| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-45: In Situ Neutron Diffraction Analyses of Dislocation Slip and Twinning Deformation in an Additively Manufactured CrCoNi Medium Entropy Alloy |
| Author(s) |
Wanchuck Woo, Hobyung Chae, Soo Yeol Lee, Stefanus Harjo , Ke An |
| On-Site Speaker (Planned) |
Wanchuck Woo |
| Abstract Scope |
Recently in situ neutron diffraction experiments have been performed in an additively manufactured (AM) equiatomic CoCrNi medium-entropy alloy. Investigated the variations of the dislocation densities and twin fault probabilities under loading based on the faulting-embedded diffraction peak profile analyses. The results show that the initial dislocation density in AM (1.3 x 10^14 m-2) is suprisingly ~10 times higher than the conventional cast-wrought specimen (0.18 x 10^14 m-2). It increases significantly up to 17 x 10^14 m-2 in AM near fracture. On the other hand, the twin fault probability is much lower in AM (1.3%) than cast-wrought specimen (2.7%). It corresponds to the strengthening via dislocation and twinning of 600 and 180 MPa in AM, respectively. Such a dislocation slip dominant deformation mechanism in AM rather than twinning is relavant to the stacking fault energy (SFE). Details peak profile analyses and SFE results will be presented with EBSD and TEM observations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Entropy Alloys, Characterization |