| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
In situ Neutron Diffraction Study on L12-Precipitation-Strengthened (FeCoNi)86Al7Ti7 High Entropy Alloy |
| Author(s) |
Lia Amalia, Zongyang Lyu, Peter Liaw, Yanfei Gao |
| On-Site Speaker (Planned) |
Lia Amalia |
| Abstract Scope |
Deformation mechanisms of nano-precipitation-strengthened high entropy alloys (HEAs) have been investigated mostly by post-mortem or interrupted characterizations, but a quantitative and real-time understanding is still lacking. Here, in situ neutron diffraction tests were performed during the tensile test of (FeCoNi)86Al7Ti7 alloy with L12 precipitates (size of ~100-200 nm), demonstrating an ultimate tensile strength of ~ 1.2 GPa and a fracture strain of ~ 38.5%. In situ study revealed multistage deformation work hardening behavior of both matrix and L12 precipitates Beyond the classic load sharing between two phases, we develop a micromechanical model that can extract the phase-specific, working hardening rate from lattice strain evolutions. It is found that the excess dislocation hardening in the soft matrix at later stage is the key in delaying the necking initiation and thus improving the ductility. This synergistic study provides a new perspective on the design of precipitation-strengthened HEAs. |
| Proceedings Inclusion? |
Planned: |