The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy
Abstract
In this work, we investigate the operation of Frank-Read (FR) sources in a refractory multi-principal element alloy (MPEA). Simulations of discrete dislocation motion in MPEAs is enabled by the development of a phase field dislocation dynamics model that treats the atomic-scale fluctuations in lattice energies across the glide plane, present due to local ordering in the chemical composition within the nominally random MPEA atomic structure. We consider, through simulation, a range of length scales over which ordering occurs, varying from short-range lengths, a few times dislocation core width, to long-range lengths, an order of magnitude longer than the core. Characteristic of this body-centered cubic MPEA, the simulations also include screw/edge character dependence in glide resistance, as informed by atomic scale simulation. The critical stresses to activate the source for the same source size are found to be statistically distributed, as a direct consequence of the underlying variation in lattice energy. Furthermore, analysis of critical state for activating edge and screw FR sources in the MPEA reveals that FR source operation occurs via a two-step mechanism, involving athermal kink-pair formation, unlike the conventional FR source operation in a material with no composition fluctuations. This mechanism lowers the average critical stress requiredmore »
- Authors:
-
- Univ. of California, Santa Barbara, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Santa Barbara, CA (United States)
- Univ. of California, Santa Barbara, CA (United States). California NanoSystems Inst.
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Santa Barbara, CA (United States); Univ. of California, Santa Barbara, CA (United States). California NanoSystems Inst.
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); US Office of Naval Research (ONR); National Science Foundation (NSF)
- OSTI Identifier:
- 1783527
- Alternate Identifier(s):
- OSTI ID: 1659552
- Report Number(s):
- LA-UR-20-24081
Journal ID: ISSN 0749-6419
- Grant/Contract Number:
- 89233218CNA000001; N00014-18-1-2392; CNS-1725797; DMR 1720256
- Resource Type:
- Accepted Manuscript
- Journal Name:
- International Journal of Plasticity
- Additional Journal Information:
- Journal Volume: 134; Journal ID: ISSN 0749-6419
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; dislocations; dynamics; inhomogeneous material; metallic material; medium entropy alloy
Citation Formats
Smith, Lauren Taylor Wisbey, Su, Yanqing, Xu, Shuozhi, Hunter, Abigail, and Beyerlein, Irene Jane. The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy. United States: N. p., 2020.
Web. doi:10.1016/j.ijplas.2020.102850.
Smith, Lauren Taylor Wisbey, Su, Yanqing, Xu, Shuozhi, Hunter, Abigail, & Beyerlein, Irene Jane. The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy. United States. https://doi.org/10.1016/j.ijplas.2020.102850
Smith, Lauren Taylor Wisbey, Su, Yanqing, Xu, Shuozhi, Hunter, Abigail, and Beyerlein, Irene Jane. Tue .
"The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy". United States. https://doi.org/10.1016/j.ijplas.2020.102850. https://www.osti.gov/servlets/purl/1783527.
@article{osti_1783527,
title = {The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy},
author = {Smith, Lauren Taylor Wisbey and Su, Yanqing and Xu, Shuozhi and Hunter, Abigail and Beyerlein, Irene Jane},
abstractNote = {In this work, we investigate the operation of Frank-Read (FR) sources in a refractory multi-principal element alloy (MPEA). Simulations of discrete dislocation motion in MPEAs is enabled by the development of a phase field dislocation dynamics model that treats the atomic-scale fluctuations in lattice energies across the glide plane, present due to local ordering in the chemical composition within the nominally random MPEA atomic structure. We consider, through simulation, a range of length scales over which ordering occurs, varying from short-range lengths, a few times dislocation core width, to long-range lengths, an order of magnitude longer than the core. Characteristic of this body-centered cubic MPEA, the simulations also include screw/edge character dependence in glide resistance, as informed by atomic scale simulation. The critical stresses to activate the source for the same source size are found to be statistically distributed, as a direct consequence of the underlying variation in lattice energy. Furthermore, analysis of critical state for activating edge and screw FR sources in the MPEA reveals that FR source operation occurs via a two-step mechanism, involving athermal kink-pair formation, unlike the conventional FR source operation in a material with no composition fluctuations. This mechanism lowers the average critical stress required to activate the FR source and causes the statistical dispersion in critical stress to depend on the range of composition ordering. More importantly, it leads to a more severe dependence of source strength on FR source length than predicted by line tension alone.},
doi = {10.1016/j.ijplas.2020.102850},
journal = {International Journal of Plasticity},
number = ,
volume = 134,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2020},
month = {Tue Sep 01 00:00:00 EDT 2020}
}
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