Abstract
An investigation, employing edge-on transmission electron microscopy, of the microstructure of aluminide diffusion coatings on a single crystal y' strengthened nickel base super alloy is reported. An examination has been made of the effect of postcoating exposure at 1100°C on the stability of the coating matrix, a B2 type phase, nominally NiAl. Precipitation in the coating is considered with respect to both decomposition of the B2 matrix to other Ni-Al (plus titanium) phases and the formation of chromium bearing precipitates. A comparison is drawn with behaviour at lower temperatures (850-950°C). © 1995 The Institute of Materials.
| Original language | English |
|---|---|
| Pages (from-to) | 793-798 |
| Number of pages | 6 |
| Journal | Materials Science and Technology |
| Volume | 9 |
| Issue number | 9 |
| Publication status | Published - Sep 1993 |
Keywords
- aluminide coating
- aluminide diffusion coatings
- high-temperature exposure
- matrix
- microstructural degradation
- single crystal nickel based superalloy
- chromium
- crystal microstructure
- diffusion coatings
- single crystals
- superalloys
- titanium
- transmission electron microscopy
- nickel coatings