The nanocompsite of alumina (Al2O3) produced a number of beneficial effects in alloys. There is increasing in resistance of materials to surface related failures , such as the mechanical properties , fatigue and stress corrosion cracking .The experimental results observed that the adding of reinforced nanomaterials type Al2O3 enhanced the HB hardness, UTS, 0.2 YS and ductility of 2014 Al/Al2O3 nano composites . the analysis of experiments, indicated that The maximum enhancement was observed at 0.4 wt.% Al2O3. The ultimate improvement percentage were 15.78% HB hardness, 18.1% (UTS), 12.86% (0.2 YS) and 25.71% ductility. These enhancements in the above properties maybe to high dislocation density resulting in good bounding between Al2O3 and metal matrix.
The applications of nanotechnology differ in different areas of life. Despite all the advantages of nanomaterials, there are many difficulties that need further research the most important of which is obtaining cheap, practical materials with appropriate specifications for use in various applications. This study examines the addition of multiple proportions of two materials (Silicon Carbide and Zirconia) to 6261 Aluminum alloy. Results were obtained stating that using the two nano-materials together is better than using each one separately. The best ultimate tensile strength (UTS)waders were obtained at (1.5-2.0 wt%) ratios ranging. 1.5% wt. of ZrO2 and (%SiC+% ZrO2). The improvements were (75.1 %) and (92 %) respectively. The UTS improvements (84.3%) for Al/ 2.0wt. %SiC. Also, a significant improvement was seen in the hardness values for all the weight ratios of the nano-additives with respect to the base alloy. The percentage of ductility has decreased after adding nano-materials.
The fatigue is one of the major reasons for fracture of materials. Aluminum 7204 AA alloy with various heat treatments and (2.0) wt % of SiC nanoparticles were prepared by stir-casting method under rotating bending loading with ratio of stress (R= -1). The composite was strengthened by SiC particles size of) 10 (nanometre. The fatigue strength and life were obtained experimentally by the family of S-N curves for different heat treatments. The endurance limits (107cycles) for 7204 AA/ 2.0wt% SiC nano-composite fatigue strength as related to untreated nanocomposite was enhanced by 72 and 78.5% for T4 and T6, respectively.The improvement of fatigue properties is due to better spreading of SiC nanoparticles and increased porosity.
Aluminum alloy metal matrix composites ( ) with different wt % of Al 2 O 3 . (0.2, 0.4, 0.6, 0.8, and 1), the size of reinforced particles is 10 Nano meter , were fabricated using stir casting technique. The influence of adding Al 2 O 3 particles content on the mechanical properties of the . It was observed that the nanomaterial reinforcement led to high improvement in BHN hardness ultimate strength ( ), yield stress ( ) and ductility. The improvements were due to regular distribution of Al 2 O 3 and refinement of aluminum 7075 grains. The maximum improvement in BHN hardness, and was observed at 0.2 wt %. Al 2 O 3 . While the minimum value of ϵ % was obtained at 0.2 wt % Al 2 O 3.
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