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This study investigates the microhardness and corrosion properties of friction stir welded (FSW) joints in phosphor bronze (CuSn4), a vital non-ferrous alloy in engineering applications. The research delves into the fsw process, employing varying welding parameters to create joints that exhibit distinct microstructural characteristics. Microhardness distribution across the fsw joints is assessed and correlated with the base material's properties. corrosion behaviour is rigorously examined through weight loss tests, revealing insights into the susceptibility of FSW joints to various corrosive environments. The study identifies the influence of FSW parameters on microhardness and corrosion performance, thus contributing to understanding the alloy's behaviour under this welding technique. this research shows that the welding speed of 0.25 mm/s, tool rotational speed of 1100 rpm, plunger depth of 0.2 mm, and a hexagonal tool profile produce the better joint with the highest microhardness of 139 HV and rate of corrosion of 0.420831 %. [ABSTRACT FROM AUTHOR]

The review offers a comprehensive analysis of additive manufacturing (AM) processes in the application of high-entropy alloys (HEAs). HEAs have gained considerable attention in recent years due to their unique mechanical and physical properties. We provide the historical background and a clear definition of HEAs, outlining their development over time. The focus is concentrated on examining the utilization of AM processes in HEAs. Specifically, three prominent AM techniques are discussed: electron-beam processes, laser-processed HEAs, and wire-arc additive manufacturing. Each technique is explored in detail, including its advantages, restrictions, and current applications within the HEAs field. An attention is stressed on the significance of AM-process parameters during the fabrication of HEAs. Parameters such as laser power, scanning speed, and powder-feed rate are analysed for their influences on the microstructure and mechanical properties of the final product. The post-processing techniques for additive-manufactured HEAs are considered. The importance of steps such as heat treatment, surface finishing, and machining in achieving the desired material properties and dimensional accuracy in AMproduced HEA components is underlined. Overviewing the HEAs, their application in AM processes, the influence of process parameters, and post-processing considerations, this work can act as a useful source of information for researchers on the way to amendment of the understanding and implementation of AM in the HEAs. [ABSTRACT FROM AUTHOR]