About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
Energy Materials 2026
|
| Presentation Title |
Study on the Modulation of Grain Boundary Precipitates and the Interface Characteristics of Precipitation in Ni-base Alloys |
| Author(s) |
Peng Yang, Chen Yang, Xiayan Cai, Wenqiang Sun, Longfei Wang, Junjie Wu, Cheng Su |
| On-Site Speaker (Planned) |
Peng Yang |
| Abstract Scope |
The development of high-efficiency power generation technologies requires that core components possess superior creep resistance at elevated temperatures. The precipitates of grain boundaries and TiC inclusions have significant effects on the high-temperature creep resistance. This study investigates grain boundary precipitates in Ni-based alloys through compositional control and varied heat treatments, with their composition, morphology, and structure characterized by scanning/transmission electron microscopy. Alloy-(Cr=16%, Ti=1%) contains four types of precipitates at the grain boundaries: Cr-rich M₂₃C₆, Ni-rich B2-Ni-Al phase, Mo-rich M₆C phase, and Ti-rich MC phase. The grain boundary precipitates in Alloy-(Cr=14%, Ti=3%) consist of M₂₃C₆ and B2-NiAl phases. The first-principles calculations reveal the M₂₃C₆/matrix interface exhibits covalent-metallic bonding with diffuse charge distribution, whereas the TiC/matrix interface shows strong ionic bonding with localized charge transfer, inhibiting coarsening. |
| Proceedings Inclusion? |
Undecided |
