Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys
Abstract
A three-dimensional elastoplastic phase-field model is developed, using the Finite Element Method (FEM), for modeling the athermal beta to omega phase transformation in Zr–Nb alloys by including plastic deformation and strain hardening of the material. The microstructure evolution during athermal transformation as well as under different stress states, e.g. uni-axial tensile and compressive, bi-axial tensile and compressive, shear and tri-axial loadings, is studied. The effects of plasticity, stress states and the stress loading direction on the microstructure evolution as well as on the mechanical properties are studied. The input data corresponding to a Zr – 8 at.% Nb alloy are acquired from experimental studies as well as by using the CALPHAD method. Our simulations show that the four different omega variants grow as ellipsoidal shaped particles. Our results show that due to stress relaxation, the athermal phase transformation occurs slightly more readily in the presence of plasticity compared to that in its absence. The evolution of omega phase is different under different stress states, which leads to the differences in the mechanical properties of the material. The variant selection mechanism, i.e. formation of different variants under different stress loading directions, is also nicely captured by our model.
- Authors:
-
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1193641
- Alternate Identifier(s):
- OSTI ID: 1249879
- Report Number(s):
- LA-UR-14-26568
Journal ID: ISSN 0921-5093; PII: S0921509315002683
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 634; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; 36 MATERIALS SCIENCE; phase-field method; diffusionless phase transformation; omega phase; microstructure; zirconium-niobium alloys
Citation Formats
Yeddu, Hemantha Kumar, and Lookman, Turab. Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys. United States: N. p., 2015.
Web. doi:10.1016/j.msea.2015.03.035.
Yeddu, Hemantha Kumar, & Lookman, Turab. Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys. United States. https://doi.org/10.1016/j.msea.2015.03.035
Yeddu, Hemantha Kumar, and Lookman, Turab. Fri .
"Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys". United States. https://doi.org/10.1016/j.msea.2015.03.035. https://www.osti.gov/servlets/purl/1193641.
@article{osti_1193641,
title = {Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys},
author = {Yeddu, Hemantha Kumar and Lookman, Turab},
abstractNote = {A three-dimensional elastoplastic phase-field model is developed, using the Finite Element Method (FEM), for modeling the athermal beta to omega phase transformation in Zr–Nb alloys by including plastic deformation and strain hardening of the material. The microstructure evolution during athermal transformation as well as under different stress states, e.g. uni-axial tensile and compressive, bi-axial tensile and compressive, shear and tri-axial loadings, is studied. The effects of plasticity, stress states and the stress loading direction on the microstructure evolution as well as on the mechanical properties are studied. The input data corresponding to a Zr – 8 at.% Nb alloy are acquired from experimental studies as well as by using the CALPHAD method. Our simulations show that the four different omega variants grow as ellipsoidal shaped particles. Our results show that due to stress relaxation, the athermal phase transformation occurs slightly more readily in the presence of plasticity compared to that in its absence. The evolution of omega phase is different under different stress states, which leads to the differences in the mechanical properties of the material. The variant selection mechanism, i.e. formation of different variants under different stress loading directions, is also nicely captured by our model.},
doi = {10.1016/j.msea.2015.03.035},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 634,
place = {United States},
year = {Fri May 01 00:00:00 EDT 2015},
month = {Fri May 01 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
Formation of stress- and thermal-induced martensitic nanostructures in a single crystal with phase-dependent elastic properties
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