We report a map of irradiation-induced recrystallization and polygonization in a CrFeCoNiCu high-entropy alloy obtained by a precession electron diffraction technique. This orientation map enables the visualization of depth-dependent recrystallization at a glance and reveals the effects of irradiation dose and material entropy. Discontinuous dynamic recrystallization preferentially occurs near the surface, where the irradiation dose is low, but radiation-enhanced diffusion dominantly occurs leading to dislocation climb even at room temperature. Interestingly, in the high-entropy phase with a relatively low stacking fault energy, discontinuous dynamic recrystallizastion is suppressed due to the lower stored energy and grain boundary diffusivity compared low-entropy one.
Bibliographical noteFunding Information:
The authors appreciate Cheol Hwee Shim and Gi Hoon Park for technical support with PED-OIM and TEM sample preparation using FIB, respectively. This research was supported by the National Nuclear R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT [grant number 2013M2A8A1042255 ] and the KIST Institutional Program [grant number 2V08170 ]. J.Y. Kim and E.S. Park were supported by a National Research Foundation of Korea grant funded by the Korean government (Ministry of Science and ICT) [grant number NRF-2019M3D1A1079215 ] and the Institute of Engineering Research at Seoul National University .
© 2020 Acta Materialia Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys