Atef Hamada
University of Oulu
Ultimate tensile strengthRecrystallization (metallurgy)Composite materialFlow stressMartensiteMetallurgyGrain sizeMaterials scienceWeldingAustenitic stainless steelTwipElectron backscatter diffractionGrain boundaryLaserCrystal twinningAnnealing (metallurgy)PlasticityMicrostructureLaser beam weldingAustenite
58Publications
19H-index
1,116Citations
Publications 61
Newest
#1Ghalia A. Gaber (Al-Azhar University)H-Index: 2
#2Lamiaa Z. Mohamed (Cairo University)H-Index: 2
Last. Atef Hamada (University of Oulu)H-Index: 19
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Abstract null null Ce-doped TiO2 coatings were applied by electrodeposition on a low-nickel austenitic stainless steel (AISI 201) bearing 8 wt% Mn to improve the electrochemical properties in acidic chloride solutions. Characterization of the Ce-doped TiO2 coatings was performed by a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (EDS) to study the tiny features. The corrosion behavior of the bare and coated steel was evaluated in aqueous acidic chloride solution...
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#1Mikko HietalaH-Index: 4
#2Matias JaskariH-Index: 10
Last. Atef HamadaH-Index: 19
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In this study, ultra-high-strength steels, namely, cold-hardened austenitic stainless steel AISI 301 and martensitic abrasion-resistant steel AR600, as base metals (BMs) were butt-welded using a disk laser to evaluate the microstructure, mechanical properties, and effect of post-weld heat treatment (PWHT) at 250 °C of the dissimilar joints. The welding processes were conducted at different energy inputs (EIs; 50–320 J/mm). The microstructural evolution of the fusion zones (FZ) in the welded join...
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#1Walaa Abdel-Aziem (Zagazig University)H-Index: 3
#2Mohamed Hassan (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 27
Last. Atef Hamada (University of Oulu)H-Index: 19
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The micro-injection upsetting (MIU) experiments of commercially pure aluminium have been conducted on two groups of specimens with different grain structures. One group is of coarse grain (CG, unde...
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#1Walaa Abdel-Aziem (Zagazig University)H-Index: 3
#2Mohamed Hassan (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 27
Last. Atef Hamada (University of Oulu)H-Index: 19
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Commercially pure aluminum was deformed via the extrusion process at different strain rates considering the temperature rising during the deformation, i.e., with different Zener–Hollomon parameters (Z), to investigate the effect of Z on its grain structure and tensile properties in the micro/meso-scale. The results demonstrate that deformation-induced grain refinement was obtained by increasing the values of the Z. Besides, the dislocation density of the aluminum specimens increased with the str...
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#1Walaa Abdel-Aziem (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 3
#2Atef Hamada (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 19
Last. Mohamed Hassan (Assiut University)H-Index: 27
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The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-sec...
4 CitationsSource
#1Peter Nyanor (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 2
#2Omayma A. ElkadyH-Index: 13
Last. Mohamed Hassan (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 27
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Aluminum matrix composites reinforced with reduced graphene oxide (rGO) and hybrid of carbon nanotube (CNT) and rGO are fabricated by solution coating powder metallurgy process. The hardness, wear resistance and coefficient of thermal expansion (CTE) of the reinforced aluminum composites and the associated microstructural changes with rGO range (0.2–0.6 wt%) and hybrids of 0.2 wt% CNT–rGO at different ratios have been investigated. The intensive microstructural observations show that rGO is adso...
9 CitationsSource
#1Peter Nyanor (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 2
#2Omayma A. ElkadyH-Index: 13
Last. Mohamed Hassan (E-JUST: Egypt-Japan University of Science and Technology)H-Index: 27
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Aluminium (Al) matrix reinforced with carbon nanotubes (CNT), micron-sized titanium carbide (TiC) particles, and bimodal (nano + micron) hybrid TiC–CNT is fabricated by solution ball milling, followed by cold compaction and vacuum sintering to improve the mechanical properties and reduce thermal expansion. The hardness, wear resistance, compressive strength and CTE of pure Al, 0.6 wt% CNT/Al, 10 wt% TiC/Al, and hybrid 10–0.6 wt% TiC–CNT/Al composites have been investigated in this work. Analysis...
3 CitationsSource
#1Mikko Hietala (University of Oulu)H-Index: 4
#2Atef Hamada (University of Oulu)H-Index: 19
Last. Antti Järvenpää (University of Oulu)H-Index: 11
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1 CitationsSource
#1Markku Keskitalo (University of Oulu)H-Index: 5
#2Atef Hamada (University of Oulu)H-Index: 19
Last. Antti Järvenpää (University of Oulu)H-Index: 11
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#1Timo Rautio (University of Oulu)H-Index: 6
#2Jarmo Mäkikangas (University of Oulu)H-Index: 4
Last. Atef Hamada (University of Oulu)H-Index: 19
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