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The present study focuses on the synthesis, structural and magnetic characterization of CoCuFeNi high entropy alloy particles. The hydrogen reduction assisted ultrasonic spray pyrolysis method was used to synthesize nanocrystalline quaternary CoCuFeNi particles in a single step. The effect of synthesis temperature on the structure, morphology and the size of particles was investigated. The syntheses were performed at 700 °C, 800 °C, and 900 °C with 0.1 M concentration of metal nitrate salts precursor solution. The structure and morphology of products were characterized through X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometer studies. Diffraction pattern based calculations revealed that crystallite sizes of CoCuFeNi particles were in the range of 15.6–26.7 nm. Scanning electron microscopy and energy dispersive spectroscopy investigations showed that particles were agglomerated from crystallites and in spherical morphology with equiatomic elemental composition. According to vibrating sample magnetometry results, soft magnetic properties were observed for CoCuFeNi particles. X-ray photoelectron spectroscopy results showed that the surface has a thin layer of copper oxide.

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The present study focuses on the production of two kinds of composite rolls by the horizontal centrifugal casting process and the investigation of the chemical composition, microstructure, mechanical & electrochemical behaviors of the products. Alloyed white cast iron (WCI) and martensitic stainless steel (MSS) were successfully produced with this method. The chemical compositions of the produced materials were examined by X-Ray Fluorescence Analysis (XRF). The microstructural properties were examined using an optical microscope (OM). These produced rolls are developed for grinding purposes.The rolls used in the grinding process must also have higher hardness values, so Vickers hardness measurements are performed on the WCI and MSS alloys. Moreover, produced rolls intended to work in corrosive working environment as well. Due to these requirements, the corrosion resistance plays important role for these rolls. Corrosion behavior of casted samples were investigated via potentiodynamic polarization measurements.

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