| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
|
| Presentation Title |
Solute Segregation Effects at Planar Defects during Creep of CoNi-based Superalloys |
| Author(s) |
Surendra Kumar Makineni, Malte Lenz, Steffen Neumeier, Erdmann Spiecker, Dierk Raabe, Baptiste Gault |
| On-Site Speaker (Planned) |
Baptiste Gault |
| Abstract Scope |
Planar defects such as stacking faults (SF), anti-phase boundaries (APB) and twinning are typical deformation products that originate during creep of a γ/γ'-based superalloys. These are formed during shearing of γ' L12 ordered phase by the moving dislocations. These shearing events are also related to local solute reordering resulting in a selective solute segregation effects to the planar defects.
The present talk will be focused on the detailed 3-dimensional compositional analysis of these planar defects formed in a γ/γ' CoNi-based single-crystal superalloy during creep. Through correlative electron microscopy and atom probe tomography, SFs and APBs were captured along with their associated partial dislocations. These defects exhibit a characteristic chemical-structural contrast. Quantitative analysis of this three-dimensional compositional field in the vicinity of these defects sheds light onto a new in-plane diffusion mechanism as the leading and trailing partials moves on specific {111} planes upon application of stress at high temperature. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |