Cobalt-Nickel alloys have been widely used for decoration, in magnetic recording devices and corrosion resistance applications, etc. In this study, the influences of cobalt amount in electrolyte on the magnetic and structural properties of the electrodeposited Co-Ni alloys were investigated. An electrolyte solution, consisting of cobalt sulfate, nickel sulfate, nickel chloride and boric acid, was used in electrodeposition. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. The morphological and structural analyses of the alloys were performed using inductively coupled plasma, scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer techniques. The effect of cobalt concentration on the magnetic properties, phase structure and grain size of the alloys was investigated. Magnetic hysteresis results indicate that the amount of the cobalt content in the electrolyte has a strong influence on the ferromagnetic behavior of fabricated alloys. Results of the study show that changing the electrodeposition parameters, such as composition of electrolyte solution, allows to fabricate alloys with different properties.
The production of nanoparticles as thin film coating performed with electrodeposition method is easier and cheaper than other methods. Because, thin film production can be controlled with the change of ingredients in the bath composition. In this study, Co, Ni, and CoNi alloy thin films were fabricated with electrodeposition method through the bath composition that consists of cobalt sulphate (CoSO4.7H2O), nickel sulphate (NiSO4.6H2O), nickel (II) chloride (NiCl2 6H2O) and boric acid (H3BO3). Crystal structure (XRD), morphological (SEM), elemental composition (ICP) and magnetic properties (VSM) of the fabricated thin films were investigated. Chemical properties of coating bath (CV) was examined as well. Magnetization measurements of the thin films were performed by applying magnetic fields between + 75000 Oe and -75000 Oe and then hysteresis loops were obtained. The Co, Ni, and CoNi films showed ferromagnetic material properties. Coercivity (Hc), permanent magnetization (Mr), saturation magnetization (Ms) values of these alloys were significantly affected by the amount of the cobalt, magneto crystal anisotropy and grain size. It was understood that some materials having hard and soft magnetic properties can be fabricated by controlling the bath composition.
Super alloys appear as indispensable materials in areas where engineering alloys are used today. What makes these alloys indispensable is that other engineering alloys cannot show the desired mechanical properties under the desired temperature conditions. Especially nickel-based super alloys have become indispensable materials for the aviation industry. While most of the engineering alloys exhibit poor resistance and poor creep behavior at high temperatures, nickel-based super alloys show good strength and good creep behavior even at high temperatures (up to about 650 °C). One of the biggest reasons for the production of the turbine blades in the front of the aircraft engines from nickel-based super alloys is good resistance even in variable temperature conditions (air temperature is around -50 °C when the aircraft is 11 km above the ground and 25 °C at sea level), toughness and good creep properties. While the Inconel 718 alloy gives these strength properties, precipitation hardening mechanism is utilized. This study was made to show how Inconel 718 exhibits mechanical behavior under desired temperature conditions, and to indicate which mechanisms it utilizes while exhibiting these properties, turbine blade design was made in student version of SIEMENS SOLID EDGE. In addition, this design has been analyzed in the ANSYS student version.
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