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Furthermore, SEM-WDX results showed Nb rich nano-scale precipitates at interdendritic areas with spherical and oval shaped morphologies. From the microscopy results, it was also found that the microstructure consisted of a dendritic structure with the segregation of Fe and Mn in dendritic areas, while interdendritic areas were rich in Co, Cr, Ni. For example, the thermal conductivity of austenite is different from that. Additionally, the thermal conductivity, density, and specific heat capacity can be temperature dependent, and can even depend on the current phase composition.
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Microscopy observations and hardness analysis revealed insignificant microstructural variations along the thickness of both alloys. The Metal Processing Module is equipped to model heat transport by using the full heat equation in the analysis. The experimental results confirmed theoretical calculations based on Calphad method and thermodynamic rules, suggesting two solid solution high entropy alloys with FCC-crystal structure after centrifugal casting. Moreover, the thermal behaviour of both alloys was examined by differential thermal analysis technique at heating rate of 10 ☌/min up to their melting points. The chemical composition, microstructural changes and hardness were analysed using XRF, Leco-combustion technique, optical microscopy, SEM-WDX, XRD and Vickers hardness testing.
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The microstructural evolutions and hardness of two non-equiatomic multi elements CoCrFeMnNi and microalloy CoCrFeMnNiNbC high entropy alloys were studied after centrifugal casting.