About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
2026 Graduate Student Poster Contest
|
| Presentation Title |
SPG-19: Investigation of the Local Lattice Orientations on Single Crystal Ni-Based Superalloy Microstructures after Creep Exposure |
| Author(s) |
Elif Dursun, Gunther Eggler, Leonardo Agudo Jácome, Eric Payton |
| On-Site Speaker (Planned) |
Elif Dursun |
| Abstract Scope |
Local misorientations evolve during creep while microstructure evolves. In this study, we used EBSD to study the evolution of local misorientations in the γ/γ´ microstructure of a single crystal after exposures to high temperature, low stress creep. We analyzed fields corresponding to almost 1000 γ´ particles in the initial state and employed a new method that allows for differentiation between diffraction signals from γ and γ´ phase regions. We examined the spatial relationships between locations where misorientation accumulation occurs for dendritic and interdendritic regions for different loading directions. It is observed that intra- and inter-phase misorientations increase as dislocation density increases, then saturates. The dislocation densities were higher in γ channels than in γ´ particles on the micron size. Geometrically necessary misorientations on the microscale are observed to cancel each other out, resulting in undetectable macroscopic change in crystal orientation for accumulated plastic strains of 6%. |