Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation

Xu, Y.; Aguiar, J. A.; Yadav, S. K.; Anderoglu, O.; Baldwin, J. K.; Wang, Y. Q.; Valdez, James A.; Misra, A.; Luo, H. M.; Uberuaga, B. P.; Li, N.

doi:10.1016/j.actamat.2015.01.071

Title: Solute redistribution and phase stability at FeCr/TiO_2–x interfaces under ion irradiation

Journal Article · Thu Feb 26 00:00:00 EST 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.01.071· OSTI ID:1248639

Xu, Y. ^[1]; Aguiar, J. A. ^[2]; Yadav, S. K. ^[2]; Anderoglu, O. ^[2]; Baldwin, J. K. ^[2]; Wang, Y. Q. ^[2]; Valdez, James A. ^[2]; Misra, A. ^[2]; Luo, H. M. ^[3]; Uberuaga, B. P. ^[2]; Li, N. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico State Univ., Las Cruces, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
New Mexico State Univ., Las Cruces, NM (United States)

Cr diffusion in trilayer thin films of 100 nm Fe–18Cr/125 nm TiO_2–x/100 nm Fe–18Cr deposited on MgO substrates at 500 °C was studied by either annealing at 500 °C or Ni³⁺ ion irradiation at 500 °C. Microchemistry and microstructure evolution at the metal/oxide interfaces were investigated using (high-resolution) transmission electron microscopy, energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy. Diffusion of Cr into the O-deficient TiO₂ layer, with negligible segregation to the FeCr/TiO_2–x interface itself, was observed under both annealing and irradiation. Cr diffusion into TiO_2–x was enhanced in ion-irradiated samples as compared to annealed. Irradiation-induced voids and amorphization of TiO_2–x was also observed. The experimental results are rationalized using first-principles calculations that suggest an energetic preference for substituting Ti with Cr in sub-stoichiometric TiO₂. Furthermore, the implications of these results on the irradiation stability of oxide-dispersed ferritic alloys are discussed.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1248639

Alternate ID(s):: OSTI ID: 1255334

Report Number(s):: LA-UR-15-20777; PII: S1359645415000841

Journal Information:: Acta Materialia, Vol. 89, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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