Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy

Yakai Zhao; Xutao Wang; Tangqing Cao; Jae Kyung Han; Megumi Kawasaki; Jae il Jang; Heung Nam Han; Upadrasta Ramamurty; Lu Wang; Yunfei Xue

doi:10.1016/j.msea.2020.139281

Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy

Yakai Zhao, Xutao Wang, Tangqing Cao, Jae Kyung Han, Megumi Kawasaki, Jae il Jang, Heung Nam Han, Upadrasta Ramamurty, Lu Wang, Yunfei Xue

Nuclear Fuel Element Performance

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Abstract

Strain rate sensitivity (SRS) of a face-centered cubic (fcc) CoCrFeNi high-entropy alloy (HEA) with grain sizes ranging from 57 μm 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.

Original language	English
Article number	139281
Journal	Materials Science and Engineering: A
Volume	782
DOIs	https://doi.org/10.1016/j.msea.2020.139281
State	Published - Apr 24 2020

Funding

The work at BIT was supported by the National Key Research and Development Program of China (grant number 2018YFB0703403 ). The work at Hanyang University was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIT) (No. 2020R1A2B5B01001446 and No. 2020R1A5A6017701) The work at Oregon State University was supported by the National Science Foundation of the United States (Grant No. DMR-1810343 ).

Keywords

Grain size effect
High-entropy alloy
High-pressure torsion
Nanoindentation
Strain-rate sensitivity

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10.1016/j.msea.2020.139281

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title = "Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy",

abstract = "Strain rate sensitivity (SRS) of a face-centered cubic (fcc) CoCrFeNi high-entropy alloy (HEA) with grain sizes ranging from 57 μm 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.",

keywords = "Grain size effect, High-entropy alloy, High-pressure torsion, Nanoindentation, Strain-rate sensitivity",

author = "Yakai Zhao and Xutao Wang and Tangqing Cao and Han, {Jae Kyung} and Megumi Kawasaki and Jang, {Jae il} and Han, {Heung Nam} and Upadrasta Ramamurty and Lu Wang and Yunfei Xue",

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T1 - Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy

AU - Zhao, Yakai

AU - Wang, Xutao

AU - Cao, Tangqing

AU - Han, Jae Kyung

AU - Kawasaki, Megumi

AU - Jang, Jae il

AU - Han, Heung Nam

AU - Ramamurty, Upadrasta

AU - Wang, Lu

AU - Xue, Yunfei

PY - 2020/4/24

Y1 - 2020/4/24

N2 - Strain rate sensitivity (SRS) of a face-centered cubic (fcc) CoCrFeNi high-entropy alloy (HEA) with grain sizes ranging from 57 μm 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.

AB - Strain rate sensitivity (SRS) of a face-centered cubic (fcc) CoCrFeNi high-entropy alloy (HEA) with grain sizes ranging from 57 μm 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.

KW - Grain size effect

KW - High-entropy alloy

KW - High-pressure torsion

KW - Nanoindentation

KW - Strain-rate sensitivity

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DO - 10.1016/j.msea.2020.139281

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JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

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ER -

Effect of grain size on the strain rate sensitivity of CoCrFeNi high-entropy alloy

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