Irradiation-induced amorphization of Fe-Y-based second phase particles in accident-tolerant FeCrAl alloys

Keyou S. Mao, Caleb P. Massey, Maxim N. Gussev, Yukinori Yamamoto, Andrew T. Nelson, Kevin G. Field, Philip D. Edmondson

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Second phase intermetallic particles in an advanced accident-tolerant FeCrAl (Fe-13Cr-5Al-2Mo) alloy are formed in the α-Fe matrix during processing. These particles are prominently related to the added Y. Neutron irradiation to ~7 displacements per atom (dpa) with a dose rate of ~8.16 × 10−7 dpa/s at 282 °C resulted in the amorphization of these precipitates which could degrade the mechanical properties of the FeCrAl alloys. Analytical electron microscopy and diffraction analysis combined with structural freedom analysis have been used to investigate the radiation resistance of the second phase particles. Radiation tolerance is closely linked to the particle Fe-Y content and can be tailored using the structure freedom value.

Original languageEnglish
Article number101016
JournalMaterialia
Volume15
DOIs
StatePublished - Mar 2021

Funding

This research was performed, in part, using instrumentation (FEI Talos) provided by the Department of Energy (DOE), Office of Nuclear Energy, Fuel Cycle R&D Program, and the Nuclear Science User Facilities. Research was sponsored by the DOE Office of Nuclear Energy, Advanced Fuel Campaign of the Nuclear Technology R&D program. Neutron irradiation of FeCrAl alloys at ORNL's HFIR user facility was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. Authors would like to thank Dr. J.M. Harp (ORNL) and Dr. C.M. Parish (ORNL) for discussing the results, providing fruitful comments, and reviewing the paper; staff of the Irradiated Materials Examination and Testing facility and LAMDA (Low Activation Materials Design and Analysis Laboratory) for their continuing support. This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05–00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

  • Amorphization
  • FeCrAl
  • Ferritic steels
  • Multivariate statistics applications
  • Neutron irradiation

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