Post irradiation examination of nanoprecipitate stability and α′ precipitation in an oxide dispersion strengthened Fe-12Cr-5Al alloy. (15th March 2019)

• Record Type: Journal Article
• Authors: Massey, Caleb P.; Edmondson, Philip D.; Field, Kevin G.; Hoelzer, David T.; Dryepondt, Sebastien N.; Terrani, Kurt A.; Zinkle, Steven J.
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 94
• Page End: 98
• Publication Date: 2019-03-15
• Subjects: Atom probe tomography -- Oxide dispersion strengthened (ODS) alloy -- Precipitation -- Neutron irradiation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.10.047
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Unlabelled Image