Suppressed radiation-induced dynamic recrystallization in CrFeCoNiCu high-entropy alloy

SCRIPTA MATERIALIA

卷:190

Article

Kim, Jinyeon^1,2  Lim, Jong Wook^1,3  Kim, Joon Kon¹  Kim, Do Hyang³  Park, Eun Soo²  Chang, Hye Jung^1,4 

[1] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 02792, South Korea

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[3] Yonsei Univ, Ctr Noncrystalline Mat, Seoul 03722, South Korea

[4] Univ Sci & Technol, KIST Sch, Div Nano & Informat Technol, Seoul 02792, South Korea

关键词: High-entropy alloy;    Irradiation damage;    Discontinuous dynamic recrystallization;    Transmission electron microscopy;    Precession electron diffraction;   

DOI  :  10.1016/j.scriptamat.2020.08.045

来源: Elsevier

【 摘 要 】

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. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free