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Title: Microstructure evolution of T91 irradiated in the BOR60 fast reactor

Abstract

In this paper, microstructures of T91 neutron irradiated in the BOR60 reactor at five temperatures between 376 °C and 524 °C to doses between 15.4 and 35.1 dpa were characterized using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and atom probe tomography (APT). Type a<100> dislocation loops were observed at 376–415 °C and network dislocations dominated at 460 °C and 524 °C. Cavities appeared in a bimodal distribution with a high density of small bubbles less than 2 nm at irradiation temperatures between 376 °C and 415 °C. Small bubbles were also observed at 460 °C and 524 °C but cavities greater than 2 nm were absent. Enrichment of Cr, Ni, and Si at the grain boundary was observed at all irradiation temperatures. Radiation-induced segregation (RIS) of Cr, Ni and Si appeared to saturate at 17.1 dpa and 376 °C. The temperature dependence of RIS of Cr, Ni and Si at the grain boundary, which showed a peak Cr enrichment temperature of 460 °C and a lower peak Ni and Si enrichment temperature of ~400 °C, was consistent with observations of RIS of Cr in proton irradiated T91, suggesting that the same RIS mechanism may also apply tomore » BOR60 irradiated T91. G-phase and Cu-rich precipitates were observed at 376–415 °C but were absent at 460 °C and 524 °C. Finally, the absence of G-phase at 524 °C could be related to the minimal segregation of Ni and Si in that condition.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [3];  [3];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Univ. of Oxford (United Kingdom). Dept. of Materials
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Oxford (United Kingdom)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7); USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1432160
Grant/Contract Number:
AC05-00OR22725; AC07-05ID14517; NE0000639; EP/L025817/1; EP/M022803/1
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 504; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 36 MATERIALS SCIENCE; microstructure; radiation-induced segregation; swelling; radiation-induced precipitates

Citation Formats

Jiao, Z., Taller, S., Field, K., Yeli, G., Moody, M. P., and Was, G. S. Microstructure evolution of T91 irradiated in the BOR60 fast reactor. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.03.024.
Jiao, Z., Taller, S., Field, K., Yeli, G., Moody, M. P., & Was, G. S. Microstructure evolution of T91 irradiated in the BOR60 fast reactor. United States. doi:10.1016/j.jnucmat.2018.03.024.
Jiao, Z., Taller, S., Field, K., Yeli, G., Moody, M. P., and Was, G. S. Wed . "Microstructure evolution of T91 irradiated in the BOR60 fast reactor". United States. doi:10.1016/j.jnucmat.2018.03.024.
@article{osti_1432160,
title = {Microstructure evolution of T91 irradiated in the BOR60 fast reactor},
author = {Jiao, Z. and Taller, S. and Field, K. and Yeli, G. and Moody, M. P. and Was, G. S.},
abstractNote = {In this paper, microstructures of T91 neutron irradiated in the BOR60 reactor at five temperatures between 376 °C and 524 °C to doses between 15.4 and 35.1 dpa were characterized using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and atom probe tomography (APT). Type a<100> dislocation loops were observed at 376–415 °C and network dislocations dominated at 460 °C and 524 °C. Cavities appeared in a bimodal distribution with a high density of small bubbles less than 2 nm at irradiation temperatures between 376 °C and 415 °C. Small bubbles were also observed at 460 °C and 524 °C but cavities greater than 2 nm were absent. Enrichment of Cr, Ni, and Si at the grain boundary was observed at all irradiation temperatures. Radiation-induced segregation (RIS) of Cr, Ni and Si appeared to saturate at 17.1 dpa and 376 °C. The temperature dependence of RIS of Cr, Ni and Si at the grain boundary, which showed a peak Cr enrichment temperature of 460 °C and a lower peak Ni and Si enrichment temperature of ~400 °C, was consistent with observations of RIS of Cr in proton irradiated T91, suggesting that the same RIS mechanism may also apply to BOR60 irradiated T91. G-phase and Cu-rich precipitates were observed at 376–415 °C but were absent at 460 °C and 524 °C. Finally, the absence of G-phase at 524 °C could be related to the minimal segregation of Ni and Si in that condition.},
doi = {10.1016/j.jnucmat.2018.03.024},
journal = {Journal of Nuclear Materials},
number = ,
volume = 504,
place = {United States},
year = {Wed Mar 14 00:00:00 EDT 2018},
month = {Wed Mar 14 00:00:00 EDT 2018}
}

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