Effect of ECAP on microstructure, mechanical and tribological properties of aluminum and brass alloys: A review

Radhi, Hussein Naser; Aljassani, Alaa M.H.; Mohammed, Mohsin Talib

doi:10.1016/j.matpr.2020.02.497

Cited by 16 publications

(9 citation statements)

References 47 publications

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“…Equal channel angular pressing (ECAP) process was a shear deformation process in which polycrystalline samples were pressed into a specially designed mold to achieve a large amount of deformation. It was mainly through near-pure shear action during the deformation process to achieve grain refinement, thus significantly reinforcing the mechanical and physical properties of the material [56].…”

Section: Equal Channel Angular Pressingmentioning

confidence: 99%

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Recent Advances on Preparation Method of Ti-Based Hydrogen Storage Alloy

Liang¹,

Wang²,

Rong³

et al. 2020

MSCE

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Section: Equal Channel Angular Pressingmentioning

confidence: 99%

“…Schematic diagram of equal channel angular extrusion[56].ECAP was a kind of effective severe plastic deformation (SPD) technique for producing ultrafine crystalline materials. Studies have shown that the average grain size of the ultrafine alloy prepared by ECAP was close to 330 nm and the alloy synthetical performance was higher than that of hot-rolled[57].…”

mentioning

confidence: 99%

Recent Advances on Preparation Method of Ti-Based Hydrogen Storage Alloy

Liang¹,

Wang²,

Rong³

et al. 2020

MSCE

View full text Add to dashboard Cite

“…As the cross-section is symmetric, the sample can be rotated before reentry into the die. Critical ECAP process variables include the die angle, temperature, number of passes through the die, and whether or not the specimen is rotated between passes 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Upper-Bound Analysis for Equal Channel Angular Pressing (ECAP) with an Intersecting Channel Angle of 120°

et al. 2021

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The exact calculations of the stress and strain distributions based on the controlling equations for a forming process with large deformation are often difficult. To circumvent such difficulties, some analytical methods such upper-bound analysis and slip-line field theory have been established by making a number of simplifying assumptions regarding the material properties and deformation modes. In this work an analytical model based on the upper-bound theory was successfully developed to predict material flow pattern and maximum process loads for an Equal Channel Angular Pressing (ECAP) die with circular cross-section and an intersecting channel angle of 120°. Based on the model, the power dissipated on all frictional and velocity discontinuity surfaces were determined and optimized in order predict the maximum process force as function of the channel geometry and the material plastic behavior. To validate the developed model, the ECAP die were produced and used to determine experimental load-displacement curves of AA6061-T6 specimens with different lengths. A good correlation between theoretical and experimental results was observed. In addition, the constant friction factor demonstrated to have a strong effect on the relative extrusion pressure.

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“…Most failures in engineering components are initiated from the surface layer; therefore, surface treatments can play a crucial role in controlling the material performance and lifetime, as reported by Maleki et al [ 1 ]. The demand for improving the wear resistance of workpieces, e.g., by surface hardening in industries, is an attractive choice because the wear of engineering components can cause a high clearance, along with precision loss, in dynamic structural parts [ 2 ]. Surface treatments modify surfaces of parts without affecting the core of the material.…”

Section: Introductionmentioning

confidence: 99%

Novel Permanent Magnetic Surface Work Hardening Process for 60/40 Brass

et al. 2021

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Surface work hardening is a process of deforming a material surface using a thin layer. It hardens and strengthens the surface while keeping the core relatively soft and ductile to absorb stresses. This study introduces a permanent magnate surface work hardening under two opposite permanent poles of a magnet to investigate its influence on a brass surface. The gap between the brass and the north magnet pole—fixed in the spindle of a vertical machine—was filled with martensitic stainless steel balls. The rotational speed and feed rates were 500–1250 rpm and 6–14 mm min−1, respectively. The novel method improved the surface hardness for all parameters by up to 112%, in favor of high speed, and also increased yield by approximately 10% compared to ground samples. Surface roughness showed higher values for all speed–feed rate combinations compared to the ground sample. Nevertheless, it showed better roughness than other treated conditions with high and low feed rates. The ultimate tensile strength and ductility remained unchanged for all conditions other than the untreated brass. A factorial design and nonlinear regression analysis were performed to predict the microhardness equation and effectiveness of the independent variable—speed and feed rate—for the proposed process.

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Effect of ECAP on microstructure, mechanical and tribological properties of aluminum and brass alloys: A review

Cited by 16 publications

References 47 publications

Recent Advances on Preparation Method of Ti-Based Hydrogen Storage Alloy

Recent Advances on Preparation Method of Ti-Based Hydrogen Storage Alloy

Upper-Bound Analysis for Equal Channel Angular Pressing (ECAP) with an Intersecting Channel Angle of 120°

Novel Permanent Magnetic Surface Work Hardening Process for 60/40 Brass

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