ABDELKADER Hanna
عبد القادر حنة
abdelkader.hanna@univ-msila.dz
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- Departement of Physics
- Faculty of Sciences
- Grade PHd
About Me
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 1991-10-15 00:00:00
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ABDELKADER Hanna birthday
- 2019
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2019
Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion
Samples of an Mg-0.41Dy (wt. %) alloy were severely deformed by high-pressure torsion (HPT) at room temperature up to 15 turns and the texture, microstructure and microhardness values in the centres, mid-radial points and edges of the HPT-deformed discs were investigated using X-ray diffraction, Electron BackScatter Diffraction and Vickers microhardness measurements. The textures in the centres of discs were characterized by a typical weak basal fiber whereas at both the mid-points and edges of the discs there was a strong basal texture where the c-axis of most grains was shifted 15° away from the shear direction. An almost homogeneous ultrafine-grained structure with a grain size of about 0.75 μm was achieved after 15 HPT turns. The microhardness values in these three positions increased with increasing numbers of turns, reached a maximum and then decreased to a lower steady-state level at large strains. In addition to dislocation and grain size hardening, the results show that texture strengthening contributes significantly to the rapid increase in hardening in the early stages of deformation.
Citation
abdelkader hanna , Hiba AZZEDDINE , Rabeb Lachhab, Thierry Baudin, Anne Laure Helbert, François Brisset, Yi Huang, Djamel Bradai, Terence G. Langdon., , (2019), Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion, Journal of Alloys and Compounds, Vol:778, Issue:, pages:61–71, elsevier
- 2019
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2019
Thermal Stability of an Mg–Nd Alloy Processed by High-Pressure Torsion
The evolution of microstructure, texture, and mechanical properties of an Mg–1.43Nd (wt%) alloy is investigated after processing by high‐pressure torsion at room temperature through five turns and isochronal annealing for 1 h at 150, 250, 350, and 450 °C using electron backscatter diffraction and Vickers microhardness. The alloy exhibits a good thermal stability up to annealing at 250 °C, with mean grain size of ≈0.65 μm. The microhardness shows an initial hardening after annealing at 150 °C and then a subsequent softening. The deformation texture, a basal texture shifted 60° away from the shear direction (SD), is retained during annealing up to 250 °C. In contrast, a basal texture with symmetrical splitting toward SD is developed after annealing at 350 °C. The precipitation sequence and their pinning effects are responsible for the age‐hardening, stabilization of grain size, and the texture modification. The kinetics of grain growth in the Mg–1.43Nd alloy follows two stages depending on the temperature annealing range, with an activation energy of ≈26 kJ mol−1 in the low temperature range of 150–250 °C and ≈147 kJ mol−1 in the high temperature range of 250–450 °C.
Citation
Tighiouaret Samia , abdelkader hanna , Hiba AZZEDDINE , Rabeb Lachhab, Y. Huang, T. Baudin, A-L. Helbert, F. Brisset, D. Bradai, T.G. Langdon, , (2019), Thermal Stability of an Mg–Nd Alloy Processed by High-Pressure Torsion, Advanced Engineering Materials, Vol:21, Issue:12, pages:1900801, Wiley Online Library
- 2019
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2019
An investigation of the thermal stability of an Mg-Dy alloy after processing by high-pressure torsion
An Mg-0.41Dy (wt%) alloy was successfully processed by high-pressure tension (HPT) through 5 turns at room temperature. The evolution of the recrystallization microstructure and the texture and mechanical properties of the deformed alloy were investigated after annealing at 200 and 400 °C for 1 h using Electron Backscatter Diffraction (EBSD) and Vickers measurements. The recrystallization temperature and activation energy were evaluated using Differential Scanning Calorimetry (DSC). Processing by HPT led to significant grain refinement with an average grain size of ~0.5 ± 0.1 μm which increased to ~1.2 ± 0.8 μm after annealing at 400 °C. This slow increase in grain size at a high temperature demonstrates a good thermal stability of the microstructure. The alloy exhibited two main fiber textures after HPT processing: firstly a typical basal fiber (φ1 = 0–360°, Φ = 0° and φ2 = 0–60°) and secondly a fiber localized at φ1 = 180°, Φ = 60° and φ2 = 0–90°. These textures were retained after annealing at 400 °C. There was no change in the microhardness value after annealing at 200 °C (41 ± 1 Hv) and only a minor decrease after annealing at 400 °C (38.4 ± 0.5 Hv). The DSC results showed that the temperature associated with the recrystallization process increased with increasing heating rate and the activation energy for recrystallization was measured as ~25 kJ mol−1.
