Papers by Eman AbdElRhiem
Scientific Reports
The present study explores the preparation of Al–10wt.%Zn alloy by the casting process. Nano CuO ... more The present study explores the preparation of Al–10wt.%Zn alloy by the casting process. Nano CuO was prepared by the Co-precipitation method. The effect of adding nanostructure of (1wt.% CuO) to Al–10Zn alloy was studied the corrosion effects as-cast and with different aging temperatures (423, 443, and 463 K) for 2 h in 3.5% NaCl aqueous solution after homogenized for 2 h at 500 K at room temperature. Electrochemical measurements (OCP, Tafel, and EIS) were performed to determine the corrosion rate (C.R.) and corrosion current density (Icorr.) to find out corrosion behavior. In addition, microstructures of Al–10Zn and Al–10Zn–1CuO were observed using a scanning electron microscope, EDX mapping, and the optical microscope to investigate the effect of the nanoparticle’s addition before and after aging and the corrosion test. The average crystal size and the dislocation density were calculated from the XRD pattern. The results show that the appropriate addition of CuO nanoparticles can ...
Effects of TiO2, CuO, and SiO2 nanoparticles addition on the microstructure and mechanical properties of Al-10 wt% Zn alloy
Physica Scripta
This paper presents the effects of adding TiO2, CuO, and SiO2 (1 wt%) nanoparticles on the micros... more This paper presents the effects of adding TiO2, CuO, and SiO2 (1 wt%) nanoparticles on the microstructure and mechanical properties of Al-10 wt% Zn alloy. A set of composite alloys was produced by incorporating SiO2, CuO, and TiO2 nanoparticles to the Al-10 wt% Zn alloy. Optical microscope (OM), scanning electron microscope (SEM) fitted with an Energy Dispersive Spectroscope (EDS), and X-ray diffraction (XRD) were used to investigate the microstructure of these alloys. The mechanical properties of the composite solders were assessed using the Vickers hardness tests. After a solution heat treatment at 500 K for 2 h, samples were immediately aged at 373 to 473 K for 2 h, followed by water quenching at 300 K. The experimental data indicated that Al-10 wt% Zn-1wt% SiO2 samples had the highest hardness values among all investigated composite alloys. The calculated porosity percentages of the composite alloys revealed that the Al-10 wt% Zn-1 wt% SiO2 samples had the lowest percentage. Thi...
Effects of TiO<sub>2</sub>, CuO, and SiO<sub>2</sub> nanoparticles addition on the microstructure and mechanical properties of Al-10 wt% Zn alloy
Physica Scripta, May 25, 2023
This paper presents the effects of adding TiO2, CuO, and SiO2 (1 wt%) nanoparticles on the micros... more This paper presents the effects of adding TiO2, CuO, and SiO2 (1 wt%) nanoparticles on the microstructure and mechanical properties of Al-10 wt% Zn alloy. A set of composite alloys was produced by incorporating SiO2, CuO, and TiO2 nanoparticles to the Al-10 wt% Zn alloy. Optical microscope (OM), scanning electron microscope (SEM) fitted with an Energy Dispersive Spectroscope (EDS), and X-ray diffraction (XRD) were used to investigate the microstructure of these alloys. The mechanical properties of the composite solders were assessed using the Vickers hardness tests. After a solution heat treatment at 500 K for 2 h, samples were immediately aged at 373 to 473 K for 2 h, followed by water quenching at 300 K. The experimental data indicated that Al-10 wt% Zn-1wt% SiO2 samples had the highest hardness values among all investigated composite alloys. The calculated porosity percentages of the composite alloys revealed that the Al-10 wt% Zn-1 wt% SiO2 samples had the lowest percentage. This finding can be attributed to the fact that these samples demonstrated the highest hardness values. The hardness of all composite alloys decreased with increasing the aging temperature with anomalous behavior at 443 K, where they had abnormally high values. The observed differences in the mean crystallite size, lattice strain, and dislocation density of the composite alloys, calculated from XRD data with increasing aging temperature, are attributed to the precipitation in Al-Zn alloys. The calculated values of the stress exponent and activation energy of composite alloys may be associated with grain boundary diffusion (GBD) as the dominant operating mechanism.
Physica scripta, 2023
This paper presents the effects of adding TiO 2 , CuO, and SiO 2 (1 wt%) nanoparticles on the mic... more This paper presents the effects of adding TiO 2 , CuO, and SiO 2 (1 wt%) nanoparticles on the microstructure and mechanical properties of Al-10 wt% Zn alloy. A set of composite alloys was produced by incorporating SiO 2 , CuO, and TiO 2 nanoparticles to the Al-10 wt% Zn alloy. Optical microscope (OM), scanning electron microscope (SEM) fitted with an Energy Dispersive Spectroscope (EDS), and X-ray diffraction (XRD) were used to investigate the microstructure of these alloys. The mechanical properties of the composite solders were assessed using the Vickers hardness tests. After a solution heat treatment at 500 K for 2 h, samples were immediately aged at 373 to 473 K for 2 h, followed by water quenching at 300 K. The experimental data indicated that Al-10 wt% Zn-1wt% SiO 2 samples had the highest hardness values among all investigated composite alloys. The calculated porosity percentages of the composite alloys revealed that the Al-10 wt% Zn-1 wt% SiO 2 samples had the lowest percentage. This finding can be attributed to the fact that these samples demonstrated the highest hardness values. The hardness of all composite alloys decreased with increasing the aging temperature with anomalous behavior at 443 K, where they had abnormally high values. The observed differences in the mean crystallite size, lattice strain, and dislocation density of the composite alloys, calculated from XRD data with increasing aging temperature, are attributed to the precipitation in Al-Zn alloys. The calculated values of the stress exponent and activation energy of composite alloys may be associated with grain boundary diffusion (GBD) as the dominant operating mechanism.
