk samples in AGE were experimentally investigated. The results showed that the deformation characteristics of workpieces were highly related to the two inclined planes within the die channel. Two independent deformation zones can be formed with increasing distance between the two inclined planes. The shear effects in each deformation zone lead to grain splitting during extrusion. Compared with traditional extrusion, the advantage of AGE is its amazing ability to form high and uniform strain during extrusion, which leads to the formation of small and uniform grains in the workpiece. After six passes of AGE, an average grain size of 0.6 μm can be achieved. The enhancement and accumulation of dislocations within grains was the dominating mechanism of grain fragmentation. AGE shows impressive potential in the preparation of ultra-fine-grained bulk materials.

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Section: Introductionmentioning

confidence: 99%

Deformation Characteristics of Asymmetric Gradient Extrusion in Preparing Ultra-Fine-Grained Bulk Materials

Fan,

Li,

Liu

et al. 2023

Processes

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show abstract

“…To improve the mechanical properties of various metals, equal channel angular pressing (ECAP) or equal channel angular extrusion (ECAE) are often used, mainly because of the refinement of microstructure and increased dislocation density [20][21][22]. For additively manufactured (AM) parts, ECAP has another advantage-it can significantly reduce their porosity [23]. However, this technique also has some disadvantages: inhomogeneity in strain distribution, complicated tooling, and high labor cost.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP)

et al. 2022

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With the aim of improving the excellent mechanical properties of the SLM-produced AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing). In our article, two different post-processing strategies were investigated: (1) low-temperature annealing (LTA) and subsequent ECAP processing at 150 °C; (2) no heat treatment and subsequent ECAP processing at 350 °C, 400 °C and 450 °C. The microstructure and mechanical properties of this alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing (LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial breakup of the Si network and observed nucleation of β-Si precipitates throughout the Al matrix. This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the microstructural evolution and mechanical properties of the alloy.

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Effects of Working Temperature on Microstructure and Hardness of Ti-6Al-4V Alloy Subjected to Asymmetrical Rolling

Sahoo

Mahapatra

Vundavilli

et al. 2023

J. of Materi Eng and Perform

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Developing high-strength ultrafine-grained pure Al via large-pass ECAP and post cryo-rolling

Cited by 18 publications

References 68 publications

Deformation Characteristics of Asymmetric Gradient Extrusion in Preparing Ultra-Fine-Grained Bulk Materials

Deformation Characteristics of Asymmetric Gradient Extrusion in Preparing Ultra-Fine-Grained Bulk Materials

Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP)

Effects of Working Temperature on Microstructure and Hardness of Ti-6Al-4V Alloy Subjected to Asymmetrical Rolling

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