Abstract
Nanostructured ferritic steels have excellent elevated temperature strengths, creep resistances, and radiation tolerances due to the presence of a high density of Ti–Y–O-enriched nanoclusters. The compositions, morphologies, and structures of the smallest of these nanoclusters with maximum dimensions of ~2–4 nm were investigated in alloy 14YWT by high-resolution scanning transmission electron microscopy and atom probe tomography. Nanoclusters are found to be coherent with truncated rhombic dodecahedron morphologies defined by the {100} and {110} planes in the Fe matrix. Particles have compositions rich in Ti, O, Y, and Cr that are inconsistent with known oxide structures. The smallest nanoclusters appear to lack an identifiable crystal structure. Both nano-diffraction and focal series imaging through the sample thickness suggest that they are amorphous.
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Acknowledgements
The authors thank Dr. D.T. Hoelzer for supplying the material used in this study, Dr. Joachim Schneibel for provision of deformed compression specimens, and Professor H.L. Fraser for access to the Fischione 1040 Nanomill®. Additionally, the authors thank Mr. Mike Kuper for his efforts pertaining to data and image management. This research was sponsored by the US Department of Energy, Materials Sciences and Engineering Division, Office of Basic Energy Sciences under Contract No. DE-AC05-00OR22725. Research at the Oak Ridge National Laboratory SHaRE User Facility was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy.
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Brandes, M.C., Kovarik, L., Miller, M.K. et al. Morphology, structure, and chemistry of nanoclusters in a mechanically alloyed nanostructured ferritic steel. J Mater Sci 47, 3913–3923 (2012). https://doi.org/10.1007/s10853-012-6249-x
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DOI: https://doi.org/10.1007/s10853-012-6249-x