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HRTEM Study of Irradiation-Induced Cavities in Oxide-Dispersed Ferritic Steel

  • Symposium: Solid-State Interfaces II: Toward an Atomistic-Scale Understanding of Structure, Properties, and Behavior through Theory and Experiment
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Abstract

Structures of oxide nanoparticles and the effects of matrix/nanoparticle interfaces on irradiation-induced cavity nucleation and distribution in Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y2O3 oxide-dispersed ferritic steel have been studied using high-resolution transmission electron microscopy techniques. The frequent observations of partially crystallized complex-oxide nanoparticles in as-fabricated steel provide an implication into the formation mechanism of nanoparticles. The mechanism involves the solid-state mixing of pre-alloyed metallic powder and Y2O3 powder to form an amorphous solid solution and from which the nucleation of high density complex-oxide nanoparticles (on the order of ~1 × 1022 m−3). Simultaneous dual ion beams consisting of iron and helium were employed to irradiate the oxide-dispersed steel at 698 K (425 °C). The result shows that the defective oxide nanoparticles have a positive effect on the mitigation of dimensional swelling as a result of the preferred nucleation of helium-filled cavities at the matrix/nanoparticle interfaces.

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Acknowledgments

This work was performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Work at the LLNL was funded by the Laboratory Directed Research and Development Program at the LLNL under Project tracking code 12-SI-002. The author gratefully acknowledges Professor Akihiko Kimura of Kyoto University for fabricating and providing the ODS steel for this study, Drs. Michael Fluss, Bill Choi, and Scott Tumey for carrying out the ion beam experiment at Saclay, France, and Mark Wall for TEM particle size distribution analyses. The author would also like to thank N.E. Teslich and R.J. Gross for TEM sample preparations.

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  1. Condensed Matter and Materials Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA

    Luke L. Hsiung (Staff Scientist)

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  1. Luke L. Hsiung
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Correspondence to Luke L. Hsiung.

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Manuscript submitted August 30, 2012.

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Hsiung, L.L. HRTEM Study of Irradiation-Induced Cavities in Oxide-Dispersed Ferritic Steel. Metall Mater Trans A 44, 4496–4504 (2013). https://doi.org/10.1007/s11661-013-1906-5

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  • DOI: https://doi.org/10.1007/s11661-013-1906-5

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