Citation
abdelkader hanna , Hiba AZZEDDINE , Y. Huang, D. Bradai, J. M. Cabrera, T. G. Langdon, , (2019), An investigation of the thermal stability of an Mg-Dy alloy after processing by high-pressure torsion, Materials Characterization, Vol:151, Issue:, pages:519–529, elsevier
- 2019
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2019
Microstructure and texture evolution of AZ31 Mg alloy after uniaxial compression and annealing
The effect of initial texture on the microstructure and texture evolution of as extruded AZ31 alloy after hot uniaxial compression at 430 °C and subsequent annealing at 450 °C for 72h has been investigated using electron backscatter diffraction. Samples were machined from the extruded block in such orientations that the compression axis, CD, was parallel (CD0ED) or perpendicular (CD90ED) to the initial extrusion direction, ED, respectively. Results show that the deformation microstructure for both samples was characterized by equiaxed grains that resulted from dynamic recrystallization. Annealing at 450 °C for 72 h led to the increase of grains size to 28 and 25 µm for CD0ED and CD90ED samples, respectively. A random deformation texture was developed in CD0ED sample while the deformation of CD90ED developed typical (0002) basal texture. The deformation textures of both samples were retained after subsequent annealing at 450 °C for 72 h. The flow behavior was affected by the initial texture. The CD0ED sample showed the highest work hardening. These evolutions were explained in term of the activation and suppression of basal, non-basal slip and mechanical twinning.
Citation
abdelkader hanna , Hiba AZZEDDINE , Fadi Abouhilou, Djamel Bradai, , (2019), Microstructure and texture evolution of AZ31 Mg alloy after uniaxial compression and annealing, Journal of Magnesium and Alloys, Vol:7, Issue:1, pages:124–133, National Engineering Research Center for Magnesium Alloys of China, Chongqing University
- 2019
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2019
Effect of hot rolling on the corrosion behavior of AZ31 magnesium alloy
The aim of the present study is to investigate the effect of deformation conditions on the corrosion behavior of AZ31 (Mg-3Al-1Zn, % wt.) in 0.9% NaCl (wt.%) solution. The AZ31 alloy was hot rolled at 360 °C to 20 and 50% of thickness reduction. Electrochemical measurements were used to study the corrosion behavior of AZ31 alloy. Analysis of corrosion products after immersion test was performed using optical microscopy, X-ray diffraction and Raman spectroscopy. The mechanical properties of corroded samples were investigated using tensile test at room temperature. Results indicated that the corrosion rate was strongly affected by the hot rolling level. A lower corrosion potential and reduced polarization resistance was observed after hot rolling compared to the as received AZ31 alloy. The corrosion product was evidenced mainly as Mg(OH)2 compound exhibiting a filiform-like morphology. Apparently, the corrosion improved the room temperature ductility of AZ31 alloy.
Citation
abdelkader hanna , Achour Dakhouche , Hiba AZZEDDINE , K. Tirsatine, A. Sari, Y. Khereddine, D. Bradai, , (2019), Effect of hot rolling on the corrosion behavior of AZ31 magnesium alloy, Metallurgical Research & Technology, Vol:116, Issue:, pages:109, EDP Sciences