الفهرس 
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Abstract
Nano-composites manufacturing is one of advance manufacturing technique in the history of materials. Friction stir processing (FSP) is an emerging engineering technology that can produces nano-composites and homogenous microstructures, thereby improving the mechanical properties. The present work present fabrication and then welding of 5083 Al-22 vol. % nano SiO2 using FSP and FSW and also study the parameters effecting mechanical properties and microstructures of fabricated composite and welded composite, to get optimum parameters of FSP and FSW composite. Firstly, nano-composites were manufactured in the changing conditions of the processing process as follows:1- When the speed of rotation is set at rotation speed 400 rpm, and tool travel speed 100 mm/min with the number of Passes from one Pass to four Passes to choose the best number of Passes for the manufacture of the nano-materials. Overall, the best friction processing is performed in one Pass, In general it is found that, FSP optimum condition it single pass, at this condition highest Electrical resistance, increases the ultimate tensile strength (UTS) up to about 110.6 %, elongation percentage up to about 132.1 % , micro-hardness number up to about 131.7% and impact energy up to about 125.4 from the base material. Also, coarse second phase particle fragmentation and grain refining are observed. Both macrostructure and microstructure observations indicate homogenous microstructures of the selected composite Fabricated by FSP.2-In proving the number of Passes when a single Pass and rotation speed 400 rpm and change travel speeds between 25.50, 100, 150 mm / min. In general it is found that, the best FSP is found at 400 rpm and 25 mm / min. The composite materials that have been manufactured increase Electrical resistance; increase UTS up to about 112.7%. The elongation percentage increases up to about 132%, micro-hardness number up to about 128.6% and impact energy up to about 88.2% for metal base. Both macrostructure and microstructure observations indicate homogenous microstructures of the selected composite Fabricated by FSP.3- In proving the number of Passes when a single Pass and travel speed is 150 mm/min and rotation speeds between; 400, 600, and 800 rpm. In general it is found that, the best FSP is found at 600 rpm and 50 mm/min. The composite materials that have been manufactured increase Electrical resistance; increase UTS up to about 114.4%. The elongation percentage increases up to about 135%, micro-hardness number up to about 131.7% and impact energy up to about 97.8% for metal base. Both macrostructure and microstructure observations indicate homogenous microstructures of the selected composite Fabricated by FSP.Secondly, The welding of nano-composites produced by FSP of using FSW in the changing conditions of the welding process to obtain the best conditions for FSW are as follows:1. The welding process at the speed is fixed linear and is 50 mm / min, while the rotation speed is changed 400, 600, 800 rpm.2. The welding process is done at a fixed linear speed of 25 mm / min, while the rotational speed is changed 400, 600, 800 rpm. , And in general found that the best welding friction is done at 600 l / min and 25 mm / min where it had tensile stress of 87% and 28% and elongation 107% 85% hardness 97% of the metal base. The microstructure has improved and the granules have become more precise and the weld area more homogenous.