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RISS 인기검색어
- 검색키워드
- 저자 : Hossam M. Yehia (검색결과 4 건)
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Hot Pressing of Al-10 wt% Cu-10 wt% Ni/x (Al2O3–Ag) Nanocomposites at Different Heating Temperatures
Hossam M. Yehia,S. Allam 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
For achieving good adhesion, full densification, and consequently, improving weakness in mechanical properties of aluminummatrix, the electroless coating, and cold–hot pressing have applied. Five Al-10 wt% Cu-10 wt% Ni/x (Al2O3–Ag)nanocomposites prepared by mixing for 6 h then fabricated by the cold pressing followed by hot pressing at different heatingtemperatures. Some properties of the fabricated samples include density, chemical composition, microstructure, hardness,toughness, wear rate, and wear behavior have characterized. No effect of alumina reinforcement on the densification hasobserved. New intermetallic such as Al3Ni2,Al3Ni,CuAl2,and Al3.892Cu6.1have formed at 630 °C. No cracks have propagatedas a result of penetrating the indenter during hardness tests that means good toughness for all nanocomposites. Thewear rate has decreased by increasing Al2O3content. It has observed that plastic deformation dissipated by increasing theAl2O3addition. The coefficient of thermal expansion gets enhanced by increasing the Al2O3range.
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Hossam M. Yehia,Nasreen Abdelalim,I. El-Mahallawi,Tamer Abd-elmotaleb,W. Hoziefa 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
In this study, alumina and graphite in a 98 % to 2 % ratio were prepared by mechanical milling for 80 hrs, then surface coated with 2 %Ag. The motorcycle wheel aluminum swarf was melted at 800 °C then the new hybrid (Al 2 O 3 -GNs)Ag in proportions of 1, 2, and 3 wt% was added at 600 rpm for 10 min. The microstructure of the rolled samples showed a good distribution of the hybrid (Al 2 O 3 -GNs)Ag and good adhesion with the aluminum matrix. The hardness increased by adding alumina and the hybrid up to 3 %. The as-rolled 3 %(Al 2 O 3 -GNs)Ag samples gave the best mechanical properties (yield strength, tensile strength, and elongation) compared to the as-cast aluminum reinforced with alumina and hybrid. The corrosion rate was improved by reinforcing the aluminum with the hybrid (Al 2 O 3 -GNs)Ag. Due to reducing the particles size and increasing the surface area after the rolling process, a deterioration in the corrosion resistance was observed.
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Peter Nyanor,Omayma El‑Kady,Hossam M. Yehia,Atef S. Hamada,Koichi Nakamura,Mohsen A. Hassan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
Aluminum matrix composites reinforced with reduced graphene oxide (rGO) and hybrid of carbon nanotube (CNT) andrGO are fabricated by solution coating powder metallurgy process. The hardness, wear resistance and coefficient of thermalexpansion (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 microstructuralobservations show that rGO is adsorbed on Al particles and uniformly distributed in the Al matrix composites. The hardnessvalues of the composites increase significantly with rGO reinforcement exhibiting the maximum hardness at 0.4 wt% rGO.Compared with the hybrid composites CNT–rGO/Al counterparts fabricated by the same route and wt. percent of 0.2, thehardness values in the hybrid CNT–rGO increase considerably. Similar to the hardness, the results of wear tests also exhibitcorresponding variation in the values of the wear rates. The improvement in the wear resistance of the hybrid CNT–rGO /Alcomposite is pronounced in this work. Whereas the rGO reinforcements decrease significantly the wear rate of the aluminumbaseby 98%, the wear resistance of the corresponding hybrid CNT–rGO is significantly higher than that of the precedingcomposites. Maximum CTE reduction of 28% was recorded for hybrid CNT–rGO (1:1) reinforced composite.
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Peter Nyanor,Omayma El‑Kady,Hossam M. Yehia,Atef S. Hamada,Mohsen A. Hassan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.4
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 sinteringto improve the mechanical properties and reduce thermal expansion. The hardness, wear resistance, compressive strength andCTE 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 inthis work. Analysis of strengthening mechanisms based on theoretical models, microstructure, and properties of constituentmaterials is performed. Microstructure analysis reveals an excellent distribution of the reinforcement phase and no new phaseformation in sintered composites. The hardness value of bimodal TiC–CNT reinforced Al composite is significantly higherthan monomodal TiC reinforced composite, reaching 2.3 times the hardness value of pure Al. Similarly, the wear resistanceimproved, and CTE reduced with CNT and TiC addition but is even significantly better in the hybrid reinforced composite. Experimental values of CTE show good agreement with the theoretical model. The strength and ductility of materials aremutually exclusive, but the compressive strength of pure Al has been doubled without significant loss in ductility throughthe use of bimodal-sized hybrid TiC–CNT reinforcement in this work.
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