
Ahmed S.J. Al-ZubaydiUniversity of Southampton · Faculty of Engineering and the Environment
Ahmed S.J. Al-Zubaydi
Doctor of Engineering
Additive Manufacturing, Severe Plastic Deformation
About
14
Publications
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225
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Introduction
Additional affiliations
January 2006 - September 2011
University of Technology
Position
- Lecturer
January 2006 - present
University of Technology
Position
- Lecturer
Publications
Publications (14)
The paper studies the use and properties of Mg-Al0.09-Z n0.01 magnesium alloy in photo-conversion application. Magnesium alloys have excellent specific strength, stiffness, damping vibrations, and recyclability, making them highly desirable in industries such as automotive, aerospace, and electrical consumer devices. Also, the use of nanoparticles...
In this research, the nanoparticles (NPs) of magnesium alloy (Mg–Al-Zn) were prepared using a laser ablation technique in a solution and then deposited on porous silicon. The structural characterization, electrical, and spectral properties of the nanoparticles deposited on the porous silicon were investigated. Firstly, the initial alloy was made as...
Mg–8Al–1Zn magnesium alloy was successfully processed using deferential speed rolling (DSR) at temperatures of 400 and 450 °C for thickness reduction of 30, 50, and 70% with no significant grain growth and dynamic recrystallization. Using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), the ro...
Ultrafine-grained Al–9%Si–3%Cu alloy was achieved by a combination of laser powder bed fusion (LPBF) additive manufacturing and high-pressure torsion (HPT) processing in this investigation. The alloy was initially deposited layer-by-layer using a bi-directional scan strategy in LPBF with a scan rate of 1000 mms ⁻¹ , a layer thickness of 40 µm and a...
The tensile properties of an ultrafine-grained Al–9%Si–3%Cu alloy deposited by the laser powder bed fusion process have been investigated in this work. The additively manufactured (AM) alloy was subjected to high-pressure torsion processing at room temperature successfully at different number of turns in HPT and then inspected through hot tensile t...
Nanostructured Al-9%Si-3%Cu alloy was achieved by direct metal laser sintering (DMLS) and then processed using high-pressure torsion (HPT) processing, which resulted in considerable grain refinement down to 60 nm associated with a substantial dislocation density up 6.2 × 10 ¹⁴ m ⁻² and a significant reduction in the porosity. Hardness measurements...
A composite material was prepared using epoxy as a matrix, and carbon fiber (20% volume fraction) together with nano titanium dioxide (TiO 2 ) particles in varying weight fractions (0,2,4 and 6%) as hybrid reinforcement. Mechanical tests (impact strength and wear resistance) were carried out, in addition to the study of liquid uptake behavior durin...
This research reports the study of epoxy reinforced with human hair as a potential building material for the purpose of acoustic and thermal insulation for building industry. The sound insulation and thermal conductivity were studied for an epoxy composite reinforced with 15% human hair, together with a set of mechanical properties (tensile strengt...
An investigation has been conducted on AZ91 magnesium alloy processed in high-pressure torsion (HPT) at 296, 423 and 473 K for different numbers of turns. The microstructure has altered significantly after processing at all processing temperatures. Extensive grain refinement has been observed in the alloy processed at 296 K with apparent grain size...
AZ91 magnesium alloy has been successfully processed at room temperature by high–pressure torsion as well as at elevated temperatures. Ultrafine grains and nano–sized particles of β–phase have developed with increasing number of turns. The hydrostatic pressure, the geometry of the processing zone and the unidirectional nature of torsional straining...
Two sets of anvils having different surface roughness were used to systematically investigate the flow patterns developed on the top and bottom surfaces of stainless steel discs with an anvil misalignment of 100 µm during high-pressure torsion. It is shown that the flow patterns on the disc surfaces have different variation tendencies depending on...
Stainless steel was selected to study the flow patterns developed with anvil misalignments of 100, 200 and 300 μm on the disc lower surfaces during processing by high-pressure torsion (HPT) through totals of up to 16 turns. A pair of anvils having a roughness of Ra ≈ 15 μm was utilized to investigate the flow pattern development. Discs subjected to...
Experiments were conducted to evaluate the evolution of structure and hardness in processing by high-pressure torsion (HPT) of the magnesium AZ91 and AZ31 alloys. Both alloys were processed by HPT at room temperature for 1/4, 1, and 5 turns using a rotation speed of 1 rpm. Structure observations and microhardness measurements were undertaken on ver...