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^*

^*Corresponding author for this work

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

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
Publication status	Published - 24 Apr 2020

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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year = "2020",

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day = "24",

doi = "10.1016/j.msea.2020.139281",

language = "English",

volume = "782",

journal = "Materials Science and Engineering: A",

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TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=85082848545&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2020.139281

DO - 10.1016/j.msea.2020.139281

M3 - Article

AN - SCOPUS:85082848545

SN - 0921-5093

VL - 782

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 139281

ER -

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

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Keywords

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