The impact of severe plastic deformations obtained by hydrostatic extrusion on the machinability of ultrafine-grained AA5083 alloy

Skiba, J.; Kossakowska, Joanna; Kulczyk, Mariusz; Pachla, W.; Przybysz, Sylwia; Smalc-Koziorοwska, Julita; Przybysz, Mariusz

doi:10.1016/j.jmapro.2020.09.023

Cited by 17 publications

(8 citation statements)

References 16 publications

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“…On the other hand, the UTS showed a slight improvement compared to the YS, which indicates that the 1-pass (β 30 • ) alloy's uniform plastic deformation zone is mainly dominated by subgrains (LAGB), which do not contribute significantly to the strain hardening effect associated with dislocation pinning at the grain boundaries (as shown in Figures 5 and 11), which agrees with the reported findings by EBSD analysis [19,47,48]. It is worth to mentioning here that, the slight increase of the UTS can be related to the strain hardening effect which resulted in the onset of necking soon after yielding and decreasing the nonuniform zone of the tensile curve which affected negatively the elongation of the processed AA5083 alloy which agreed with Iqbal et al [49] and Skiba et al [50]. In addition, the decrease in the elongation % of the 1-pass condition can be ascribed to the strain hardening of the metallic materials after yielding [19,51].…”

Section: Discussionsupporting

confidence: 90%

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: Discussionsupporting

confidence: 90%

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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“…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. Moreover, some of the UFG materials have shown good super-plasticity at low temperatures and high strain rates [5].…”

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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“…However, it is considered an impurity because it creates very brittle needles of the δ-Al 4 Si 2 Fe phase. Titanium promotes grain refinement in the casting process [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…The hydrostatic extrusion consolidated the powder metal to a near void-free state and produced a fibrous inner structure by elongating the coarse-grained clusters along the extrusion direction. Skiba et al [ 5 ] analysed the effect of the reduction in cutting forces of AA5085 aluminium alloy due to strain hardening of the material by HE. The Al-Mg alloy tested after cold cumulative HE was characterised by significant refining of the microstructure to a nanometric scale, which is responsible for a significant increase in yield stress and ultimate tensile stress compared to the undeformed material.…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

et al. 2022

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The aim of this study is to determine the influence of the amount of magnesium in Al-Mg alloys and strain rate on the grain refinement and mechanical properties of the material as determined in a dynamic tensile test. Hydrostatic extrusion was used to process the material. This method is not commonly used to impose severe plastic deformation of Al-Mg alloys. The article presents the results of static and dynamic strength tests on aluminium alloys subjected to plastic deformation in the hydrostatic extrusion process. Technically pure aluminium Al99.5 and three aluminium alloys with different magnesium content, Al-1Mg, Al-3Mg and Al-7.5Mg, were used in the tests. The samples were subjected to static tests using the uniaxial tensile test machine and dynamic tests using a rotary hammer. Compared to pure aluminium, increasing the magnesium content in Al-based alloys strengthened them in hydrostatic extrusion (logarithmic strain ε = 0.86) and caused an increase in the static ultimate tensile stress Rm, relative strain εr and the value of the yield stress. For strengthened aluminium alloys, an increase in the strain rate from 750 to 1750 s−1 caused an increase in the dynamic ultimate tensile stress from 1.2 to 1.9 times in relation to the static ultimate tensile stress. The increase in magnesium content results in the formation of a larger strengthening phase, influences a different state of stress during dynamic loading and leads to a change in the orientation of the fracture surface. It was also found that an increase in magnesium content is associated with an increased number of voids, which is also directly proportional to the strain rate in the dynamic rotary hammer test.

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The impact of severe plastic deformations obtained by hydrostatic extrusion on the machinability of ultrafine-grained AA5083 alloy

Cited by 17 publications

References 16 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

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

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