In this investigation, the effect of nanoreinforcement particles such as Al2O3, tool rotational speed and traverse speed on microstructure and mechanical properties of Al/Al2O3surface nanocomposites fabricated by friction stir processing was studied. The surface nanocomposites were produced by varying volume percentage of nanoreinforcement, tool rotational speed and traverse speed to attain the best outcome. The fabricated composites were characterized through microstructural evaluation, microhardness measurements and energy dispersive spectroscopy analysis. Microstructural evaluation of the composites revealed that the composites were produced finer grain structure in this stir zone and it is evident for, a dynamic recrystallization was taken place. Higher hardness values were found at the stir zone of the entire composite because of the equiaxed and well dispersion of reinforced particles. The energy dispersive spectroscopy analysis revealed the presence of various elements at the stir zone. A defect free parameter setting for friction stir processing of Al/Al2O3was obtained at 1120 rpm and 16 mm/min.
Purpose: In this paper the Metal Matrix Composites of AL 7068 and TiC with differentproportions of (2%, 4%, 6%, 8%, and 10%) by using stir casting process, mechanicalproperties and machining responses are investigating.Design/methodology/approach: The samples are fabricated using stir casting, machiningof turning the samples by using Kilster Tool Lathe Dynamometer machining responses wereidentifying.Findings: In this research to find mechanical characterizations like flexural strength, Wearratio, impact strength, hardness, microstructure and also machining responses like surfaceroughness, cutting force, cutting power, tool wear ratio and can be optimized by multipleresponses.Research limitations/implications: This paper research about the mechanicalcharacterization and machining of AL-7068&TiC that focuses on machining responses andmicrostructures.Originality/value: By surveying the research articles the gap will be identified inAA-7068&TiC depended on machining responses and mechanical characterizations.
Metal matrix composites are supplanting conventional materials due to their prevalent properties like high strength of weight ratio, high specific stiffness, high fracture toughness, high thermal stability and wear resistance etc. In this investigation, Al-TiC composites consist of TiC particles of an average size 4μm whose wt% of reinforcement varied from 2 to 10 wt% in steps of 2 wt%, composites have been prepared using the stir casting technique. Dry-sliding wear experiments have been performed on pin-on-disc apparatus according to Taguchi’s L25 in the design of experiments. The parameters considered are wt% of TiC, rotational speed (Nr), load (P) and sliding velocity (Vs). Optimum combinations of parameters have been identified based on grey relational grade (GRG) to solve the wear response of AA7068/TiC MMCs. Also, analysis of variance (ANOVA) is applied to recognize the main factors affecting the wear response. Confirmation experiments with optimum conditions show that the results were nearer to the anticipated outcomes.
This work deals with the effect of volume percentage of nanoreinforcement to fabricate nanosurface composite by Friction Stir Processing (FSP) and also studied the role of tool rotational speed and traverse speed to get the defect free condition to fabricate successful surface composite. The material flow pattern, dispersion of the reinforcement particles in the stir zone was examined. From the phase/volume fraction analysis, it was observed that the nanoAl2O3 particles were well dispersed in the stir zone. The results indicate that the better microstructural, mechanical properties were obtained at 1150rpm /15mm/min condition. A significant improvement in microhardness was exhibited by surface nanocomposite as compared to the as - received aluminum.
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