|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||TEM Characterization of Tensile Behavior of Advanced Ni-based Single-crystal Superalloys
||Benoit Mansoz, Jonathan Cormier, Pierre Caron, Florence Pettinari-Sturmel
|On-Site Speaker (Planned)
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  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.
||High-Temperature Materials, Mechanical Properties, Characterization