Abstract
It is difficult to deposit dense intermetallic compound coatings by cold spraying directly using the compound feedstock powders due to their intrinsic low-temperature brittleness. A method to prepare intermetallic compound coatings in-situ employing cold spraying was developed using a metastable alloy powder assisted with post-heat treatment. In this study, a nanostructured Fe/Al alloy powder was prepared by ball-milling process. The cold-sprayed Fe/Al alloy coating was evolved in-situ to intermetallic compound coating through a post-heat treatment. The microstructural evolution of the Fe-40A1 powder during mechanical alloying and the effect of the post-heat treatment on the microstructure of the coldsprayed Fe(Al) coating were characterized by optical microscopy, scanning electron microscopy, transmission electron microscopy (TEM), and x-ray diffraction analysis. The results showed that the milled Fe-40Al powder exhibits lamellar microstructure. The microstructure of the as-sprayed Fe(Al) coating depends significantly on that of the as-milled powder. The heat-treatment temperature significantly influences the in-situ evolution of the intermetallic compound. The heat treatment at a temperature of 500 °C results in the complete transformation of Fe(Al) solid solution to FeAl intermetallic compound.
| Original language | English |
|---|---|
| Pages | 669-676 |
| Number of pages | 8 |
| State | Published - 2007 |
| Externally published | Yes |
| Event | 2007 International Thermal Spray Conference on Thermal Spray 2007: Global Coating Solutions - Beijing, China Duration: 14 May 2007 → 16 May 2007 |
Conference
| Conference | 2007 International Thermal Spray Conference on Thermal Spray 2007: Global Coating Solutions |
|---|---|
| Country/Territory | China |
| City | Beijing |
| Period | 14/05/07 → 16/05/07 |
Keywords
- Ball milling
- Cold spray
- Feal
- Heat treatment
- Microstructure
- Nanocrystalline material