Journal
SOLID STATE COMMUNICATIONS
Volume 325, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2020.114158
Keywords
Tungsten; Iron; Self-interstitial atom; Migration; Molecular dynamics simulations
Categories
Funding
- National Natural Science Foundation of China [11175124]
- National Magnetic Confinement Fusion Program of China [2013GB109000]
- Key Scientific Research Project in Colleges and Universities of Henan Province, China [20A490001]
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This study investigates the migration behavior of self-interstitial defects in W and Fe using molecular dynamics simulations, revealing a transition in migration mechanism from one-dimensional to three-dimensional with increasing temperature in W, while observing three-dimensional migration in Fe with lower migration energy for tri-interstitial compared to single- and di-interstitial defects. Different <111> configurations are found during tri-interstitial migration at higher temperatures in both W and Fe.
Based on the basic characteristic of self-interstitial defect, we propose a new method for locating self-interstitial defect in body centered cubic transition metals, with which the migration behavior of self-interstitial defects with up to three self-interstitial atoms in W and Fe is investigated over a wide range of temperatures by molecular dynamics simulations. With increasing temperature, the migration of self-interstitial defects in W exhibits a change in mechanism from one-dimensional to three-dimensional. The one-dimensional diffusion coefficients rise linearly with temperature. For self-interstitial defects in Fe, the three-dimensional migration is observed, and the obtained migration energy of the tri-interstitial is lower than that of the single- and di-interstitial. During the tri-interstitial migration, several different < 111 > configurations are found with increasing temperature in both W and Fe.
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