About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
High-Entropy Materials: Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond VI
|
| Presentation Title |
The role of precipitate size in cryogenic deformation mechanisms and mechanical properties of the L12-strengthened ferrous alloy |
| Author(s) |
Gwanghyeon Moon, Jinkyung Kim |
| On-Site Speaker (Planned) |
Gwanghyeon Moon |
| Abstract Scope |
We investigated the role of precipitate size in cryogenic deformation mechanisms and mechanical properties of the L12-strengthened Fe45.2Ni30.1Cr17.9Al3.5Ti3.2 (at. %) alloy. The hot-rolled sample was homogenized at 1000 °C, followed by annealing at 700 °C (A700) and 900 °C (A900) to form L12 precipitates of different sizes. Tensile tests at 123 K showed higher strength and larger ductility in the A700 sample than the A900 sample. In regions with smaller precipitates (grain interior and fine discontinuous precipitation zone in the A700 sample), slip bands were formed at the early stage of deformation. At higher strains, microbands and deformation twins were formed within grains, while dense microbands were developed in fine discontinuous precipitation zones. In contrast, the A900 sample with larger precipitates and coarse discontinuous precipitation zones in the A700 sample exhibited dislocation-precipitate interactions, leading to dislocation entanglement at higher strains. We discuss the relationship between deformation mechanisms and mechanical properties. |