Scientific reports, 2023
The present study explores the preparation of Al-10wt.%Zn alloy by the casting process. Nano CuO ... more The present study explores the preparation of Al-10wt.%Zn alloy by the casting process. Nano CuO was prepared by the Co-precipitation method. The effect of adding nanostructure of (1wt.% CuO) to Al-10Zn alloy was studied the corrosion effects as-cast and with different aging temperatures (423, 443, and 463 K) for 2 h in 3.5% NaCl aqueous solution after homogenized for 2 h at 500 K at room temperature. Electrochemical measurements (OCP, Tafel, and EIS) were performed to determine the corrosion rate (C.R.) and corrosion current density (I corr.) to find out corrosion behavior. In addition, microstructures of Al-10Zn and Al-10Zn-1CuO were observed using a scanning electron microscope, EDX mapping, and the optical microscope to investigate the effect of the nanoparticle's addition before and after aging and the corrosion test. The average crystal size and the dislocation density were calculated from the XRD pattern. The results show that the appropriate addition of CuO nanoparticles can refine the Al-10Zn alloy and shift the Al-10Zn alloy to a more noble direction.
The present study explores the preparation of Al-10wt.%Zn alloy by the casting process. Nano CuO ... more The present study explores the preparation of Al-10wt.%Zn alloy by the casting process. Nano CuO was prepared by the Co-precipitation method. The effect of adding nanostructure of (1wt.% CuO) to Al-10Zn alloy was studied the corrosion effects as-cast and with different aging temperatures (423, 443, and 463 K) for 2 h in 3.5% NaCl aqueous solution after homogenized for 2 h at 500 K at room temperature. Electrochemical measurements (OCP, Tafel, and EIS) were performed to determine the corrosion rate (C.R.) and corrosion current density (I corr.) to find out corrosion behavior. In addition, microstructures of Al-10Zn and Al-10Zn-1CuO were observed using a scanning electron microscope, EDX mapping, and the optical microscope to investigate the effect of the nanoparticle's addition before and after aging and the corrosion test. The average crystal size and the dislocation density were calculated from the XRD pattern. The results show that the appropriate addition of CuO nanoparticles can refine the Al-10Zn alloy and shift the Al-10Zn alloy to a more noble direction. Aluminum (Al) and its alloys have recently been employed extensively in modern engineering applications due to its high strength and lightweight 1,2. Moreover, their hardness, low wear, and chemical resistance limit their use in various automotive, construction, and aerospace applications 3-6. Pure Al has weak mechanical characteristics in engineering applications, whereas alloying and heat treatment can improve it. e proper Al alloys must be chosen for required applications considering their speci c rigidity, thermic conductivity, low density, strength, formability, weldability, workability, ductility, wear, and corrosion resistance 7. ere are more and more applications for cast alloys made from Al and Zinc (Zn)-based matrices, and their production is rising globally 8. e primary purpose for concentrating on Al-Zn alloys is that adding Zn causes value addition, improves the matrix's homogeneity, and enhances Al alloys properties 9. Zn has a high solubility in the Al matrix; adding Zn causes a low lattice distortion, which almost has no impact on the alloy's formability 10. Al-Zn alloys have high strength, ductility, heat treatability, excellent hot workability/formability, and good welding properties 11,12. Al-Zn alloys also have a considerable impact on their microstructure, being a ne-grained industrial alloy used to create high-strength corrosion-proof (veri cation) structures for aircra , ships, and vehicle buildings 13. Hence, it is necessary to constantly support the Al matrix with suitable Ceramic nano particulate reinforced ceramics such as CuO, TiO 2 , SiC, SiO 2 , B 4 C, and Al 2 O 3 14,15. ey are considered the best option for Al as a matrix base metal because they impart high strength and resistance to wear and corrosion 16. Ceramic particles play a role in increasing mechanical strength by acting as a nucleation site for solidi cation, allowing the grain size to be ner. Alloying elements' function is to form a solid solution of Al alloy, which causes grain size re nement. At the same time, the role of alloying elements is to develop a solid solution of Al alloy which causes grain size re nement. ere are di erent ways to make Al alloys' nanocomposites, such as stir casting, which mainly works in manufacturing the composites as it produces composites with uniform reinforcement distribution 6,17-19. CuO is one of the best choices for Al matrix nanocomposite because it has many advantages; CuO addition in Al matrix material improves corrosion resistance, stability, sti ness structural applications, particularly for aerospace and automobile engineering, and thermal properties 20. CuO was chosen in this study for various reasons, including; commercially, CuO particles were used to create Al-based composites due to their superior mechanical and physical properties 21. Low-cost, widely available. CuO has received much research attention due to its many valuable uses in electrical equipment, including Solar cells, highly hydrophobic surfaces, and gas detection sensors 22. Cu addition lowers the melting point and may cause the creation of the Al 2 Cu phase, which
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Papers by Eman AbdElRhiem