Post irradiation examination of nanoprecipitate stability and α′ precipitation in an oxide dispersion strengthened Fe-12Cr-5Al alloy

Caleb P. Massey; Philip D. Edmondson; Kevin G. Field; David T. Hoelzer; Sebastien N. Dryepondt; Kurt A. Terrani; Steven J. Zinkle

doi:10.1016/j.scriptamat.2018.10.047

Post irradiation examination of nanoprecipitate stability and α^′ precipitation in an oxide dispersion strengthened Fe-12Cr-5Al alloy

Caleb P. Massey, Philip D. Edmondson, Kevin G. Field, David T. Hoelzer, Sebastien N. Dryepondt, Kurt A. Terrani, Steven J. Zinkle

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Oxide dispersion strengthened (ODS) FeCrAl alloy (Fe-12Cr-5Al wt%) was neutron irradiated to 1.8 displacements per atom (dpa) at 215, 357, and 557 °C to investigate (Y,Al,O) nano-oxide stability and Cr-rich α^′ precipitate formation using atom probe tomography. The nano-oxide sizes remain unchanged after irradiation, but the compositions are dependent on irradiation temperature due to competition between ballistic dissolution and precipitate reformation. Cr-rich clusters observed after 357 °C irradiation have lower Cr contents (61 at.%) than equilibrium α^′, with a lower number density than wrought FeCrAl alloys. This suggests a suppression of α^′ precipitation due to the high sink strength of ODS FeCrAl.

Original language	English
Pages (from-to)	94-98
Number of pages	5
Journal	Scripta Materialia
Volume	162
DOIs	https://doi.org/10.1016/j.scriptamat.2018.10.047
State	Published - Mar 15 2019

Funding

Primary characterization efforts were funded by a Nuclear Science User Facilities Rapid Turnaround Experiment (17-961) and were conducted at the Center for Advanced Energy Studies-Microscopy and Characterization Suite (CAES-MaCS) with the help of Jatuporn Burns and Dr. Yaqiao Wu. A portion of the irradiation campaign, including capsule design, capsule opening, radioactive specimen handling/preparation, and data analysis, was sponsored by the DOE-NE, Advanced Fuel Campaign of the Nuclear Technology Research and Development programs. Neutron irradiation of the 125YF specimens at ORNL's HFIR user facility was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. The authors would like to thank Jatuporn Burns and Dr. Yaqiao Wu for their assistance with instrument operation at the MaCS facility and the Irradiated Materials Examination and Testing facility and LAMDA laboratory staff for their continuing support of this research. This material is based upon work supported under a Department of Energy Nuclear Energy University Programs (NEUP) Graduate Fellowship.

Keywords

Atom probe tomography
Neutron irradiation
Oxide dispersion strengthened (ODS) alloy
Precipitation

Access to Document

10.1016/j.scriptamat.2018.10.047

Cite this

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title = "Post irradiation examination of nanoprecipitate stability and α′ precipitation in an oxide dispersion strengthened Fe-12Cr-5Al alloy",

abstract = "Oxide dispersion strengthened (ODS) FeCrAl alloy (Fe-12Cr-5Al wt%) was neutron irradiated to 1.8 displacements per atom (dpa) at 215, 357, and 557 °C to investigate (Y,Al,O) nano-oxide stability and Cr-rich α′ precipitate formation using atom probe tomography. The nano-oxide sizes remain unchanged after irradiation, but the compositions are dependent on irradiation temperature due to competition between ballistic dissolution and precipitate reformation. Cr-rich clusters observed after 357 °C irradiation have lower Cr contents (61 at.%) than equilibrium α′, with a lower number density than wrought FeCrAl alloys. This suggests a suppression of α′ precipitation due to the high sink strength of ODS FeCrAl.",

keywords = "Atom probe tomography, Neutron irradiation, Oxide dispersion strengthened (ODS) alloy, Precipitation",

author = "Massey, {Caleb P.} and Edmondson, {Philip D.} and Field, {Kevin G.} and Hoelzer, {David T.} and Dryepondt, {Sebastien N.} and Terrani, {Kurt A.} and Zinkle, {Steven J.}",

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doi = "10.1016/j.scriptamat.2018.10.047",

language = "English",

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T1 - Post irradiation examination of nanoprecipitate stability and α′ precipitation in an oxide dispersion strengthened Fe-12Cr-5Al alloy

AU - Massey, Caleb P.

AU - Edmondson, Philip D.

AU - Field, Kevin G.

AU - Hoelzer, David T.

AU - Dryepondt, Sebastien N.

AU - Terrani, Kurt A.

AU - Zinkle, Steven J.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Oxide dispersion strengthened (ODS) FeCrAl alloy (Fe-12Cr-5Al wt%) was neutron irradiated to 1.8 displacements per atom (dpa) at 215, 357, and 557 °C to investigate (Y,Al,O) nano-oxide stability and Cr-rich α′ precipitate formation using atom probe tomography. The nano-oxide sizes remain unchanged after irradiation, but the compositions are dependent on irradiation temperature due to competition between ballistic dissolution and precipitate reformation. Cr-rich clusters observed after 357 °C irradiation have lower Cr contents (61 at.%) than equilibrium α′, with a lower number density than wrought FeCrAl alloys. This suggests a suppression of α′ precipitation due to the high sink strength of ODS FeCrAl.

AB - Oxide dispersion strengthened (ODS) FeCrAl alloy (Fe-12Cr-5Al wt%) was neutron irradiated to 1.8 displacements per atom (dpa) at 215, 357, and 557 °C to investigate (Y,Al,O) nano-oxide stability and Cr-rich α′ precipitate formation using atom probe tomography. The nano-oxide sizes remain unchanged after irradiation, but the compositions are dependent on irradiation temperature due to competition between ballistic dissolution and precipitate reformation. Cr-rich clusters observed after 357 °C irradiation have lower Cr contents (61 at.%) than equilibrium α′, with a lower number density than wrought FeCrAl alloys. This suggests a suppression of α′ precipitation due to the high sink strength of ODS FeCrAl.

KW - Atom probe tomography

KW - Neutron irradiation

KW - Oxide dispersion strengthened (ODS) alloy

KW - Precipitation

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