Morphology, Structure, and Chemistry of Nanoclusters in a Mechanically-Alloyed Nanostructured Ferritic Steel

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-012-6249-x· OSTI ID:1039582

Brandes, Matthew C ^[1]; Kovarik, L. ^[1]; Miller, Michael K ^[2]; Mills, Michael J. ^[1]

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1. Ohio State University
2. ORNL

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 {approx}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 {l_brace}100{r_brace} and {l_brace}110{r_brace} 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1039582
• Journal Information: Journal of Materials Science, Vol. 47, Issue 8; ISSN 0022-2461
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
CHEMISTRY
CREEP
CRYSTAL STRUCTURE
DIMENSIONS
FERRITIC STEELS
MORPHOLOGY
OXIDES
PROBES
RADIATIONS
THICKNESS
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY