Assessing the predictive capabilities of precipitation strengthening models for deformation twinning in Mg alloys using phase-field simulations
Abstract
Precipitation strengthening is a key strategy for improving the overall mechanical properties of Mg alloys. In Mg-Al alloys, basal precipitates are known to strengthen against twinning, resulting in an increase in the critical resolved shear stress (CRSS) necessary for continued deformation. Although several models have been proposed to quantify the influence of precipitate shape, size, and distribution on the CRSS, the accuracy, scope, and applicability of these models has not been fully assessed. Accordingly, the objectives of this study are: (i) to analyze the accuracy of analytical models proposed in the literature for precipitation strengthening against twin thickening and propagation (in Mg-Al alloys) using phase-field (PF) simulations, (ii) to propose modifications to these model forms to better capture the observed trends in the PF data, and (iii) to subsequently test the predictiveness of the extended models in extrapolating to experimental strengthening data. First, using an atomistically-informed phase-field method, the interactions between migrating twin boundaries (during the propagation and thickening stages) and basal plates are simulated for different precipitate sizes and arrangements. In general, comparison of the increase in CRSS determined from the PF simulations and the predictions from four precipitation strengthening models reveals that modifications are necessary to the modelmore »
- Authors:
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1995864
- Alternate Identifier(s):
- OSTI ID: 1995152
- Report Number(s):
- LA-UR-23-21653
Journal ID: ISSN 2213-9567; S2213956723001494; PII: S2213956723001494
- Grant/Contract Number:
- FWP 06SCPE401; 89233218CNA000001
- Resource Type:
- Published Article
- Journal Name:
- Journal of Magnesium and Alloys
- Additional Journal Information:
- Journal Name: Journal of Magnesium and Alloys Journal Volume: 11 Journal Issue: 12; Journal ID: ISSN 2213-9567
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Twinning; Twin precipitate interactions; Strengthening; Magnesium alloys; Phase field; Mechanical behavior
Citation Formats
Bamney, Darshan, and Capolungo, Laurent. Assessing the predictive capabilities of precipitation strengthening models for deformation twinning in Mg alloys using phase-field simulations. Netherlands: N. p., 2023.
Web. doi:10.1016/j.jma.2023.07.008.
Bamney, Darshan, & Capolungo, Laurent. Assessing the predictive capabilities of precipitation strengthening models for deformation twinning in Mg alloys using phase-field simulations. Netherlands. https://doi.org/10.1016/j.jma.2023.07.008
Bamney, Darshan, and Capolungo, Laurent. Fri .
"Assessing the predictive capabilities of precipitation strengthening models for deformation twinning in Mg alloys using phase-field simulations". Netherlands. https://doi.org/10.1016/j.jma.2023.07.008.
@article{osti_1995864,
title = {Assessing the predictive capabilities of precipitation strengthening models for deformation twinning in Mg alloys using phase-field simulations},
author = {Bamney, Darshan and Capolungo, Laurent},
abstractNote = {Precipitation strengthening is a key strategy for improving the overall mechanical properties of Mg alloys. In Mg-Al alloys, basal precipitates are known to strengthen against twinning, resulting in an increase in the critical resolved shear stress (CRSS) necessary for continued deformation. Although several models have been proposed to quantify the influence of precipitate shape, size, and distribution on the CRSS, the accuracy, scope, and applicability of these models has not been fully assessed. Accordingly, the objectives of this study are: (i) to analyze the accuracy of analytical models proposed in the literature for precipitation strengthening against twin thickening and propagation (in Mg-Al alloys) using phase-field (PF) simulations, (ii) to propose modifications to these model forms to better capture the observed trends in the PF data, and (iii) to subsequently test the predictiveness of the extended models in extrapolating to experimental strengthening data. First, using an atomistically-informed phase-field method, the interactions between migrating twin boundaries (during the propagation and thickening stages) and basal plates are simulated for different precipitate sizes and arrangements. In general, comparison of the increase in CRSS determined from the PF simulations and the predictions from four precipitation strengthening models reveals that modifications are necessary to the model forms to extend their applicability to precipitation strengthening against both twin thickening and propagation. A subsequent comparison between predictions from the extended models and experimental strengthening data for peak age-hardened samples reveals that the (extended) single dislocation and dislocation wall models provide reasonably accurate values of the increase in CRSS. Ultimately, the results presented here help elucidate the fidelity and applicability of the various hardening models in predicting precipitation strenghtening effects in technologically important alloys.},
doi = {10.1016/j.jma.2023.07.008},
journal = {Journal of Magnesium and Alloys},
number = 12,
volume = 11,
place = {Netherlands},
year = {Fri Dec 01 00:00:00 EST 2023},
month = {Fri Dec 01 00:00:00 EST 2023}
}
https://doi.org/10.1016/j.jma.2023.07.008
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