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Title: 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:
; ORCiD logo; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1619582
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

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. https://doi.org/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 = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1038/s41467-020-15085-3

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