title: Cr incorporated phase transformation in Y2O3under ion irradiation.
abstract: Under irradiation, chemical species can redistribute in ways not expected from equilibrium behavior. In oxide-dispersed ferritic alloys, the phenomenon of irradiation-induced Cr redistribution at the metal/oxide interfaces has drawn recent attention. Here, the thermal and irradiation stability of the FeCr/Y2O3interface has been systematically studied. Trilayer thin films of 90 nm Fe - 20 at.% Cr (1stlayer)/100 nm Y2O3(2ndlayer)/135 nm Fe - 20 at.% Cr (3rdlayer) were deposited on MgO substrates at 500 °C. After irradiation, Cr diffuses towards and enriches the FeCr/Y2O3interface. Further, correlated with Cr redistributed into the oxide, an amorphous layer is generated at the interface. In the Y2O3layer, the original cubic phase is observed to transform to the monoclinic phase after irradiation. Meanwhile, nanosized voids, with relatively larger size at interfaces, are also observed in the oxide layer. First-principles calculations reveal that Cr substitution of Y interstitials in Y2O3containing excess Y interstitials is favored and the irradiation-induced monoclinic phase enhances this process. Our findings provide new insights that may aid in the development of irradiation resistant oxide-dispersed ferritic alloys.
authors.affiliation: Materials Physics and Applications Division, MPA-CINT, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: N
authors.initials: N
authors.lastname: Li
authors.affiliation: Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Yadav
authors.affiliation: Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Idaho National Laboratory, Idaho Falls, Idaho, 83415, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Aguiar
authors.affiliation: Materials Physics and Applications Division, MPA-CINT, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J K
authors.initials: JK
authors.lastname: Baldwin
authors.affiliation: Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Wang
authors.affiliation: Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA.
authors.forename: H M
authors.initials: HM
authors.lastname: Luo
authors.affiliation: Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: A
authors.initials: A
authors.lastname: Misra
authors.affiliation: Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: B P
authors.initials: BP
authors.lastname: Uberuaga