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Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy
- Zhao, Yakai;
- Wang, Xutao;
- Cao, Tangqing;
- Han, Jae-Kyung;
- Kawasaki, Megumi;
- ... Jang, Jae-il;
- 외 4명
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67초록
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.
키워드
High-entropy alloy; Grain size effect; High-pressure torsion; Nanoindentation; Strain-rate sensitivity; HIGH-PRESSURE TORSION; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; MICROSTRUCTURE; DEPENDENCE; HARDNESS
- 제목
- Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy
- 저자
- Zhao, Yakai; Wang, Xutao; Cao, Tangqing; Han, Jae-Kyung; Kawasaki, Megumi; Jang, Jae-il; Han, Heung Nam; Ramamurty, Upadrasta; Wang, Lu; Xue, Yunfei
- 발행일
- 2020-04
- 유형
- Article
- 저널명
- Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
- 권
- 782
- 페이지
- 1 ~ 5