Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy

Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEA...

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Veröffentlicht in:Science advances 2020-09, Vol.6 (37)
Hauptverfasser: Lee, Chanho, Kim, George, Chou, Yi, Musicó, Brianna L, Gao, Michael C, An, Ke, Song, Gian, Chou, Yi-Chia, Keppens, Veerle, Chen, Wei, Liaw, Peter K
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container_issue 37
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container_title Science advances
container_volume 6
creator Lee, Chanho
Kim, George
Chou, Yi
Musicó, Brianna L
Gao, Michael C
An, Ke
Song, Gian
Chou, Yi-Chia
Keppens, Veerle
Chen, Wei
Liaw, Peter K
description Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic and plastic deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures using integrated experimental efforts and theoretical calculations. The in situ neutron diffraction results reveal a temperature-dependent elastic anisotropic deformation behavior. The single-crystal elastic moduli and macroscopic Young's, shear, and bulk moduli were determined from the in situ neutron diffraction, showing great agreement with first-principles calculations, machine learning, and resonant ultrasound spectroscopy results. Furthermore, the edge dislocation-dominant plastic deformation behaviors, which are different from conventional BCC alloys, were quantitatively described by the Williamson-Hall plot profile modeling and high-angle annular dark-field scanning transmission electron microscopy.
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SciAdv r-articles
title Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy
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