| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
2023 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-51: Experimental Observation of Heteroepitaxial Recrystallization (HeRX) outside of Low Lattice Misfit Ni-based Superalloys |
| Author(s) |
Yonguk Lee, Eitan Hershokovitz, Honggyu Kim, Eric Payton, Victoria M Miller |
| On-Site Speaker (Planned) |
Yonguk Lee |
| Abstract Scope |
Heteroepitaxial recrystallization (HeRX) is a promising mechanism for grain size control, but has only been reported in Ni-based superalloys with low lattice misfits that have negligible interfacial energy for epitaxial templating. In this study, HeRX is induced in LSHR—a polycrystalline Ni-based superalloy with misfit greater than the conventional limit for HeRX—and scanning TEM and EDS is performed at the γ-γ' interface of grain that had undergone HeRX. Atomic resolution STEM performed along the [112] zone axis reveals strong coherency across the γ-γ’ interface, demonstrating HeRX in an intermediate lattice misfit Ni-based superalloy for the first time. This finding infers that the small lattice misfit is not a strong prerequisite for the onset of HeRX, and therefore, suggests that there is a much wider range than initially believed of processing conditions under which HeRX can be used as a tool for microstructural control in Ni-based superalloys. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Characterization, Other |