Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains

Qian Xiao; Yao Jian Liang; Qi Chen; Gang Sha; Wenjun Lu; Wenqi Guo; Lu Wang; Fuchi Wang; Hongnian Cai; Yunfei Xue

doi:10.1016/j.msea.2020.139474

Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains

Qian Xiao, Yao Jian Liang, Qi Chen, Gang Sha, Wenjun Lu, Wenqi Guo, Lu Wang, Fuchi Wang, Hongnian Cai, Yunfei Xue^*

^*Corresponding author for this work

School of Material Science and Engineering

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

9 Citations (Scopus)

Abstract

Every strengthening/hardening method has its own limit. However, it is difficult to couple multiple extreme hardening in a bulk material, especially for highly strengthened ones. Here we demonstrate a strategy to further harden an ultrastrong precipitation-hardened high entropy alloy (HEA) with ultrafine-grain (UFG)/nanograin (NG) bands. These UFG/NG bands with nanoprecipitates were obtained by combining local severe plastic deformation (SPD) from cryogenic rolling and the pinning effect of precipitates during recrystallization. We found that the bands, with combined hardening of NGs and nanoprecipitates, provide an amazing yield strength of ~2.8 GPa and an ultrahigh hardness of ~9.7 GPa. Such nanoprecipitation-hardened UFG/NG bands in the bulk HEA contribute to an extra strengthening close to 300 MPa and an extremely high tensile strength of more than 2.2 GPa. This research presents a possibility for obtaining NG structure in bulk metals which will open new avenues for developing stronger alloys.

Original language	English
Article number	139474
Journal	Materials Science and Engineering: A
Volume	787
DOIs	https://doi.org/10.1016/j.msea.2020.139474
Publication status	Published - 10 Jun 2020

Keywords

Cryo-rolling
High-entropy alloy
Mechanical properties
Nanograin
Nanoprecipitates

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title = "Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains",

abstract = "Every strengthening/hardening method has its own limit. However, it is difficult to couple multiple extreme hardening in a bulk material, especially for highly strengthened ones. Here we demonstrate a strategy to further harden an ultrastrong precipitation-hardened high entropy alloy (HEA) with ultrafine-grain (UFG)/nanograin (NG) bands. These UFG/NG bands with nanoprecipitates were obtained by combining local severe plastic deformation (SPD) from cryogenic rolling and the pinning effect of precipitates during recrystallization. We found that the bands, with combined hardening of NGs and nanoprecipitates, provide an amazing yield strength of ~2.8 GPa and an ultrahigh hardness of ~9.7 GPa. Such nanoprecipitation-hardened UFG/NG bands in the bulk HEA contribute to an extra strengthening close to 300 MPa and an extremely high tensile strength of more than 2.2 GPa. This research presents a possibility for obtaining NG structure in bulk metals which will open new avenues for developing stronger alloys.",

keywords = "Cryo-rolling, High-entropy alloy, Mechanical properties, Nanograin, Nanoprecipitates",

author = "Qian Xiao and Liang, {Yao Jian} and Qi Chen and Gang Sha and Wenjun Lu and Wenqi Guo and Lu Wang and Fuchi Wang and Hongnian Cai and Yunfei Xue",

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doi = "10.1016/j.msea.2020.139474",

language = "English",

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T1 - Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains

AU - Xiao, Qian

AU - Liang, Yao Jian

AU - Chen, Qi

AU - Sha, Gang

AU - Lu, Wenjun

AU - Guo, Wenqi

AU - Wang, Lu

AU - Wang, Fuchi

AU - Cai, Hongnian

AU - Xue, Yunfei

PY - 2020/6/10

Y1 - 2020/6/10

N2 - Every strengthening/hardening method has its own limit. However, it is difficult to couple multiple extreme hardening in a bulk material, especially for highly strengthened ones. Here we demonstrate a strategy to further harden an ultrastrong precipitation-hardened high entropy alloy (HEA) with ultrafine-grain (UFG)/nanograin (NG) bands. These UFG/NG bands with nanoprecipitates were obtained by combining local severe plastic deformation (SPD) from cryogenic rolling and the pinning effect of precipitates during recrystallization. We found that the bands, with combined hardening of NGs and nanoprecipitates, provide an amazing yield strength of ~2.8 GPa and an ultrahigh hardness of ~9.7 GPa. Such nanoprecipitation-hardened UFG/NG bands in the bulk HEA contribute to an extra strengthening close to 300 MPa and an extremely high tensile strength of more than 2.2 GPa. This research presents a possibility for obtaining NG structure in bulk metals which will open new avenues for developing stronger alloys.

AB - Every strengthening/hardening method has its own limit. However, it is difficult to couple multiple extreme hardening in a bulk material, especially for highly strengthened ones. Here we demonstrate a strategy to further harden an ultrastrong precipitation-hardened high entropy alloy (HEA) with ultrafine-grain (UFG)/nanograin (NG) bands. These UFG/NG bands with nanoprecipitates were obtained by combining local severe plastic deformation (SPD) from cryogenic rolling and the pinning effect of precipitates during recrystallization. We found that the bands, with combined hardening of NGs and nanoprecipitates, provide an amazing yield strength of ~2.8 GPa and an ultrahigh hardness of ~9.7 GPa. Such nanoprecipitation-hardened UFG/NG bands in the bulk HEA contribute to an extra strengthening close to 300 MPa and an extremely high tensile strength of more than 2.2 GPa. This research presents a possibility for obtaining NG structure in bulk metals which will open new avenues for developing stronger alloys.

KW - Cryo-rolling

KW - High-entropy alloy

KW - Mechanical properties

KW - Nanograin

KW - Nanoprecipitates

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DO - 10.1016/j.msea.2020.139474

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Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains

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Keywords

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