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Title: Role of refractory inclusions in the radiation-induced microstructure of APMT

Kanthal APMT is a promising FeCrAl-based alloy for accident-tolerant fuel cladding because of its excellent high-temperature oxidation resistance. In this study, powder metallurgy Kanthal APMT alloy, neutron irradiated to 1.8 dpa at nominally 382 °C, was characterized. On-zone STEM imaging revealed that radiation-induced dislocation loops with Burgers vectors of a/2 <111 > or and black dots tended to agglomerate in the vicinity of refractory inclusions. The densities and sizes of these loops decreased with distance from the inclusion-matrix interfaces. In addition, high-resolution energy-dispersive X-ray spectroscopy mapping was used to determine the inclusions to be either yttrium- or silicon-rich, as well as to detect the radial distribution of radiation-enhanced α' phase near these inclusions. A high density of randomly distributed Cr-rich α' phase was found, regardless of the presence of inclusions. Here, the results from this study provide insights into how microstructural features can locally tailor the radiation-induced defects in FeCrAl-based alloys.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2018-7546J
Journal ID: ISSN 0022-3115
Grant/Contract Number:
AC05-00OR22725; AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 505; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FeCrAl; Accident tolerant; Dislocation loops; Precipitation
OSTI Identifier:
1464010
Alternate Identifier(s):
OSTI ID: 1464191

Zhang, Dalong, Briggs, Samuel A., and Field, Kevin G.. Role of refractory inclusions in the radiation-induced microstructure of APMT. United States: N. p., Web. doi:10.1016/j.jnucmat.2018.04.017.
Zhang, Dalong, Briggs, Samuel A., & Field, Kevin G.. Role of refractory inclusions in the radiation-induced microstructure of APMT. United States. doi:10.1016/j.jnucmat.2018.04.017.
Zhang, Dalong, Briggs, Samuel A., and Field, Kevin G.. 2018. "Role of refractory inclusions in the radiation-induced microstructure of APMT". United States. doi:10.1016/j.jnucmat.2018.04.017. https://www.osti.gov/servlets/purl/1464010.
@article{osti_1464010,
title = {Role of refractory inclusions in the radiation-induced microstructure of APMT},
author = {Zhang, Dalong and Briggs, Samuel A. and Field, Kevin G.},
abstractNote = {Kanthal APMT is a promising FeCrAl-based alloy for accident-tolerant fuel cladding because of its excellent high-temperature oxidation resistance. In this study, powder metallurgy Kanthal APMT alloy, neutron irradiated to 1.8 dpa at nominally 382 °C, was characterized. On-zone STEM imaging revealed that radiation-induced dislocation loops with Burgers vectors of a/2 <111 > or and black dots tended to agglomerate in the vicinity of refractory inclusions. The densities and sizes of these loops decreased with distance from the inclusion-matrix interfaces. In addition, high-resolution energy-dispersive X-ray spectroscopy mapping was used to determine the inclusions to be either yttrium- or silicon-rich, as well as to detect the radial distribution of radiation-enhanced α' phase near these inclusions. A high density of randomly distributed Cr-rich α' phase was found, regardless of the presence of inclusions. Here, the results from this study provide insights into how microstructural features can locally tailor the radiation-induced defects in FeCrAl-based alloys.},
doi = {10.1016/j.jnucmat.2018.04.017},
journal = {Journal of Nuclear Materials},
number = C,
volume = 505,
place = {United States},
year = {2018},
month = {4}
}