Abstract
Nb-silicide-based alloys were directionally solidified in yttria moulds. As a result of thermal dissociation of yttria, the alloys were slightly contaminated with oxygen, which caused a competitive oxidation between yttrium and hafnium. The addition of 0.15 at.% yttrium reduced the oxygen increment by 42%, because the buoyant inclusions concentrated around the top surface. The yttrium addition caused a significant purification of the interaction between the yttria mould and the Nb-silicide-based alloys during the directional solidification.
| Original language | English |
|---|---|
| Pages (from-to) | 233-236 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 67 |
| Issue number | 3 |
| DOIs | |
| State | Published - Aug 2012 |
Keywords
- Ceramics
- Directional solidification
- Nb-silicide-based alloy
- Rare earth
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