Mechanical response and deformation behavior of Al0.6CoCrFeNi high-entropy alloys upon dynamic loading

L. Wang; J. W. Qiao; S. G. Ma; Z. M. Jiao; T. W. Zhang; G. Chen; D. Zhao; Y. Zhang; Z. H. Wang

doi:10.1016/j.msea.2018.05.001

Mechanical response and deformation behavior of Al_0.6CoCrFeNi high-entropy alloys upon dynamic loading

L. Wang
, J. W. Qiao
, S. G. Ma^*
, Z. M. Jiao
, T. W. Zhang
, G. Chen
, D. Zhao
, Y. Zhang
, Z. H. Wang

^*Corresponding author for this work

Taiyuan University of Technology
University of Science and Technology Beijing

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

146 Citations (Scopus)

Abstract

The mechanical properties and microstructure evolution of dual-phase Al_0.6CoCrFeNi high-entropy alloys (HEAs) upon dynamic loading are investigated. Dynamic impact tests with varying strain rates of 2800–4000 s⁻¹ at room temperature are performed by the split-Hopkinson pressure bar (SHPB). The yielding strengths evidently increase with increasing the strain rate for the present system. The high strain-rate sensitivity (SRS) parameter is extracted from the observed stress-strain responses. A modified Johnson-Cook (J-C) plasticity constitutive model is proposed to characterize the dynamic flow behavior. Nanoscale deformation twins induced by dynamic loading, accompanied by high density dislocation substructures, realize the excellent strength-ductility combination. According to the critical stress theory, the stacking fault energy (SFE) of the FCC phase can be estimated to be about 36 mJ/m², which is evidently lower than the overall SFE for the Al_0.6CoCrFeNi HEA.

Original language	English
Pages (from-to)	208-213
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	727
DOIs	https://doi.org/10.1016/j.msea.2018.05.001
Publication status	Published - 6 Jun 2018
Externally published	Yes

Keywords

Deformation twins
Dynamic loading
High entropy alloy
Mechanical property

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10.1016/j.msea.2018.05.001

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@article{932e2e11b4a543f5bfcefa098905850e,

title = "Mechanical response and deformation behavior of Al0.6CoCrFeNi high-entropy alloys upon dynamic loading",

abstract = "The mechanical properties and microstructure evolution of dual-phase Al0.6CoCrFeNi high-entropy alloys (HEAs) upon dynamic loading are investigated. Dynamic impact tests with varying strain rates of 2800{\textendash}4000 s−1 at room temperature are performed by the split-Hopkinson pressure bar (SHPB). The yielding strengths evidently increase with increasing the strain rate for the present system. The high strain-rate sensitivity (SRS) parameter is extracted from the observed stress-strain responses. A modified Johnson-Cook (J-C) plasticity constitutive model is proposed to characterize the dynamic flow behavior. Nanoscale deformation twins induced by dynamic loading, accompanied by high density dislocation substructures, realize the excellent strength-ductility combination. According to the critical stress theory, the stacking fault energy (SFE) of the FCC phase can be estimated to be about 36 mJ/m2, which is evidently lower than the overall SFE for the Al0.6CoCrFeNi HEA.",

keywords = "Deformation twins, Dynamic loading, High entropy alloy, Mechanical property",

author = "L. Wang and Qiao, \{J. W.\} and Ma, \{S. G.\} and Jiao, \{Z. M.\} and Zhang, \{T. W.\} and G. Chen and D. Zhao and Y. Zhang and Wang, \{Z. H.\}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = jun,

day = "6",

doi = "10.1016/j.msea.2018.05.001",

language = "English",

volume = "727",

pages = "208--213",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Mechanical response and deformation behavior of Al0.6CoCrFeNi high-entropy alloys upon dynamic loading

AU - Wang, L.

AU - Qiao, J. W.

AU - Ma, S. G.

AU - Jiao, Z. M.

AU - Zhang, T. W.

AU - Chen, G.

AU - Zhao, D.

AU - Zhang, Y.

AU - Wang, Z. H.

PY - 2018/6/6

Y1 - 2018/6/6

N2 - The mechanical properties and microstructure evolution of dual-phase Al0.6CoCrFeNi high-entropy alloys (HEAs) upon dynamic loading are investigated. Dynamic impact tests with varying strain rates of 2800–4000 s−1 at room temperature are performed by the split-Hopkinson pressure bar (SHPB). The yielding strengths evidently increase with increasing the strain rate for the present system. The high strain-rate sensitivity (SRS) parameter is extracted from the observed stress-strain responses. A modified Johnson-Cook (J-C) plasticity constitutive model is proposed to characterize the dynamic flow behavior. Nanoscale deformation twins induced by dynamic loading, accompanied by high density dislocation substructures, realize the excellent strength-ductility combination. According to the critical stress theory, the stacking fault energy (SFE) of the FCC phase can be estimated to be about 36 mJ/m2, which is evidently lower than the overall SFE for the Al0.6CoCrFeNi HEA.

AB - The mechanical properties and microstructure evolution of dual-phase Al0.6CoCrFeNi high-entropy alloys (HEAs) upon dynamic loading are investigated. Dynamic impact tests with varying strain rates of 2800–4000 s−1 at room temperature are performed by the split-Hopkinson pressure bar (SHPB). The yielding strengths evidently increase with increasing the strain rate for the present system. The high strain-rate sensitivity (SRS) parameter is extracted from the observed stress-strain responses. A modified Johnson-Cook (J-C) plasticity constitutive model is proposed to characterize the dynamic flow behavior. Nanoscale deformation twins induced by dynamic loading, accompanied by high density dislocation substructures, realize the excellent strength-ductility combination. According to the critical stress theory, the stacking fault energy (SFE) of the FCC phase can be estimated to be about 36 mJ/m2, which is evidently lower than the overall SFE for the Al0.6CoCrFeNi HEA.

KW - Deformation twins

KW - Dynamic loading

KW - High entropy alloy

KW - Mechanical property

UR - https://www.scopus.com/pages/publications/85046696598

U2 - 10.1016/j.msea.2018.05.001

DO - 10.1016/j.msea.2018.05.001

M3 - Article

AN - SCOPUS:85046696598

SN - 0921-5093

VL - 727

SP - 208

EP - 213

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Mechanical response and deformation behavior of Al_0.6CoCrFeNi high-entropy alloys upon dynamic loading

Abstract

Keywords

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