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- W3136644687 abstract "In this study Mo-Nb-Ta-W refractory high-entropy alloys (R-HEAs) have been studied for their phase stability for a wide temperature range (100 K to 2000 K). The equilibrium thermodynamic phases are determined by the changes in enthalpy and entropy. The enthalpy changes at any temperature are simulated by embedded atom method (EAM) potential based hybrid Monte Carlo molecular dynamics (MC/MD) simulations. Configurational entropy was calculated by quasichemical method. The EAM potentials were all calculated based on the physical input parameters of elements like atomic volume, cohesive energy, elastic constants etc. It was found that the MC/MD evolved equilibrium structures and the degree of local chemical short-range order/clustering (SRO/SRC) largely depend on the ordering enthalpies for various temperatures. The ordering transition temperature is close to 700 K, which is also substantiated by the experimental powder X-ray diffractions done in synchrotron beam. Large increase of degree of next-neighbor B2-type ordering of Mo-Ta pairs and decrease of that Nb-W pairs were observed. This was also expected from the trends of density functional theory (DFT) based ab-initio simulations done in the literature and discussed in this work. The simulated diffraction pattern and changes in scattering intensity due to the chemical SRO and SRC was investigated. The diffraction trends were explained with the help of the features of the evolved nanostructure morphology. The developed methodologies may be helpful in prior prediction of long-term phase stability in multi-element alloys by reducing the number of costly experiments." @default.
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- W3136644687 date "2021-03-14" @default.
- W3136644687 modified "2023-09-23" @default.
- W3136644687 title "Temperature dependent phase stability of Mo-Nb-Ta-W refractory high-entropy alloys" @default.
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