Microstructure and Mechanical Properties of High-Entropy Alloy Co20Cr26Fe20Mn20Ni14 Processed by High-Pressure Torsion at 77 K and 300 K

Jongun Moon; Yuanshen Qi; Elena Tabachnikova; Yuri Estrin; Won Mi Choi; Soo Hyun Joo; Byeong Joo Lee; Aleksey Podolskiy; Mikhail Tikhonovsky; Hyoung Seop Kim

doi:10.1038/s41598-018-29446-y

Microstructure and Mechanical Properties of High-Entropy Alloy Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄ Processed by High-Pressure Torsion at 77 K and 300 K

Jongun Moon, Yuanshen Qi, Elena Tabachnikova, Yuri Estrin, Won Mi Choi, Soo Hyun Joo, Byeong Joo Lee, Aleksey Podolskiy, Mikhail Tikhonovsky, Hyoung Seop Kim^*

^*Corresponding author for this work

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

46 Scopus citations

Abstract

In this work, the mechanical characteristics of high-entropy alloy Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄ with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were performed to identify the phase and microstructure variation and the mechanical properties characterized by Vickers hardness measurements and tensile testing. Cryogenic HPT was found to result in a lower mechanical strength of alloy Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄ than room temperature HPT. Microstructure analysis by SEM and TEM was conducted to shed light on the microstructural changes in the alloy Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄ caused by HPT processing. Electron microscopy data provided evidence of a deformation-induced phase transformation in the alloy processed by cryogenic HPT. Unusual softening phenomena induced by cryogenic HPT were characterized by analyzing the dislocation density as determined from X-Ray diffraction peak broadening.

Original language	English
Article number	11074
Journal	Scientific Reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-29446-y
State	Published - 1 Dec 2018
Externally published	Yes

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title = "Microstructure and Mechanical Properties of High-Entropy Alloy Co20Cr26Fe20Mn20Ni14 Processed by High-Pressure Torsion at 77 K and 300 K",

abstract = "In this work, the mechanical characteristics of high-entropy alloy Co20Cr26Fe20Mn20Ni14 with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were performed to identify the phase and microstructure variation and the mechanical properties characterized by Vickers hardness measurements and tensile testing. Cryogenic HPT was found to result in a lower mechanical strength of alloy Co20Cr26Fe20Mn20Ni14 than room temperature HPT. Microstructure analysis by SEM and TEM was conducted to shed light on the microstructural changes in the alloy Co20Cr26Fe20Mn20Ni14 caused by HPT processing. Electron microscopy data provided evidence of a deformation-induced phase transformation in the alloy processed by cryogenic HPT. Unusual softening phenomena induced by cryogenic HPT were characterized by analyzing the dislocation density as determined from X-Ray diffraction peak broadening.",

author = "Jongun Moon and Yuanshen Qi and Elena Tabachnikova and Yuri Estrin and Choi, {Won Mi} and Joo, {Soo Hyun} and Lee, {Byeong Joo} and Aleksey Podolskiy and Mikhail Tikhonovsky and Kim, {Hyoung Seop}",

note = "Publisher Copyright: {\textcopyright} 2018, The Author(s).",

year = "2018",

month = dec,

day = "1",

doi = "10.1038/s41598-018-29446-y",

language = "英语",

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T1 - Microstructure and Mechanical Properties of High-Entropy Alloy Co20Cr26Fe20Mn20Ni14 Processed by High-Pressure Torsion at 77 K and 300 K

AU - Moon, Jongun

AU - Qi, Yuanshen

AU - Tabachnikova, Elena

AU - Estrin, Yuri

AU - Choi, Won Mi

AU - Joo, Soo Hyun

AU - Lee, Byeong Joo

AU - Podolskiy, Aleksey

AU - Tikhonovsky, Mikhail

AU - Kim, Hyoung Seop

PY - 2018/12/1

Y1 - 2018/12/1

N2 - In this work, the mechanical characteristics of high-entropy alloy Co20Cr26Fe20Mn20Ni14 with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were performed to identify the phase and microstructure variation and the mechanical properties characterized by Vickers hardness measurements and tensile testing. Cryogenic HPT was found to result in a lower mechanical strength of alloy Co20Cr26Fe20Mn20Ni14 than room temperature HPT. Microstructure analysis by SEM and TEM was conducted to shed light on the microstructural changes in the alloy Co20Cr26Fe20Mn20Ni14 caused by HPT processing. Electron microscopy data provided evidence of a deformation-induced phase transformation in the alloy processed by cryogenic HPT. Unusual softening phenomena induced by cryogenic HPT were characterized by analyzing the dislocation density as determined from X-Ray diffraction peak broadening.

AB - In this work, the mechanical characteristics of high-entropy alloy Co20Cr26Fe20Mn20Ni14 with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were performed to identify the phase and microstructure variation and the mechanical properties characterized by Vickers hardness measurements and tensile testing. Cryogenic HPT was found to result in a lower mechanical strength of alloy Co20Cr26Fe20Mn20Ni14 than room temperature HPT. Microstructure analysis by SEM and TEM was conducted to shed light on the microstructural changes in the alloy Co20Cr26Fe20Mn20Ni14 caused by HPT processing. Electron microscopy data provided evidence of a deformation-induced phase transformation in the alloy processed by cryogenic HPT. Unusual softening phenomena induced by cryogenic HPT were characterized by analyzing the dislocation density as determined from X-Ray diffraction peak broadening.

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AN - SCOPUS:85050600749

SN - 2045-2322

VL - 8

JO - Scientific Reports

JF - Scientific Reports

IS - 1

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ER -

Microstructure and Mechanical Properties of High-Entropy Alloy Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄ Processed by High-Pressure Torsion at 77 K and 300 K

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