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Title: Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission

Abstract

This work demonstrates how the structure of a grain boundary (GB) and its evolution due to slip transmission history influences subsequent dislocation transmission. First, a model for the evolution of stress fields within grain boundaries that accounts for the effects of coherent dislocation transmission is introduced. Starting with a disclination-based construct of GBs at minimum energy (equilibrium), the model describes the evolution of the GB stress field to a state characteristic of excess energy (non-equilibrium) due to the incorporation of residual Burgers vector content following sequential slip transmission events. Several essential features of this model are verified via molecular dynamics simulations of lattice dislocation absorption. Second, this model is implemented into a discrete dislocation dynamics (DDD) code and simulations are performed to understand the influence of Non-equilibrium GB stress fields, conditioned by the slip transmission history, on subsequent dislocation transmission. DDD simulations reveal that the critical resolved stress necessary for slip propagation can be reduced by with continued absorption of residual dislocation content. Moreover, DDD simulations prove that a comprehensive consideration of both the binding and driving stresses, and the evolution of the transmission configuration is necessary to quantify the influence of the mechanical state of the GB on slipmore » propagation. In general, this work provides important insights into the role of GB structure evolution, conditioned by prior deformation history, on intergranular plasticity.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; US Army Research Office (ARO)
OSTI Identifier:
1868248
Alternate Identifier(s):
OSTI ID: 1869481
Report Number(s):
LA-UR-21-31117
Journal ID: ISSN 0022-5096
Grant/Contract Number:  
89233218CNA000001; W911NF-17–1–0194
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Mechanics and Physics of Solids
Additional Journal Information:
Journal Volume: 165; Journal ID: ISSN 0022-5096
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; dislocations; grain boundaries; slip transmission

Citation Formats

Bamney, Darshan, Royce, Reyes, Capolungo, Laurent, and Spearot, Douglas E. Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission. United States: N. p., 2022. Web. doi:10.1016/j.jmps.2022.104920.
Bamney, Darshan, Royce, Reyes, Capolungo, Laurent, & Spearot, Douglas E. Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission. United States. https://doi.org/10.1016/j.jmps.2022.104920
Bamney, Darshan, Royce, Reyes, Capolungo, Laurent, and Spearot, Douglas E. Sat . "Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission". United States. https://doi.org/10.1016/j.jmps.2022.104920. https://www.osti.gov/servlets/purl/1868248.
@article{osti_1868248,
title = {Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission},
author = {Bamney, Darshan and Royce, Reyes and Capolungo, Laurent and Spearot, Douglas E.},
abstractNote = {This work demonstrates how the structure of a grain boundary (GB) and its evolution due to slip transmission history influences subsequent dislocation transmission. First, a model for the evolution of stress fields within grain boundaries that accounts for the effects of coherent dislocation transmission is introduced. Starting with a disclination-based construct of GBs at minimum energy (equilibrium), the model describes the evolution of the GB stress field to a state characteristic of excess energy (non-equilibrium) due to the incorporation of residual Burgers vector content following sequential slip transmission events. Several essential features of this model are verified via molecular dynamics simulations of lattice dislocation absorption. Second, this model is implemented into a discrete dislocation dynamics (DDD) code and simulations are performed to understand the influence of Non-equilibrium GB stress fields, conditioned by the slip transmission history, on subsequent dislocation transmission. DDD simulations reveal that the critical resolved stress necessary for slip propagation can be reduced by with continued absorption of residual dislocation content. Moreover, DDD simulations prove that a comprehensive consideration of both the binding and driving stresses, and the evolution of the transmission configuration is necessary to quantify the influence of the mechanical state of the GB on slip propagation. In general, this work provides important insights into the role of GB structure evolution, conditioned by prior deformation history, on intergranular plasticity.},
doi = {10.1016/j.jmps.2022.104920},
journal = {Journal of the Mechanics and Physics of Solids},
number = ,
volume = 165,
place = {United States},
year = {Sat May 07 00:00:00 EDT 2022},
month = {Sat May 07 00:00:00 EDT 2022}
}

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