SALAHEDDINE Sadi
سعدي صلاح الدين
salaheddine.sadi@univ-msila.dz
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- Departement of Physics
- Faculty of Sciences
- Grade PHd
About Me
Research Domains
physique des matériaux
LocationMsila, Msila
Msila, ALGERIA
Code RFIDE- 1994-12-13 00:00:00
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SALAHEDDINE Sadi birthday
- 2023-01-01
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2023-01-01
Grain growth activation energy of ECAP-processed Mg-Ce alloy: Effect of deformation temperature
In the present work, the grain growth activation energy, Q was evaluated in a Mg-0.3Ce (wt%) alloy after equal-channel angular pressing (ECAP) processing via route Bc for 4 passes at 300 and 350 °C and followed by isochronal annealing at 150, 250, 350, and 450 °C for 2 h. The results demonstrated that Q depends strongly on the deformation processing. The Q value was equal to 111.4 ± 5.7 kJ/mol for the sample ECAP-processed at 300 °C. While the sample ECAP-processed at 350 °C shows the presence of two different Q values depending on the annealing temperature, QI = 26.5 ± 3.4 kJ/mol in the low-temperature range (150–350 °C) and QII = 120.7 kJ/mol in the high-temperature range (350–450 °C). This behaviour was attributed to the resulting deformation microstructure and the occurrence of dynamic grain growth during ECAP processing at 350 °C.
Citation
Hiba AZZEDDINE , SALAHEDDINE SADI , A. Hanna, T. Baudin, F. Brisset, J. M. Cabrera, , (2023-01-01), Grain growth activation energy of ECAP-processed Mg-Ce alloy: Effect of deformation temperature, Materials Today Communications, Vol:37, Issue:, pages:107161, Elsevier
- 2022-12-12
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2022-12-12
Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy
The static recrystallization/grain growth kinetics of the AZ31 (Mg-3Al-1Zn, wt%) alloy were investigated employing Vickers microhardness and electron backscatter diffraction (EBSD) measurements. The AZ31 alloy was subject to a hot-rolling for 70% of thickness reduction and then annealed at various temperatures (150 C, 250 C, and 350 C) from 5 min to 24 h. First, the static recrystallization kinetics were analysed by means of the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. The results showed that the recrystallization occurred under two regimes both involving their own Avrami exponent/activation energy. In regime I, the Avrami exponent was found in the range of 1.5-0.35 depending on the annealing temperature and activation energy of 74.1±5.7 kJ× mol-1. In regime II, an identical value of Avrami exponent was found (0.1-0.2) and a very low activation energy of 14.8±0.7 kJ× mol-1 was found for all annealing conditions. Non-random nucleation sites such as shear bands were considered as the main factor responsible for the deviation from the JMAK model. Moreover, the grain growth kinetics was well fitted by the general equation where. Accordingly, Q g= 109±0.2 kJ× mol-1 which is median between grain boundary diffusion and bulk diffusion values for Mg and its alloys. The derived activation energies were discussed in terms of influencing factors such as solute drag, formation of basal texture, and microstructural heterogeneities like shear bands and twinning.
Citation
SALAHEDDINE SADI , Hiba AZZEDDINE , Abdelkader Hanna, Thierr Baudin, Anne-Laure Helbert, François Brisset, Djamel Bradai, , (2022-12-12), Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy, Journal of Metals, Materials and Minerals, Vol:32, Issue:1, pages:12-26, scopus
- 2022
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2022
Microstructure and texture evolution of ECAP-processed Mg-Ce alloy during isothermal annealing
Static recrystallization and grain growth behaviors were investigated in Mg-0.3Ce (wt%) alloy processed by equal-channel angular pressing (ECAP) for N = 1 (εeq = 0.9), 2 (εeq = 1.9), and 4 (εeq = 3.9) passes at 300 °C using route Bc and annealed at 450 °C for 5, 30, 60, and 180 min. The results demonstrated that the annealed microstructure and texture are strongly related to the strain level, second particles distribution, and fraction of dynamic recrystallization (DRX) during ECAP. At low strain (1 ECAP pass), the microstructure was very heterogeneous and the texture development changed with increasing annealing time due to the absence of sufficient recrystallization nucleation sites and pinning effect of second particles. At medium strain (2 ECAP passes), the microstructure was homogeneous, however, the texture was unstable mainly due to the limited DRX during ECAP processing leading to the preferred grain growth. At high strain (4 ECAP passes), the microstructure was homogeneous and the texture was retained throughout the entire annealing duration due to the significant amount of DRX.
Citation
SALAHEDDINE SADI , Hiba AZZEDDINE , Abdelkader Hanna, Thierry Baudin, Francois Brisset, Jose Maria Cabrera, , (2022), Microstructure and texture evolution of ECAP-processed Mg-Ce alloy during isothermal annealing, Materials Today Communications, Vol:32, Issue:, pages:103920, Elsevier
- 2022
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2022
INVESTIGATION OF THE STATIC RECRYSTALLIZATION OF AZ31 MAGNESIUM ALLOY
Static recrystallization of AZ31 alloy (Mg-3Al-1Zn, wt.%) is evaluated using Vickers microhardness and optical microscopy. The alloy was hot-rolled at 350°C for 70% of thickness reduction and then annealed at 450°C for periods ranging from 5 min to 24 h. The average grain size increases with increasing annealing time and reaches a value of 19 μm after 24 h. While the microhardness decreases from 64 Hv in the deformed condition to 56 Hv after annealing for 24 h.
Citation
SALAHEDDINE SADI , Hiba AZZEDDINE , Abdelkader Hanna, ,(2022), INVESTIGATION OF THE STATIC RECRYSTALLIZATION OF AZ31 MAGNESIUM ALLOY,Proceedings of 1st National Conference of Materials sciences And Engineering, (MSE’22),Khenchela
- 2021
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2021
Characterization of microstructure and texture of binary Mg-Ce alloy processed by equal channel angular pressing
The characterization of microstructure and texture development of binary Mg-0.3Ce (wt%) after equal-channel angular pressing (ECAP) processing via route Bc at 300 and 350 °C through 4 passes were investigated using electron backscatter diffraction (EBSD) measurements. The results demonstrated an effective grain refinement from millimeter range to 6.7 and 8.3 μm obtained after 4 passes at 300 and 350 °C, respectively. The grain refinement was obtained through dynamic recrystallization (DRX). At 300 °C, DRX occurred at low strain by twin-induced dynamic recrystallization (TDRX) and particle stimulated nucleation (PSN) mechanism and then converted with increasing strain to sub-grain development (SD) and grain boundary bulging dynamic recrystallization (GBBDRX). Besides, grain growth occurred during processing at 350 °C. The texture development strongly depends on the strain level, deformation temperature and DRX mechanisms. At 300 °C, a typical basal texture with a deviation of 40° towards extrusion direction was formed gradually up to 4 passes while a completely different texture was formed at 350 °C due to the large grain size.
Citation
SALAHEDDINE SADI , Hiba AZZEDDINE , Abdelkader Hanna,, Casimir Casas, Thierry Baudin,, Anne-Laure Helbert,, François Brisset, Jose Maria Cabrera, , (2021), Characterization of microstructure and texture of binary Mg-Ce alloy processed by equal channel angular pressing, Materials Characterization, Vol:181, Issue:, pages:111454, Elsevier