Abstract
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.
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