| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
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Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
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| Presentation Title |
TEM Characterization of Tensile Behavior of Advanced Ni-based Single-crystal Superalloys |
| Author(s) |
Benoit Mansoz, Jonathan Cormier, Pierre Caron, Florence Pettinari-Sturmel |
| On-Site Speaker (Planned) |
Benoit Mansoz |
| Abstract Scope |
TMS-238 is a promising 6th generation superalloy with impressive high temperature creep performance but it exhibits a particular tensile behavior at 650°C with low yield strength, low ductility and non-classical hardening. To study this behavior, TMS-238 specimens with different misorientations away from the perfect [001] orientation were tensile tested at 650°C. TEM investigations were conducted with post mortem observations and in situ TEM tensile tests at 650°C. Similar TEM experiments were also performed using other alloys for reference. Mechanical tests revealed that highly misoriented specimens do not exhibit this atypical hardening behavior but keep a similar low yield strength. TEM investigations revealed a high density of dislocations and stacking faults in the γ phase. EDX analysis confirmed significant amounts of Re and Ru in γ, two elements known to decrease misfit and fault energy, resulting in a lower mobility of dislocations in the matrix and a strong hardening. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Characterization |