About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Energy Technology 2026: Advancement in Energy Materials - Theory, Simulation, Characterization, Application
|
| Presentation Title |
Dynamic strain ageing of L12-strengthened Ni-Co base high-entropy alloy and unraveling its deformation mechanisms in strain ageing process |
| Author(s) |
Jinxiong Hou |
| On-Site Speaker (Planned) |
Jinxiong Hou |
| Abstract Scope |
Dynamic strain ageing (DSA) of L12-strengthened Ni-Co base high-entropy alloy (HEA) was examined at temperatures varying from 20 to 600 ℃ with strain rates between 10-2 to 10-4 s-1. In normal DSA regimes, elevating temperature or lowering strain rate advances the DSA behavior, resulting in the lowered critical strain and raised amplitude of serrations. Based on strain-rate jump tests, the negative strain-rate sensitivity induced by DSA was observed at the elevated temperature regime, and high apparent activation volumes ranging from 97 ~ 737b^3 correspond to the strong obstacles effect from the precipitates and the additional pinning strengthening of solute atoms. A two-time parameter-based Cottrell-Bilby strain aging kinetic model that considers the solute-dislocation interaction in a pipe diffusion manner is applied to evaluate the DSA strengthening concerning strain, strain rate, and temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, High-Entropy Alloys |