Nano-scale oxide dispersoids by internal oxidation of Fe–Ti–Y intermetallics

The processing of high-temperature alloys containing nano-scale oxide dispersoids usually involves mechanical alloying, but dispersoid formation by internal oxidation is also an option. In this work, the internal oxidation of the intermetallics Fe 17Y 2 and Fe 11YTi was studied. Internal oxidation r...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-08, Vol.488 (1), p.134-138
Main Authors: Schneibel, J.H., Shim, S.
Format: Article
Language:English
Subjects:
Applied sciences
Dispersion hardening metals
Exact sciences and technology
Hardness
Internal oxidation
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Oxide dispersion strengthening (ODS)
Powder metallurgy. Composite materials
Production techniques
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Summary:The processing of high-temperature alloys containing nano-scale oxide dispersoids usually involves mechanical alloying, but dispersoid formation by internal oxidation is also an option. In this work, the internal oxidation of the intermetallics Fe 17Y 2 and Fe 11YTi was studied. Internal oxidation resulted in small (∼20 nm) oxide particles in an iron solid solution matrix. Oxides such as Y 2O 3, YFeO 3, Y 2Ti 2O 7, and Fe 2TiO 4 were observed. Hardness values as high as those of the original intermetallics were observed. However, the oxide particles coarsened quickly during annealing at 1000 °C. In order to reduce the coarsening rates, oxides more similar to those in mechanically alloyed steels need to be synthesized.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.10.074