Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales
Abstract
Abstract The Portevin-Le Chatelier (PLC) effect is a phenomenon by which plastic slip in metallic materials becomes unstable, resulting in jerky flow and the onset of inhomogeneous deformation. The PLC effect is thought to be fundamentally caused by the dynamic interplay between dislocations and solute atoms. However, this interplay is almost always inaccessible experimentally due to the extremely fine length and time scales over which it occurs. In this paper, simulations of jerky flow in W-O interstitial solid solutions reveal three dynamic regimes emerging from the simulated strain rate-temperature space: one resembling standard solid solution strengthening, another one mimicking solute cloud formation, and a third one where dislocation/solute coevolution leads to jerky flow as a precursor of dynamic strain aging. The simulations are carried out in a stochastic framework that naturally captures rare events in a rigorous manner, providing atomistic resolution over diffusive time scales using no adjustable parameters.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1619582
- Alternate Identifier(s):
- OSTI ID: 1802472
- Grant/Contract Number:
- SC0012774
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Science & Technology - Other Topics
Citation Formats
Zhao, Yue, Dezerald, Lucile, Pozuelo, Marta, Zhou, Xinran, and Marian, Jaime. Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales. United Kingdom: N. p., 2020.
Web. doi:10.1038/s41467-020-15085-3.
Zhao, Yue, Dezerald, Lucile, Pozuelo, Marta, Zhou, Xinran, & Marian, Jaime. Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales. United Kingdom. https://doi.org/10.1038/s41467-020-15085-3
Zhao, Yue, Dezerald, Lucile, Pozuelo, Marta, Zhou, Xinran, and Marian, Jaime. Fri .
"Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales". United Kingdom. https://doi.org/10.1038/s41467-020-15085-3.
@article{osti_1619582,
title = {Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales},
author = {Zhao, Yue and Dezerald, Lucile and Pozuelo, Marta and Zhou, Xinran and Marian, Jaime},
abstractNote = {Abstract The Portevin-Le Chatelier (PLC) effect is a phenomenon by which plastic slip in metallic materials becomes unstable, resulting in jerky flow and the onset of inhomogeneous deformation. The PLC effect is thought to be fundamentally caused by the dynamic interplay between dislocations and solute atoms. However, this interplay is almost always inaccessible experimentally due to the extremely fine length and time scales over which it occurs. In this paper, simulations of jerky flow in W-O interstitial solid solutions reveal three dynamic regimes emerging from the simulated strain rate-temperature space: one resembling standard solid solution strengthening, another one mimicking solute cloud formation, and a third one where dislocation/solute coevolution leads to jerky flow as a precursor of dynamic strain aging. The simulations are carried out in a stochastic framework that naturally captures rare events in a rigorous manner, providing atomistic resolution over diffusive time scales using no adjustable parameters.},
doi = {10.1038/s41467-020-15085-3},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United Kingdom},
year = {Fri Mar 06 00:00:00 EST 2020},
month = {Fri Mar 06 00:00:00 EST 2020}
}
https://doi.org/10.1038/s41467-020-15085-3
Web of Science
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