| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recent Advances in Titanium Science and Technology: MPMD/SMD Symposium Honoring Professor Dipankar Banerjee
|
| Presentation Title |
High creep stress exponents and elementary deformation mechanisms |
| Author(s) |
Gunther F. Eggeler |
| On-Site Speaker (Planned) |
Gunther F. Eggeler |
| Abstract Scope |
Creep is one important element of the overall load spectrum which limits the service life of critical high temperature components. The stress dependence of the secondary creep rate of structural materials can be described by a phenomenological power law. It is interesting to compare the creep behavior of structural materials like near-γ titanium aluminides, tempered martensite ferritic steels, short fiber reinforced metal matrix composites and Ni-base single crystal superalloys, which all exhibit Norton law stress exponents close to n=10. Dislocation processes govern their creep behavior. In spite of this commonalty of microscopic and macroscopic phenomena, there is a distinct difference in elementary dislocation mechanisms. The creep mechanisms of the four material classes are not the same. Results from earlier work are discussed in the light of novel results on single crystal Ni-base superalloys, with emphasis placed on the coupling of macroscopic mechanical behavior and microstructural evolution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Characterization |