Activation energy for plastic flow in nanocrystalline CoCrFeMnNi high-entropy alloy: A high temperature nanoindentation study
- Authors
- Lee, Dong-Hyun; Choi, In-Chul; Yang, Guanghui; Lu, Zhaoping; Kawasaki, Megumi; Ramamurty, Upadrasta; Schwaiger, Ruth; Jang, Jae-il
- Issue Date
- Nov-2018
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- High-entropy alloy; Nanoindentation; Activation energy barrier; Nanocrystalline metal
- Citation
- SCRIPTA MATERIALIA, v.156, pp.129 - 133
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 156
- Start Page
- 129
- End Page
- 133
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/15949
- DOI
- 10.1016/j.scriptamat.2018.07.014
- ISSN
- 1359-6462
- Abstract
- Nanoindentation experiments in the temperature (7) range of 298 and 573 K were performed to determine the activation energy (Q) for the plastic flow in a nanocrystalline CoCrFeMnNi high-entropy alloy, which was synthesized using high-pressure torsion. A marked increase in Q from similar to 0.5 to similar to 1.8 eV was observed when T is increased from 473 to 523 K, which correspond to similar to 0.3 and similar to 0.34 T-m (T-m: melting temperature), respectively. Detailed analysis reveals that this transition is associated with the additional activation of the grain boundary diffusion mechanism in enhancing plasticity.
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