Abstract
A comparative study on microstructure, composition variation and phase distribution in an Ir-aluminide and an aluminized Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation test at 1373 K is reported. The weight change as a function of number of oxidation cycles has demonstrated an improved oxidation resistance for iridium aluminide. While aluminized TMS-75 has an enrichment of aluminium to approximately 50 at.%, an addition of iridium increases the average aluminium concentration of the surface to approximately 70 at.% in the as aluminized condition. Unlike the aluminized TMS-75, the cyclic oxidized Ir aluminide reveals a precipitate free surface layer, followed by a significantly reduced precipitation of γ′-Ni3Al and TCP phases in the diffusion zone.
| Original language | English |
|---|---|
| Pages (from-to) | 377-388 |
| Number of pages | 12 |
| Journal | Surface and Coatings Technology |
| Volume | 186 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2004 Sep 1 |
| Externally published | Yes |
Keywords
- Diffusion
- Iridium
- Ni-base superalloy
- Oxidation
- Sputtering
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry