Ni-W-B alloy coating containing amorphous boron particle were fabricated by direct current electrodeposition on low carbon steel substrates. The effect of boron concentration in the plating bath on the surface morphology, the overall boron content in the deposited layers and the hardness of the resulting coating layer were investigated. Scanning electron microscopy (SEM) revealed that the surface morphology of the Ni-W-B coating layer was largely modified by the boron particle loading in the electroplating suspension. Distinct nodular structures were observed in these samples. Energy dispersive X-ray spectroscopy (EDS) spectra suggested that the overall boron content in the coating layer increased with increasing boron particle loading from 1 to 3 g/L. Too high boron particle loading of 10 g/L resulted in lower overall boron content. The highest hardness of 680.86 ± 17.67 Hv was obtained from Ni-W-B/B coating layer fabricated using the boron particle loading of 5 g/L.
Aluminum alloys are used in the modern automotive industry because they are lightweight. However, it is establised that conventional fusion welding processes affect weld performance. In this study, friction stir welding (FSW), also known as solid-state welding, was used to weld dissimilar aluminum alloys, AA6061-T6 and AA5083plates. Response surface methodology based on Box-Behnken design (BBD) was used to investigate the appropriate process parameters. In this study, the effects of rotation speed (S), welding feed rate (f), and work angle (θ) were investigated. These three factors were examined at three levels over 17 experimental runs. The design was used to conduct experiments and develop mathematical regression models. Variance analysis was performed to examine the adequacy of the developed models. Finally, the effects of the process parameters on the mechanical properties of welded alloyes were investigated using mathematical models based on the macrostructure, microstructure, chemical composition, and fracture characteristics of the joints using SEM. The investigation found that the optimum welding parameters are a rotational speed of 777 rpm, welding speed of 44 mm/min, and a work angle of 0.75o. Furthermore, the results confirm that the mathematical models and experiments are consistent.
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