Effect of strain rate on mechanical properties of HCP/FCC dual-phase CoCrFeNiNb0.5 high-entropy alloy

Zi hao MA; Bing HOU; Dong yang QIN; Yu long LI

doi:10.1016/S1003-6326(23)66171-0

Effect of strain rate on mechanical properties of HCP/FCC dual-phase CoCrFeNiNb_0.5 high-entropy alloy

Zi hao MA, Bing HOU, Dong yang QIN, Yu long LI

School of Civil Aviation

Northwestern Polytechnical University Xian

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

7 Scopus citations

Abstract

By using split-Hopkinson pressure bar, scanning electron microscope and transmission electron microscope, the influence of strain rate on mechanical behavior of the as-cast CoCrFeNiNb_0.5 high-entropy alloy (HEA) consisting of hexagonal close-packed (HCP) pro-eutectic phase and eutectic structure (HCP laminate and face-centered cubic (FCC) laminate) was investigated. As the strain rate increases from 1×10⁻⁴ to 6×10³ s⁻¹, it is found that yield strength does not increase evidently and that fracture strain drops drastically. Quasi-static deformation mechanism of HCP laminate is the multiplication of tangled dislocation. However, the dynamic deformation mechanism of HCP laminate is shearing. Shearing may lead to the formation of the micro-crack at low compression strain of 0.1. Since the number of the micro-crack increases rapidly with the increase of dynamic compression strain, the avalanche fracture of HEA, which is caused by the covalence of micro-crack evolved from the shearing of HCP laminate, occurred, contributing to the dynamic compressive embrittlement.

Original language	English
Pages (from-to)	1144-1155
Number of pages	12
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	33
Issue number	4
DOIs	https://doi.org/10.1016/S1003-6326(23)66171-0
State	Published - Apr 2023

Keywords

ductile-to-brittle transformation
eutectic structure
high strain rate
high-entropy alloy
shearing

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10.1016/S1003-6326(23)66171-0

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title = "Effect of strain rate on mechanical properties of HCP/FCC dual-phase CoCrFeNiNb0.5 high-entropy alloy",

abstract = "By using split-Hopkinson pressure bar, scanning electron microscope and transmission electron microscope, the influence of strain rate on mechanical behavior of the as-cast CoCrFeNiNb0.5 high-entropy alloy (HEA) consisting of hexagonal close-packed (HCP) pro-eutectic phase and eutectic structure (HCP laminate and face-centered cubic (FCC) laminate) was investigated. As the strain rate increases from 1×10−4 to 6×103 s−1, it is found that yield strength does not increase evidently and that fracture strain drops drastically. Quasi-static deformation mechanism of HCP laminate is the multiplication of tangled dislocation. However, the dynamic deformation mechanism of HCP laminate is shearing. Shearing may lead to the formation of the micro-crack at low compression strain of 0.1. Since the number of the micro-crack increases rapidly with the increase of dynamic compression strain, the avalanche fracture of HEA, which is caused by the covalence of micro-crack evolved from the shearing of HCP laminate, occurred, contributing to the dynamic compressive embrittlement.",

keywords = "ductile-to-brittle transformation, eutectic structure, high strain rate, high-entropy alloy, shearing",

author = "MA, {Zi hao} and Bing HOU and QIN, {Dong yang} and LI, {Yu long}",

note = "Publisher Copyright: {\textcopyright} 2023 The Nonferrous Metals Society of China",

year = "2023",

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doi = "10.1016/S1003-6326(23)66171-0",

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T1 - Effect of strain rate on mechanical properties of HCP/FCC dual-phase CoCrFeNiNb0.5 high-entropy alloy

AU - MA, Zi hao

AU - HOU, Bing

AU - QIN, Dong yang

AU - LI, Yu long

PY - 2023/4

Y1 - 2023/4

N2 - By using split-Hopkinson pressure bar, scanning electron microscope and transmission electron microscope, the influence of strain rate on mechanical behavior of the as-cast CoCrFeNiNb0.5 high-entropy alloy (HEA) consisting of hexagonal close-packed (HCP) pro-eutectic phase and eutectic structure (HCP laminate and face-centered cubic (FCC) laminate) was investigated. As the strain rate increases from 1×10−4 to 6×103 s−1, it is found that yield strength does not increase evidently and that fracture strain drops drastically. Quasi-static deformation mechanism of HCP laminate is the multiplication of tangled dislocation. However, the dynamic deformation mechanism of HCP laminate is shearing. Shearing may lead to the formation of the micro-crack at low compression strain of 0.1. Since the number of the micro-crack increases rapidly with the increase of dynamic compression strain, the avalanche fracture of HEA, which is caused by the covalence of micro-crack evolved from the shearing of HCP laminate, occurred, contributing to the dynamic compressive embrittlement.

AB - By using split-Hopkinson pressure bar, scanning electron microscope and transmission electron microscope, the influence of strain rate on mechanical behavior of the as-cast CoCrFeNiNb0.5 high-entropy alloy (HEA) consisting of hexagonal close-packed (HCP) pro-eutectic phase and eutectic structure (HCP laminate and face-centered cubic (FCC) laminate) was investigated. As the strain rate increases from 1×10−4 to 6×103 s−1, it is found that yield strength does not increase evidently and that fracture strain drops drastically. Quasi-static deformation mechanism of HCP laminate is the multiplication of tangled dislocation. However, the dynamic deformation mechanism of HCP laminate is shearing. Shearing may lead to the formation of the micro-crack at low compression strain of 0.1. Since the number of the micro-crack increases rapidly with the increase of dynamic compression strain, the avalanche fracture of HEA, which is caused by the covalence of micro-crack evolved from the shearing of HCP laminate, occurred, contributing to the dynamic compressive embrittlement.

KW - ductile-to-brittle transformation

KW - eutectic structure

KW - high strain rate

KW - high-entropy alloy

KW - shearing

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Effect of strain rate on mechanical properties of HCP/FCC dual-phase CoCrFeNiNb_0.5 high-entropy alloy

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