Abstract
Short cracks, extending to the interdiffusion zone, have been observed in platinum-modified nickel-aluminide diffusion coatings on single-crystal CMSX-4 superalloys after these have been subject to short (10 min) rapid thermal cycles. The cracks were revealed after removing the thermally grown oxide formed during cycling on the coating surfaces. Cracking was observed for coatings subject to thermal cycling between 1150 and 1050 °C, with and without an applied compressive stress, as well as on thermal cycling between 1150 °C and room temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 917-920 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 60 |
| Issue number | 10 |
| DOIs | |
| State | Published - May 2009 |
| Externally published | Yes |
Funding
This work was supported by the Office of Naval Research under contract A00014-04-1-0053. The authors are grateful to Dr. Ken Murphy, Howmet Research Corporation for supplying the materials studied in this work, and to John Day for his microscopy assistance. We also appreciate the comments of the reviewer, including bringing the work in Ref. [12] to our attention.
| Funders | Funder number |
|---|---|
| Office of Naval Research | A00014-04-1-0053 |
Keywords
- Aluminide coating
- Compressive stress
- Cyclic oxidation testing
- Grain structure
- Rumpling