Abstract
One of the different and pioneering solid‐state techniques, friction stir processing (FSP), is employed for the production of surface composites. In this research, the matrix selected was copper‐nickel (CuNi) with hard boron carbide particle as reinforcement. The objective of the current research work is to produce reinforced 90/10 copper‐nickel surface composites reinforced with B4C fabricated via FSP. The influence of tool rotational speed on macrostructure, microstructure, grain size analysis, microhardness, and wear studies of friction stir processed (FSPed) CuNi/B4C surface composites was assessed. For high rotational speed (1400 rpm) of stir tool, the modified surface area found is a maximum of 44.4 mm2 with uniform dispersion of hard particle reinforcement. The presence of hard particle in the surface area is revealed through the electron imaging and the spectroscopic results. Spectra mapping shows the uniform distribution of hard particle over the FSPed area, and the evidence is obtained with XRD analysis. From the experimentation, it is interesting to report that the reinforcements have decreased the surface hardness for an increased rotational speed of stir tool. The hardness recorded for minimum rotational speed is 223 HV which has gradually decreased to 178 HV for 1300 rpm. It has directly influenced the wear rate of modified FSPed, as hardness is directly proportional to wear behavior. The worn surface and fractured morphology of the CuNi/B4C surface composites were also studied using Field Emission Scanning Electron Microscope (FESEM).
Highlights
CuNi/B4C surface modified composites were fabricated via friction stir processing (FSP), and the influence of tool rotational speed on macrostructure, microstructure, grain size analysis, microhardness, UTS, and wear studies was investigated. e following conclusions can be drawn: (i) e maximum heat generated at stir zone was found to be 734°C, and the change in surface of parent metal is a mechanical fusion
For minimum rotational speed (1000 rpm), the surface area is found to reduce to 36.6 43 mm2. is is due to the whirling effect and the mechanical strain on the FSP area
(iii) e microhardness of CuNi/B4C surface composites is decreased when the tool rotational speed increases, which is due to the interparticle distance
Summary
One of the different and pioneering solid-state techniques, friction stir processing (FSP), is employed for the production of surface composites. E influence of tool rotational speed on macrostructure, microstructure, grain size analysis, microhardness, and wear studies of friction stir processed (FSPed) CuNi/B4C surface composites was assessed. For high rotational speed (1400 rpm) of stir tool, the modified surface area found is a maximum of 44.4 mm with uniform dispersion of hard particle reinforcement. Advances in Materials Science and Engineering typical applications are in marine and petrochemical sectors including components for ship and boat hulls, desalination plants, and heat exchangers, as well as multicore cabled tubes for hydraulic and pneumatic lines It has been selected for the superior properties of the materials [1]. Nuclear industries use boron carbide extensively due to its high neutron absorption [9]
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