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Title: α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys

Abstract

Nanostructured ferritic alloys are considered as candidates for structural components in advanced nuclear reactors due to a high density of nano-oxides (NOs) and ultrafine grain sizes. However, bimodal grain size distribution results in inhomogeneous NO distribution, or vice versa. Here, we report that density of NOs in small grains (<0.5 µm) is high while there are almost no NOs inside the large grains (>2 µm) before and after irradiation. After 6 dpa neutron irradiation at 385–430 °C, α' precipitation has been observed in these alloys; however, their size and number densities vary considerably in small and large grains. In this study, we have investigated the precipitation kinetics of α' particles based on the sink density, using both transmission electron microscopy and kinetic Monte Carlo simulations. Furthermore, it has been found that in the presence of a low sink density, α' particles form and grow faster due to the existence of a larger defect density in the matrix. On the other hand, while α' particles form far away from the sink interface when the sink size is small, Cr starts to segregate at the sink interface with the increase in the sink size. Additionally, grain boundary characteristics are found to determinemore » the radiation-induced segregation of Cr.« less

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [4];  [4]; ORCiD logo [2]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sabanci Univ., Istanbul (Turkey)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Arizona State Univ., Tempe, AZ (United States)
  4. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1532729
Report Number(s):
LA-UR-19-24571
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

Citation Formats

Aydogan, Eda, Martinez, Enrique Saez, March, K., El-Atwani, Osman, Krumwiede, D. L., Hosemann, Peter, Saleh, Tarik A., and Maloy, Stuart Andrew. α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys. United States: N. p., 2019. Web. doi:10.1038/s41598-019-44508-5.
Aydogan, Eda, Martinez, Enrique Saez, March, K., El-Atwani, Osman, Krumwiede, D. L., Hosemann, Peter, Saleh, Tarik A., & Maloy, Stuart Andrew. α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys. United States. doi:10.1038/s41598-019-44508-5.
Aydogan, Eda, Martinez, Enrique Saez, March, K., El-Atwani, Osman, Krumwiede, D. L., Hosemann, Peter, Saleh, Tarik A., and Maloy, Stuart Andrew. Thu . "α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys". United States. doi:10.1038/s41598-019-44508-5. https://www.osti.gov/servlets/purl/1532729.
@article{osti_1532729,
title = {α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys},
author = {Aydogan, Eda and Martinez, Enrique Saez and March, K. and El-Atwani, Osman and Krumwiede, D. L. and Hosemann, Peter and Saleh, Tarik A. and Maloy, Stuart Andrew},
abstractNote = {Nanostructured ferritic alloys are considered as candidates for structural components in advanced nuclear reactors due to a high density of nano-oxides (NOs) and ultrafine grain sizes. However, bimodal grain size distribution results in inhomogeneous NO distribution, or vice versa. Here, we report that density of NOs in small grains (<0.5 µm) is high while there are almost no NOs inside the large grains (>2 µm) before and after irradiation. After 6 dpa neutron irradiation at 385–430 °C, α' precipitation has been observed in these alloys; however, their size and number densities vary considerably in small and large grains. In this study, we have investigated the precipitation kinetics of α' particles based on the sink density, using both transmission electron microscopy and kinetic Monte Carlo simulations. Furthermore, it has been found that in the presence of a low sink density, α' particles form and grow faster due to the existence of a larger defect density in the matrix. On the other hand, while α' particles form far away from the sink interface when the sink size is small, Cr starts to segregate at the sink interface with the increase in the sink size. Additionally, grain boundary characteristics are found to determine the radiation-induced segregation of Cr.},
doi = {10.1038/s41598-019-44508-5},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {6}
}

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Works referenced in this record:

Recent Developments in Irradiation-Resistant Steels
journal, August 2008


Core/shell structures of oxygen-rich nanofeatures in oxide-dispersion strengthened Fe–Cr alloys
journal, November 2008

  • Marquis, Emmanuelle A.
  • Applied Physics Letters, Vol. 93, Issue 18, Article No. 181904
  • DOI: 10.1063/1.3000965