Temperature-dependent mechanical behavior of an Al0.5Cr0.9FeNi2.5V0.2 high-entropy alloy

Shichao Zhou; Peter K. Liaw; Yunfei Xue; Yong Zhang

doi:10.1063/5.0064821

Temperature-dependent mechanical behavior of an Al_0.5Cr_0.9FeNi_2.5V_0.2 high-entropy alloy

Shichao Zhou, Peter K. Liaw, Yunfei Xue, Yong Zhang^*

^*Corresponding author for this work

School of Material Science and Engineering

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

15 Citations (Scopus)

Abstract

High-entropy alloys (HEAs) with a ductile face-centered-cubic matrix and coherent nano-precipitates (L1₂) are promising candidate materials for heat-resistant applications. In the present work, we systematically investigated the mechanical behavior of a wrought L1₂-type-strengthened HEA, Al_0.5Cr_0.9FeNi_2.5V_0.2, at elevated temperatures ranging from 500 to 900 °C. We find that the Al_0.5Cr_0.9FeNi_2.5V_0.2 HEA shows a moderate strength (∼875 MPa) as well as ductility (∼15%) at 500 °C and then a distinct ductile-to-brittle transition at 600 °C due to the brittle body-centered-cubic phase and weak deformation accommodation at grain boundaries (GBs). The further increase in temperatures up to 850 °C caused a decrease in strength but an increase in ductility owing to the occurrence of dynamic restoration. Correspondingly, kernel average misorientation maps of specimens exhibited a strain concentration along GBs and different deformation accommodation abilities under various conditions.

Original language	English
Article number	121902
Journal	Applied Physics Letters
Volume	119
Issue number	12
DOIs	https://doi.org/10.1063/5.0064821
Publication status	Published - 20 Sept 2021

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title = "Temperature-dependent mechanical behavior of an Al0.5Cr0.9FeNi2.5V0.2 high-entropy alloy",

abstract = "High-entropy alloys (HEAs) with a ductile face-centered-cubic matrix and coherent nano-precipitates (L12) are promising candidate materials for heat-resistant applications. In the present work, we systematically investigated the mechanical behavior of a wrought L12-type-strengthened HEA, Al0.5Cr0.9FeNi2.5V0.2, at elevated temperatures ranging from 500 to 900 °C. We find that the Al0.5Cr0.9FeNi2.5V0.2 HEA shows a moderate strength (∼875 MPa) as well as ductility (∼15%) at 500 °C and then a distinct ductile-to-brittle transition at 600 °C due to the brittle body-centered-cubic phase and weak deformation accommodation at grain boundaries (GBs). The further increase in temperatures up to 850 °C caused a decrease in strength but an increase in ductility owing to the occurrence of dynamic restoration. Correspondingly, kernel average misorientation maps of specimens exhibited a strain concentration along GBs and different deformation accommodation abilities under various conditions.",

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AU - Liaw, Peter K.

AU - Xue, Yunfei

AU - Zhang, Yong

PY - 2021/9/20

Y1 - 2021/9/20

N2 - High-entropy alloys (HEAs) with a ductile face-centered-cubic matrix and coherent nano-precipitates (L12) are promising candidate materials for heat-resistant applications. In the present work, we systematically investigated the mechanical behavior of a wrought L12-type-strengthened HEA, Al0.5Cr0.9FeNi2.5V0.2, at elevated temperatures ranging from 500 to 900 °C. We find that the Al0.5Cr0.9FeNi2.5V0.2 HEA shows a moderate strength (∼875 MPa) as well as ductility (∼15%) at 500 °C and then a distinct ductile-to-brittle transition at 600 °C due to the brittle body-centered-cubic phase and weak deformation accommodation at grain boundaries (GBs). The further increase in temperatures up to 850 °C caused a decrease in strength but an increase in ductility owing to the occurrence of dynamic restoration. Correspondingly, kernel average misorientation maps of specimens exhibited a strain concentration along GBs and different deformation accommodation abilities under various conditions.

AB - High-entropy alloys (HEAs) with a ductile face-centered-cubic matrix and coherent nano-precipitates (L12) are promising candidate materials for heat-resistant applications. In the present work, we systematically investigated the mechanical behavior of a wrought L12-type-strengthened HEA, Al0.5Cr0.9FeNi2.5V0.2, at elevated temperatures ranging from 500 to 900 °C. We find that the Al0.5Cr0.9FeNi2.5V0.2 HEA shows a moderate strength (∼875 MPa) as well as ductility (∼15%) at 500 °C and then a distinct ductile-to-brittle transition at 600 °C due to the brittle body-centered-cubic phase and weak deformation accommodation at grain boundaries (GBs). The further increase in temperatures up to 850 °C caused a decrease in strength but an increase in ductility owing to the occurrence of dynamic restoration. Correspondingly, kernel average misorientation maps of specimens exhibited a strain concentration along GBs and different deformation accommodation abilities under various conditions.

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Temperature-dependent mechanical behavior of an Al_0.5Cr_0.9FeNi_2.5V_0.2 high-entropy alloy

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