On achieving superior strength for Al–Mg–Zn alloy adopting cold ECAP

Elhefnawey, Maged; Shuai, G.L.; Li, Z.; Nemat-Alla, M.; Zhang, D.T.; Li, L.

doi:10.1016/j.vacuum.2020.109191

Cited by 35 publications

(8 citation statements)

References 43 publications

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“…Thus, the dislocation density in the deformed samples increased with as we did more ECAP passes, both due to dislocation multiplication or the formation of new dislocations. The conclusive result afterwards was that the motion of a dislocation was hindered by the presence of other dislocations due to reasons explained above, which agreed with the discovered significant increase of hardness after ECAP processing (Huang et al, 2020;Elhefnawey et al, 2020;Ma et al, 2019;Yuan et al, 2019;Yang et al, 2019).…”

Section: Hardness Variationsupporting

confidence: 78%

A Computational Investigation into the Effect of Equal Channel Angular Processing on the Mechanical Properties of Severely Deformed ZK 60 Alloy Validated by Experiments

Almenaif¹,

Alhumaydani²,

Alnafisah³

et al. 2020

American Journal of Engineering and Applied Sciences

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In this study, the response surface method and finite-element analysis were employed to model the ECAP processing for biodegradable magnesium alloy ZK 60 behavior at 250°C. Using Finite-Element (FE) analysis data was extracted and compared to the what was found by experimenting in order to investigate the effects of the ECAP processing parameters on the plastic deformation behavior of the ECAPed samples. The effective strain and stresses as a function of the number of passes were investigated. Hardness contour maps perpendicular to ECAP direction were plotted. Compressive properties of the billets were also examined. The FE analysis revealed that the maximum stresses were displayed at the corner and peripheral areas compared to the central areas. Moreover, straining through two passes of route Bc displayed maximum effective strain of 2.75 recorded in the top peripheral regions, whereas the central regions displayed 1.25. In addition, ECAP processing via 2-Bc correlated with rises in Hv values in the samples peripheries by 125.4% respectively, when compared with the as-annealed conditions. The compression findings showed also significant enhancement of the compressive strength compared to the as-annealed counterparts.

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Section: Hardness Variationsupporting

confidence: 78%

A Computational Investigation into the Effect of Equal Channel Angular Processing on the Mechanical Properties of Severely Deformed ZK 60 Alloy Validated by Experiments

Almenaif¹,

Alhumaydani²,

Alnafisah³

et al. 2020

American Journal of Engineering and Applied Sciences

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“…In addition, it is commonly known that for the materials with moderate SFE such as Cu, twining is an important deformation mechanism, which resulted in grain refinement in addition to the dislocation slip during ECAP processing. Accordingly, the UFG structured yielded from ECAP processing inhibits dislocation glide thus leading to strengthening the material according to the Hall-Petch equation [58,59]. As mentioned above, it is reasonable to conclude that the strengthening of ECAP samples is generally thought of as the refinement of grains, formation of twins and accumulation of dislocations [12].…”

Section: Mechanical Propertiesmentioning

confidence: 92%

Experimental and Numerical Investigation of the ECAP Processed Copper: Microstructural Evolution, Crystallographic Texture and Hardness Homogeneity

Alateyah

Ahmed

Zedan

et al. 2021

Metals

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The current study presents a detailed investigation for the equal channel angular pressing of pure copper through two regimes. The first was equal channel angular pressing (ECAP) processing at room temperature and the second was ECAP processing at 200 °C for up to 4-passes of route Bc. The grain structure and texture was investigated using electron back scattering diffraction (EBSD) across the whole sample cross-section and also the hardness and the tensile properties. The microstructure obtained after 1-pass at room temperature revealed finer equiaxed grains of about 3.89 µm down to submicrons with a high density of twin compared to the starting material. Additionally, a notable increase in the low angle grain boundaries (LAGBs) density was observed. This microstructure was found to be homogenous through the sample cross section. Further straining up to 2-passes showed a significant reduction of the average grain size to 2.97 µm with observable heterogeneous distribution of grains size. On the other hand, increasing the strain up to 4-passes enhanced the homogeneity of grain size distribution. The texture after 4-passes resembled the simple shear texture with about 7 times random. Conducting the ECAP processing at 200 °C resulted in a severely deformed microstructure with the highest fraction of submicron grains and high density of substructures was also observed. ECAP processing through 4-passes at room temperature experienced a significant increase in both hardness and tensile strength up to 180% and 124%, respectively.

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“…Bridgman, who received the Nobel Prize in Physics in 1946 [6] (this idea later resulted in the invention of the high pressure torsion (HPT) process [7][8][9]). The breakthrough in SPD processing came later, in the 1980s, when Dr. V. M. Segal introduced the method of equal channel angular pressing (ECAP) [10][11][12] to the world.…”

Section: Severe Plastic Deformation Processesmentioning

confidence: 99%

Decade of Twist Channel Angular Pressing: A Review

Macháčková

2020

Materials

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The methods of severe plastic deformation (SPD) have gained attention within the last decades primarily owing to their ability to substantially refine the grains within metallic materials and, therefore, significantly enhance the properties. Among one of the most efficient SPD methods is the equal channel angular pressing (ECAP)-based twist channel angular pressing (TCAP) method, combining channel twist and channel bending within a single die. This unique die affects the processed material with three independent strain paths during a single pass, which supports the development of substructure and efficiently refines the grains. This review is intended to summarize the characteristics of the TCAP method and its main features documented within the last decade, since its development in 2010. The article is supplemented with a brief characterization of other known SPD methods based on the combination of ECAP and twist extrusion (TE) within a single die.

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On achieving superior strength for Al–Mg–Zn alloy adopting cold ECAP

Cited by 35 publications

References 43 publications

A Computational Investigation into the Effect of Equal Channel Angular Processing on the Mechanical Properties of Severely Deformed ZK 60 Alloy Validated by Experiments

A Computational Investigation into the Effect of Equal Channel Angular Processing on the Mechanical Properties of Severely Deformed ZK 60 Alloy Validated by Experiments

Experimental and Numerical Investigation of the ECAP Processed Copper: Microstructural Evolution, Crystallographic Texture and Hardness Homogeneity

Decade of Twist Channel Angular Pressing: A Review

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