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Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy
- Authors
- Zhao, Yakai; Wang, Xutao; Cao, Tangqing; Han, Jae-Kyung; Kawasaki, Megumi; Jang, Jae-il; Han, Heung Nam; Ramamurty, Upadrasta; Wang, Lu; Xue, Yunfei
- Issue Date
- Apr-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- High-entropy alloy; Grain size effect; High-pressure torsion; Nanoindentation; Strain-rate sensitivity
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.782, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 782
- Start Page
- 1
- End Page
- 5
- ISSN
- 0921-5093
- Abstract
- Strain rate sensitivity (SRS) of a face-centered cubic (fcc) CoCrFeNi high-entropy alloy (HEA) with grain sizes ranging from 57 mu m to 45 nm was investigated using nanoindentation, and was compared with those reported for conventional fcc metals. Experimental results show pronounced grain boundary strengthening in the HEA. Estimated values of the SRS parameter, m and activation volume, V*, indicate similar plastic deformation mechanisms in HEA and Ni in nanocrystalline regime that are grain boundary mediated. In coarse-grained regime, the high lattice friction stress in the HEA results in much higher m and smaller V* as compared to coarse grained Ni.
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Related Researcher
- Jang, Jae Il
- COLLEGE OF ENGINEERING (SCHOOL OF MATERIALS SCIENCE AND ENGINEERING)