Inhomogeneity in strain, microstructure and mechanical properties of AA1050 alloy during twist extrusion

Kalahroudi, Faezeh Javadzadeh; Eivani, A.R.; Jafarian, H.R.; Amouri, A.; Gholizadeh, Reza

doi:10.1016/j.msea.2016.04.087

Cited by 27 publications

(4 citation statements)

References 11 publications

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“…An analogous pattern is also observed across the TS contours, as revealed in Figure 16c compared to Figure 16a,b. This is associated with the accumulation of strain and the subsequent homogenous multiplication of dislocations as a function of multiple-pass processing, which leads to hardness value proliferation and enhanced homogeneity across the MSCTE and TE extrudates [19,44,45]. Additionally, the increase of the recorded Hv values due to the increase in the imposed strain from increasing the number of passes is in good agreement with Figure 10.…”

Section: Grain Structuresupporting

confidence: 77%

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Fouad

El-Garaihy

Ahmed

et al. 2021

Metals

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This study presents a comprehensive evaluation of the effects of multi-channel spiral twist extrusion (MCSTE) processing on the mechanical properties and structural evolution of AA5083. The structural evolution and texture developed were mapped by electron backscatter diffraction (EBSD) for three successive passes and compared with an as-annealed plate. An evaluation of the hardness and tensile properties was presented and correlated with the EBSD findings. The displayed EBSD results revealed that grain refinement was strongly associated with the presence of a high density of low-angle grain boundaries (LAGBs) after one pass, which developed into fine grains of less than 20 μm and high-angle grain boundaries (HAGBs) after three MCSTE passes. The three pass processing led to a 65% reduction in grain size. This reduction in grain size was coupled with an enhancement in the hardness and tensile properties. Additionally, the crystallographic texture study represented a slightly random texture due to the presence of intermetallic particles in AA5083. This study demonstrates the efficacy of MCSTE as a grain refinement tool.

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Section: Grain Structuresupporting

confidence: 77%

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Fouad

El-Garaihy

Ahmed

et al. 2021

Metals

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“…Slip line field (SLF) analysis is a traditional theoretical method for analyzing metalforming characteristics. With the SLF solution, the extrusion mechanism through a wedgeshaped die has been well studied by many scholars [19,25]. Due to the similarity of die apertures, the SLF of AGE can be deduced, as is shown in Figure 3.…”

Section: Mechanism Of Grain Fragmentation In Agementioning

confidence: 99%

“…Another important area of research on SPD is the development of techniques to realize the intense plastic deformation of metals. Since SPD was first introduced as an effective approach to produce UFG metals in the 1980s [8,12], tremendous efforts have been exerted to develop SPD techniques, such as equal channel angle pressing (ECAP) [13,14], high-pressure torsion (HPT) [15,16], accumulated roll bonding (ARB) [17,18], multi-directional forging (MDF) [19,20], cyclic extrusion compression (CEC) [21,22], repetitive corrugation and straightening (RCS) [23,24], twist extrusion (TE) [25,26], constrained groove pressing (CGP) [27,28], and so on.…”

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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“…Despite high strength to weight ratio in UFG metals produced by SPD methods, elongation decrease is a major problem [17][18][19][20][21]. Rahmatabadi and Hashemi [2] evaluated the mechanical properties and forming limit diagrams (FLDs) of ultrafine-grained aluminum strips fabricated by accumulative roll bonding (ARB) at room temperature.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the mechanical properties and forming limit diagram of Al 5083 produced by equal channel angular rolling

Bozcheloei

Sedighi

Hashemi

2019

Int J Adv Manuf Technol

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The primary purpose of this research is investigating the effect of increasing temperature on mechanical properties and formability of Al 5083 produced by equal channel angular rolling (ECAR) process. The present work also aims to study the feasibility of increasing temperature as an approach for solving the ductility problem of ultrafine-grained Al 5083, although some strength of the material might be sacrificed. So, the quantitative and qualitative analysis of the effect of temperature increase on mechanical properties and formability has been done. In this paper, the ECAR process has been performed at three different temperatures (i.e., 25℃, 200℃, and 300℃). Then, the investigation of mechanical properties such as yield strength, ultimate tensile strength, and micro-hardness after each pass of the ECAR at different temperatures has been performed. The results showed that by applying the ECAR process at a specified temperature, the mechanical and micro-hardness properties of the samples improved, while elongation to fracture reduced. At ambient temperature, and after the 3 rd pass of the ECAR process, yield strength, ultimate tensile strength, and micro-hardness compared to the annealed sample increased by 94%, 19%, and 52%, respectively. Also, the mechanical properties of samples after the ECAR process in a specified pass at different temperatures have been evaluated. The obtained results showed that by increasing temperature, the yield strength, ultimate tensile strength and micro-hardness of the samples decreased, but the elongation to fracture as well as the forming limit diagram (FLD) improved. The results illustrated that by applying the ECAR process at a specified temperature, the level of the FLDs moved downward. Also, the FLDs after the 3 rd pass of the ECAR at different temperature have been compared. The results showed that the FLD0 (the major forming limit strain in-plane strain mode) at a temperature of 200℃ and 300℃ compared to the ambient temperature increased by 5% and 20%, respectively.

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Inhomogeneity in strain, microstructure and mechanical properties of AA1050 alloy during twist extrusion

Cited by 27 publications

References 11 publications

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

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

The effect of temperature on the mechanical properties and forming limit diagram of Al 5083 produced by equal channel angular rolling

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