Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys

Mao Yuan Luo; Tu Ngoc Lam; Pei Te Wang; Nien-Ti Tsou; Yao Jen Chang; Rui Feng; Takuro Kawasaki; Stefanus Harjo; Peter K. Liaw; An Chou Yeh; Soo Yeol Lee; Jayant Jain; E-Wen Huang

doi:10.1016/j.scriptamat.2021.114459

Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys

Mao Yuan Luo, Tu Ngoc Lam, Pei Te Wang, Nien-Ti Tsou, Yao Jen Chang, Rui Feng, Takuro Kawasaki, Stefanus Harjo, Peter K. Liaw, An Chou Yeh, Soo Yeol Lee^*, Jayant Jain, E-Wen Huang

^*Corresponding author for this work

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

20 Scopus citations

Abstract

The effect of grain size on strain-controlled low-cycle fatigue (LCF) properties in the CoCrFeMnNi high-entropy alloys (HEAs) was investigated towards the distinct microstructural developments during cyclic loading at a strain amplitude of ± 1.0%. A much more prominent secondary cyclic hardening (SCH) behavior at the final deformation stage was observed in the fine-grained (FG, 18 µm) than in the coarse-grained (CG, 184 µm) CoCrFeMnNi. In-situ neutron-diffraction and microscopic examination, strongly corroborated by molecular dynamic (MD) simulations, indicated that dislocation activities from planar slip to wavy slip-driven subgrain structures within the grains acted as the primary cyclic-deformation behaviors in the FG CoCrFeMnNi. Differently observed in the cyclic behavior of the CG CoCrFeMnNi was due to a transition from the planar dislocation slip to twinning. Our findings suggested that the fatigue-resistant HEAs can be designed via tuning the microstructure with an optimal range of grain size at a specific strain amplitude.

Original language	English
Article number	114459
Pages (from-to)	1-7
Number of pages	7
Journal	Scripta Materialia
Volume	210
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114459
State	Published - 15 Mar 2022

Keywords

Deformation twins
Grain size
High-entropy alloy
Low-cycle fatigue
Neutron-diffraction

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Luo, M. Y., Lam, T. N., Wang, P. T., Tsou, N.-T., Chang, Y. J., Feng, R., Kawasaki, T., Harjo, S., Liaw, P. K., Yeh, A. C., Lee, S. Y., Jain, J., & Huang, E.-W. (2022). Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys. Scripta Materialia, 210, 1-7. Article 114459. https://doi.org/10.1016/j.scriptamat.2021.114459

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title = "Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys",

abstract = "The effect of grain size on strain-controlled low-cycle fatigue (LCF) properties in the CoCrFeMnNi high-entropy alloys (HEAs) was investigated towards the distinct microstructural developments during cyclic loading at a strain amplitude of ± 1.0%. A much more prominent secondary cyclic hardening (SCH) behavior at the final deformation stage was observed in the fine-grained (FG, 18 µm) than in the coarse-grained (CG, 184 µm) CoCrFeMnNi. In-situ neutron-diffraction and microscopic examination, strongly corroborated by molecular dynamic (MD) simulations, indicated that dislocation activities from planar slip to wavy slip-driven subgrain structures within the grains acted as the primary cyclic-deformation behaviors in the FG CoCrFeMnNi. Differently observed in the cyclic behavior of the CG CoCrFeMnNi was due to a transition from the planar dislocation slip to twinning. Our findings suggested that the fatigue-resistant HEAs can be designed via tuning the microstructure with an optimal range of grain size at a specific strain amplitude.",

keywords = "Deformation twins, Grain size, High-entropy alloy, Low-cycle fatigue, Neutron-diffraction",

author = "Luo, {Mao Yuan} and Lam, {Tu Ngoc} and Wang, {Pei Te} and Nien-Ti Tsou and Chang, {Yao Jen} and Rui Feng and Takuro Kawasaki and Stefanus Harjo and Liaw, {Peter K.} and Yeh, {An Chou} and Lee, {Soo Yeol} and Jayant Jain and E-Wen Huang",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2022",

month = mar,

day = "15",

doi = "10.1016/j.scriptamat.2021.114459",

language = "English",

volume = "210",

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journal = "Scripta Materialia",

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TY - JOUR

T1 - Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys

AU - Luo, Mao Yuan

AU - Lam, Tu Ngoc

AU - Wang, Pei Te

AU - Tsou, Nien-Ti

AU - Chang, Yao Jen

AU - Feng, Rui

AU - Kawasaki, Takuro

AU - Harjo, Stefanus

AU - Liaw, Peter K.

AU - Yeh, An Chou

AU - Lee, Soo Yeol

AU - Jain, Jayant

AU - Huang, E-Wen

PY - 2022/3/15

Y1 - 2022/3/15

N2 - The effect of grain size on strain-controlled low-cycle fatigue (LCF) properties in the CoCrFeMnNi high-entropy alloys (HEAs) was investigated towards the distinct microstructural developments during cyclic loading at a strain amplitude of ± 1.0%. A much more prominent secondary cyclic hardening (SCH) behavior at the final deformation stage was observed in the fine-grained (FG, 18 µm) than in the coarse-grained (CG, 184 µm) CoCrFeMnNi. In-situ neutron-diffraction and microscopic examination, strongly corroborated by molecular dynamic (MD) simulations, indicated that dislocation activities from planar slip to wavy slip-driven subgrain structures within the grains acted as the primary cyclic-deformation behaviors in the FG CoCrFeMnNi. Differently observed in the cyclic behavior of the CG CoCrFeMnNi was due to a transition from the planar dislocation slip to twinning. Our findings suggested that the fatigue-resistant HEAs can be designed via tuning the microstructure with an optimal range of grain size at a specific strain amplitude.

AB - The effect of grain size on strain-controlled low-cycle fatigue (LCF) properties in the CoCrFeMnNi high-entropy alloys (HEAs) was investigated towards the distinct microstructural developments during cyclic loading at a strain amplitude of ± 1.0%. A much more prominent secondary cyclic hardening (SCH) behavior at the final deformation stage was observed in the fine-grained (FG, 18 µm) than in the coarse-grained (CG, 184 µm) CoCrFeMnNi. In-situ neutron-diffraction and microscopic examination, strongly corroborated by molecular dynamic (MD) simulations, indicated that dislocation activities from planar slip to wavy slip-driven subgrain structures within the grains acted as the primary cyclic-deformation behaviors in the FG CoCrFeMnNi. Differently observed in the cyclic behavior of the CG CoCrFeMnNi was due to a transition from the planar dislocation slip to twinning. Our findings suggested that the fatigue-resistant HEAs can be designed via tuning the microstructure with an optimal range of grain size at a specific strain amplitude.

KW - Deformation twins

KW - Grain size

KW - High-entropy alloy

KW - Low-cycle fatigue

KW - Neutron-diffraction

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U2 - 10.1016/j.scriptamat.2021.114459

DO - 10.1016/j.scriptamat.2021.114459

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JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114459

ER -

Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys

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