Homogeneous hydride formation path in α-Zr: Molecular dynamics simulations with the charge-optimized many-body potential
Abstract
A formation path for homogeneous γ hydride formation in hcp α-Zr, from solid solution to the ζ and then the γ hydride, was demonstrated using molecular static calculations and molecular dynamic simulations with the charge-optimized many-body (COMB) potential. Hydrogen has limited solubility in α-Zr. Once the solubility limit is exceeded, the stability of solid solution gives way to that of coherent hydride phases such as the ζ hydride by planar precipitation of hydrogen. At finite temperatures, the ζ hydride goes through a partial hcp-fcc transformation via 1/3 <1¯100> slip on the basal plane, and transforms into a mixture of γ hydride and α-Zr. In the ζ hydride, slip on the basal plane is favored thermodynamically with negligible barrier, and is therefore feasible at finite temperatures without mechanical loading. The transformation process involves slips of three equivalent shear partials, in contrast to that proposed in the literature where only a single shear partial was involved. The adoption of multiple slip partials minimizes the macroscopic shape change of embedded hydride clusters and the shear strain accumulation in the matrix, and thus reduces the overall barrier needed for homogeneous γ hydride formation. In conclusion, this formation path requires finite temperatures for hydrogen diffusionmore »
- Authors:
- Publication Date:
- Research Org.:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1303259
- Alternate Identifier(s):
- OSTI ID: 1357668
- Report Number(s):
- INL/JOU-15-35749
Journal ID: ISSN 1359-6454; PII: S1359645416302555
- Grant/Contract Number:
- AC07-05ID14517; 14-026
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 111; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 36 MATERIALS SCIENCE; zirconium; hydride; molecular dynamics
Citation Formats
Zhang, Yongfeng, Bai, Xian-Ming, Yu, Jianguo, Tonks, Michael R., Noordhoek, Mark J., and Phillpot, Simon R. Homogeneous hydride formation path in α-Zr: Molecular dynamics simulations with the charge-optimized many-body potential. United States: N. p., 2016.
Web. doi:10.1016/j.actamat.2016.03.079.
Zhang, Yongfeng, Bai, Xian-Ming, Yu, Jianguo, Tonks, Michael R., Noordhoek, Mark J., & Phillpot, Simon R. Homogeneous hydride formation path in α-Zr: Molecular dynamics simulations with the charge-optimized many-body potential. United States. https://doi.org/10.1016/j.actamat.2016.03.079
Zhang, Yongfeng, Bai, Xian-Ming, Yu, Jianguo, Tonks, Michael R., Noordhoek, Mark J., and Phillpot, Simon R. Wed .
"Homogeneous hydride formation path in α-Zr: Molecular dynamics simulations with the charge-optimized many-body potential". United States. https://doi.org/10.1016/j.actamat.2016.03.079. https://www.osti.gov/servlets/purl/1303259.
@article{osti_1303259,
title = {Homogeneous hydride formation path in α-Zr: Molecular dynamics simulations with the charge-optimized many-body potential},
author = {Zhang, Yongfeng and Bai, Xian-Ming and Yu, Jianguo and Tonks, Michael R. and Noordhoek, Mark J. and Phillpot, Simon R.},
abstractNote = {A formation path for homogeneous γ hydride formation in hcp α-Zr, from solid solution to the ζ and then the γ hydride, was demonstrated using molecular static calculations and molecular dynamic simulations with the charge-optimized many-body (COMB) potential. Hydrogen has limited solubility in α-Zr. Once the solubility limit is exceeded, the stability of solid solution gives way to that of coherent hydride phases such as the ζ hydride by planar precipitation of hydrogen. At finite temperatures, the ζ hydride goes through a partial hcp-fcc transformation via 1/3 <1¯100> slip on the basal plane, and transforms into a mixture of γ hydride and α-Zr. In the ζ hydride, slip on the basal plane is favored thermodynamically with negligible barrier, and is therefore feasible at finite temperatures without mechanical loading. The transformation process involves slips of three equivalent shear partials, in contrast to that proposed in the literature where only a single shear partial was involved. The adoption of multiple slip partials minimizes the macroscopic shape change of embedded hydride clusters and the shear strain accumulation in the matrix, and thus reduces the overall barrier needed for homogeneous γ hydride formation. In conclusion, this formation path requires finite temperatures for hydrogen diffusion without mechanical loading. Therefore, it should be effective at the cladding operating conditions.},
doi = {10.1016/j.actamat.2016.03.079},
journal = {Acta Materialia},
number = C,
volume = 111,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}
Web of Science
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