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

SCRIPTA MATERIALIA

卷:162

Article

Massey, Caleb P.¹  Edmondson, Philip D.²  Field, Kevin G.²  Hoelzer, David T.²  Dryepondt, Sebastien N.²  Terrani, Kurt A.²  Zinkle, Steven J.^1,2 

[1] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

关键词: Atom probe tomography;    Oxide dispersion strengthened (ODS) alloy;    Precipitation;    Neutron irradiation;   

DOI  :  10.1016/j.scriptamat.2018.10.047

来源: Elsevier

【 摘 要 】

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 degrees C to investigate (Y,Al,O) nano-oxide stability and Cr-rich alpha' 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 degrees C irradiation have lower Cr contents (61 at.%) than equilibrium alpha', with a lower number density than wrought FeCrAl alloys. This suggests a suppression of alpha' precipitation due to the high sink strength of ODS FeCrAl. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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