Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 197, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2021.110640
Keywords
Hydrogen; Iron; Hydrogen embrittlement; Interatomic potential; Embedded atom method
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Funding
- National Natural Science Foundation of China [51271122]
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A new many-body interatomic potential for hydrogen in body-centered cubic iron is developed, which accurately describes hydrogen behaviors and interactions in iron, aiding in understanding hydrogen behavior in local accumulation areas.
We present a new many-body interatomic potential for H in body-centered cubic (bcc) Fe. The potential is developed based on extensive energetics and atomic configurations of an H atom and H-H interactions in Fe from density functional theory calculations. In detail, the potential is parameterized by fitting not only to a single H atom in the perfect bcc Fe lattice and to the properties of H trap binding to a vacancy and surfaces as being done by previous studies, but also to multiple H trapping to a vacancy and H-H interaction in Fe lattice. With such a fitting strategy, the developed potential outperforms existing potentials in its ability not only describing the behaviors of a single H atom in Fe, but also capturing the features of H-H interaction reliably, which is of key importance in revealing H behaviors in local H accumulation around dislocation cores, grain boundaries and crack tips.
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