Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations
We present an off-lattice, on-the-fly kinetic Monte Carlo (KMC) model for simulating stress-assisted diffusion and trapping of hydrogen by crystalline defects in iron. Given an embedded atom (EAM) potential as input, energy barriers for diffusion are ascertained on the fly from the local environment...
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ftcaltechauth:oai:authors.library.caltech.edu:3fbde-xtw73 2024-10-13T14:05:31+00:00 Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations Ramasubramaniam, A. Itakura, M. Ortiz, M. Carter, E. A. 2008-10 https://doi.org/10.1557/JMR.2008.0340 unknown Materials Research Society https://doi.org/10.1557/JMR.2008.0340 eprintid:12327 resolverid:CaltechAUTHORS:RAMjmr08 info:eu-repo/semantics/openAccess Other Journal of Materials Research, 23(10), 2757-2773, (2008-10) info:eu-repo/semantics/article 2008 ftcaltechauth https://doi.org/10.1557/JMR.2008.0340 2024-09-25T18:46:45Z We present an off-lattice, on-the-fly kinetic Monte Carlo (KMC) model for simulating stress-assisted diffusion and trapping of hydrogen by crystalline defects in iron. Given an embedded atom (EAM) potential as input, energy barriers for diffusion are ascertained on the fly from the local environments of H atoms. To reduce computational cost, on-the-fly calculations are supplemented with precomputed strain-dependent energy barriers in defect-free parts of the crystal. These precomputed barriers, obtained with high-accuracy density functional theory calculations, are used to ascertain the veracity of the EAM barriers and correct them when necessary. Examples of bulk diffusion in crystals containing a screw dipole and vacancies are presented. Effective diffusivities obtained from KMC simulations are found to be in good agreement with theory. Our model provides an avenue for simulating the interaction of hydrogen with cracks, dislocations, grain boundaries, and other lattice defects, over extended time scales, albeit at atomistic length scales. © 2008, Materials Research Society. (Received 25 February 2008; accepted 2 July 2008) We thank Prof. Weinan E for useful discussions. Computational resources were provided by the Arctic Region Supercomputing Center and the Maui High Performance Computing center. This work was supported by a grant from the Office of Naval Research (awarded to E.A.C.). Published - RAMjmr08.pdf Article in Journal/Newspaper Arctic Caltech Authors (California Institute of Technology) Arctic Journal of Materials Research 23 10 2757 2773 |
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We present an off-lattice, on-the-fly kinetic Monte Carlo (KMC) model for simulating stress-assisted diffusion and trapping of hydrogen by crystalline defects in iron. Given an embedded atom (EAM) potential as input, energy barriers for diffusion are ascertained on the fly from the local environments of H atoms. To reduce computational cost, on-the-fly calculations are supplemented with precomputed strain-dependent energy barriers in defect-free parts of the crystal. These precomputed barriers, obtained with high-accuracy density functional theory calculations, are used to ascertain the veracity of the EAM barriers and correct them when necessary. Examples of bulk diffusion in crystals containing a screw dipole and vacancies are presented. Effective diffusivities obtained from KMC simulations are found to be in good agreement with theory. Our model provides an avenue for simulating the interaction of hydrogen with cracks, dislocations, grain boundaries, and other lattice defects, over extended time scales, albeit at atomistic length scales. © 2008, Materials Research Society. (Received 25 February 2008; accepted 2 July 2008) We thank Prof. Weinan E for useful discussions. Computational resources were provided by the Arctic Region Supercomputing Center and the Maui High Performance Computing center. This work was supported by a grant from the Office of Naval Research (awarded to E.A.C.). Published - RAMjmr08.pdf |
format |
Article in Journal/Newspaper |
author |
Ramasubramaniam, A. Itakura, M. Ortiz, M. Carter, E. A. |
spellingShingle |
Ramasubramaniam, A. Itakura, M. Ortiz, M. Carter, E. A. Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
author_facet |
Ramasubramaniam, A. Itakura, M. Ortiz, M. Carter, E. A. |
author_sort |
Ramasubramaniam, A. |
title |
Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
title_short |
Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
title_full |
Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
title_fullStr |
Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
title_full_unstemmed |
Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations |
title_sort |
effect of atomic scale plasticity on hydrogen diffusion in iron: quantum mechanically informed and on-the-fly kinetic monte carlo simulations |
publisher |
Materials Research Society |
publishDate |
2008 |
url |
https://doi.org/10.1557/JMR.2008.0340 |
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Arctic |
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Arctic |
genre |
Arctic |
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Arctic |
op_source |
Journal of Materials Research, 23(10), 2757-2773, (2008-10) |
op_relation |
https://doi.org/10.1557/JMR.2008.0340 eprintid:12327 resolverid:CaltechAUTHORS:RAMjmr08 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1557/JMR.2008.0340 |
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Journal of Materials Research |
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23 |
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10 |
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2757 |
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2773 |
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1812811612637102080 |