| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Microstructure and Mechanical Properties of Cu-Al2O3 Composites for Elevated Temperatures Applications |
| Author(s) |
Ramasis Goswami, Alex Moser |
| On-Site Speaker (Planned) |
Ramasis Goswami |
| Abstract Scope |
Copper alloys are useful candidates for elevated temperatures and high heat-flux (100 MW m2) applications, where a high thermal conductivity, elevated temperature strength, resistance to creep, and low cycle fatigue are needed. We report here a cold worked Cu-Al2O3 composite did not recrystallize up to a temperature of 0.83Tm of Cu. The composite was manufactured through the internal oxidation process and characterized by transmission electron microscopy to study the nature of oxide precipitates. As a result of internal oxidation, a small volume fraction (1 %) of Al2O3 particles forms. In addition, a high density of extremely fine (2-5 nm) Cu2O particles has been observed to be formed epitaxially within the elongated Cu grains. These finely dispersed second phase Cu2O particles enhance the Zener drag significantly by three order of magnitude as compared to Al2O3 particles, and limit the grain boundary migration and inhibit the recrystallization process at elevated temperatures. |
| Proceedings Inclusion? |
Planned: |