Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation
Abstract
Cr diffusion in trilayer thin films of 100 nm Fe–18Cr/125 nm TiO2–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/TiO2–x interface itself, was observed under both annealing and irradiation. Cr diffusion into TiO2–x was enhanced in ion-irradiated samples as compared to annealed. Irradiation-induced voids and amorphization of TiO2–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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1248639
- Alternate Identifier(s):
- OSTI ID: 1255334
- Report Number(s):
- LA-UR-15-20777
Journal ID: ISSN 1359-6454; PII: S1359645415000841
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 89; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; radiation-induced solute redistribution (RISR); metal/oxide interface; density functional theory (DFT)
Citation Formats
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., and Li, N. Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation. United States: N. p., 2015.
Web. doi:10.1016/j.actamat.2015.01.071.
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. Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation. United States. https://doi.org/10.1016/j.actamat.2015.01.071
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., and Li, N. Thu .
"Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation". United States. https://doi.org/10.1016/j.actamat.2015.01.071. https://www.osti.gov/servlets/purl/1248639.
@article{osti_1248639,
title = {Solute redistribution and phase stability at FeCr/TiO2–x interfaces under ion irradiation},
author = {Xu, Y. and Aguiar, J. A. and Yadav, S. K. and Anderoglu, O. and Baldwin, J. K. and Wang, Y. Q. and Valdez, James A. and Misra, A. and Luo, H. M. and Uberuaga, B. P. and Li, N.},
abstractNote = {Cr diffusion in trilayer thin films of 100 nm Fe–18Cr/125 nm TiO2–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/TiO2–x interface itself, was observed under both annealing and irradiation. Cr diffusion into TiO2–x was enhanced in ion-irradiated samples as compared to annealed. Irradiation-induced voids and amorphization of TiO2–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.},
doi = {10.1016/j.actamat.2015.01.071},
journal = {Acta Materialia},
number = C,
volume = 89,
place = {United States},
year = {Thu Feb 26 00:00:00 EST 2015},
month = {Thu Feb 26 00:00:00 EST 2015}
}
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