Identifying interatomic potentials for the accurate modeling of interfacial segregation and structural transitions
Autor: | Jennifer D. Schuler, Timothy J. Rupert, Yang Hu |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
010302 applied physics
Condensed Matter - Materials Science Materials science General Computer Science Dopant Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Enthalpy of mixing 01 natural sciences Amorphous solid Hybrid Monte Carlo Computational Mathematics Molecular dynamics Mechanics of Materials Chemical physics 0103 physical sciences Nanoscale Phenomena General Materials Science Grain boundary Bond energy 0210 nano-technology |
Popis: | Chemical segregation and structural transitions at interfaces are important nanoscale phenomena, making them natural targets for atomistic modeling, yet interatomic potentials must be fit to secondary physical properties. To isolate the important factors that interatomic potentials must capture in order to accurately model such behavior, the performance of four interatomic potentials was evaluated for the Cu-Zr system, with experimental observations used to provide validation. While experimental results show strong Zr segregation to grain boundary regions and the formation of nanoscale amorphous complexions at high temperatures and/or dopant compositions, a variety of disparate behaviors can be observed in hybrid Monte Carlo/molecular dynamics simulations of doping, depending on the chosen potential. The potentials that are able to recreate the correct behavior accurately reproduce the enthalpy of mixing as well as the bond energies, providing a roadmap for the exploration of interfacial phenomena with atomistic modeling. Finally, we use our observations to find a reliable potential for the Ni-Zr system and show that this alloy should also be able to sustain amorphous complexions. 13 figures |
Databáze: | OpenAIRE |
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