Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy
- Title
- Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy
- Author
- 장재일
- Keywords
- High-entropy alloy; Grain size effect; High-pressure torsion; Nanoindentation; Strain-rate sensitivity
- Issue Date
- 2020-04
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 782, article no. 139281
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S0921509320303646?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/165721
- ISSN
- 0921-5093; 1873-4936
- DOI
- 10.1016/j.msea.2020.139281
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML