In-situ observation of nano-oxide and defect evolution in 14YWT alloys
Abstract
Nanostructured ferritic alloys (NFAs) are considered as candidates for structural components in advanced nuclear reactors due to their excellent radiation resistance as a result of a high density of nano-oxides (NOs) in the microstructure. Therefore, gaining an understanding on the stability of NOs under irradiation is crucial. In this study, we have investigated the evolution of defects and NOs in 14YWT NFAs under in-situ Kr ion irradiation at room temperature (RT) and 450°C up to 10 dpa. It has been found that irradiations at 450°C do not create any changes in the NOs, similar to the bulk irradiations. On the other hand, elemental mapping indicates that NOs dissolve mostly after 10 dpa irradiations at RT. Thus, while defects are both annihilated and pinned by NOs at low doses (before the dissolution of NOs), glissile loops start to escape to the foil surface at high doses (after the dissolution of NOs), justifying the significantly low fraction of (111) loops compared to the literature values. Furthermore, high resolution transmission electron microscopy analysis has shown that the NOs are mostly coherent Y2Ti2O7 particles with pyrochlore crystal structure after both RT and 450°C irradiations, similar to those observed before irradiation.
- Authors:
-
[2];
[2]
- Middle East Technical Univ., Ankara (Turkey)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1671106
- Alternate Identifier(s):
- OSTI ID: 1774638; OSTI ID: 1778598
- Report Number(s):
- LA-UR-20-24744
Journal ID: ISSN 1044-5803
- Grant/Contract Number:
- 89233218CNA000001; AC07-07JD14517; AC52-06NA25396; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Characterization
- Additional Journal Information:
- Journal Volume: 170; Journal ID: ISSN 1044-5803
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Nano-structured ferritic alloys (NFAs); Nano-oxides (NOs); In-situ irradiation; Dislocation loops; Radiation induced dissolution; Defect annihilation
Citation Formats
Aydogan, E., El-Atwani, O., Li, M., and Maloy, S. A. In-situ observation of nano-oxide and defect evolution in 14YWT alloys. United States: N. p., 2020.
Web. doi:10.1016/j.matchar.2020.110686.
Aydogan, E., El-Atwani, O., Li, M., & Maloy, S. A. In-situ observation of nano-oxide and defect evolution in 14YWT alloys. United States. https://doi.org/10.1016/j.matchar.2020.110686
Aydogan, E., El-Atwani, O., Li, M., and Maloy, S. A. Thu .
"In-situ observation of nano-oxide and defect evolution in 14YWT alloys". United States. https://doi.org/10.1016/j.matchar.2020.110686. https://www.osti.gov/servlets/purl/1671106.
@article{osti_1671106,
title = {In-situ observation of nano-oxide and defect evolution in 14YWT alloys},
author = {Aydogan, E. and El-Atwani, O. and Li, M. and Maloy, S. A.},
abstractNote = {Nanostructured ferritic alloys (NFAs) are considered as candidates for structural components in advanced nuclear reactors due to their excellent radiation resistance as a result of a high density of nano-oxides (NOs) in the microstructure. Therefore, gaining an understanding on the stability of NOs under irradiation is crucial. In this study, we have investigated the evolution of defects and NOs in 14YWT NFAs under in-situ Kr ion irradiation at room temperature (RT) and 450°C up to 10 dpa. It has been found that irradiations at 450°C do not create any changes in the NOs, similar to the bulk irradiations. On the other hand, elemental mapping indicates that NOs dissolve mostly after 10 dpa irradiations at RT. Thus, while defects are both annihilated and pinned by NOs at low doses (before the dissolution of NOs), glissile loops start to escape to the foil surface at high doses (after the dissolution of NOs), justifying the significantly low fraction of (111) loops compared to the literature values. Furthermore, high resolution transmission electron microscopy analysis has shown that the NOs are mostly coherent Y2Ti2O7 particles with pyrochlore crystal structure after both RT and 450°C irradiations, similar to those observed before irradiation.},
doi = {10.1016/j.matchar.2020.110686},
journal = {Materials Characterization},
number = ,
volume = 170,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 2020},
month = {Thu Oct 01 00:00:00 EDT 2020}
}
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