About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys VIII
|
Presentation Title |
J-83: Deformation-induced Short-range Ordering and Its Impact on Cryogenic Deformation in Boron-doped High-Entropy Alloys |
Author(s) |
Jae Bok Seol, Jae Wung Bae, Zhiming Li, Won-Seok Ko, Hyoung Seop Kim |
On-Site Speaker (Planned) |
Jae Bok Seol |
Abstract Scope |
We report a strategy for improving the cryogenic strength of FCC-structured HEAs through short-range order (SRO), which is driven by soluble boron at the high-entropy grain interiors, not by interfacial boron. Introducing soluble boron into the FCC matrices provided the key benefits, i.e., creation of SROs and increase in SRO degree during cryogenic-temperature deformation, as proved by TEM diffraction and synchrotron XRD. With this new approach, we increased the cryogenic yield strengths of non-equiatomic Fe40Mn40Co10Cr10 (at %) and near-equiatomic NiFeMnCoCr alloys by ~32% to ~1.1 GPa compared to those of boron-free reference materials with similar grain sizes. We will provide experimental proofs on the advent of such deformation-induced SROs on planar dislocation band structures, which can be successfully visualized by common dark-field TEM conditions. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |