Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

D.H. Chung; J. Lee; Q.F. He; Y.K. Kim; K.R. Lim; H.S. Kim; Y. Yang; Y.S. Na

doi:10.1016/j.jmst.2022.10.036

Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

D.H. Chung, J. Lee, Q.F. He, Y.K. Kim, K.R. Lim, H.S. Kim, Y. Yang^*, Y.S. Na^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

37 Citations (Scopus)

Abstract

Heterostructured eutectic high-entropy alloys (EHEAs) have attracted significant attention owing to their novel properties, such as balanced combinations of strength and fracture toughness. However, the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated. In this study, we developed a series of dual-phase Al_(18–2_x₎Co₃₀Cr₍₁₁₊_x₎Fe₍₁₁₊_x₎Ni₃₀ (x= -1, 0, 1) eutectic and near-eutectic HEAs containing face-centered cubic (FCC) and body-centered cubic (BCC) phases. Despite the high amount of BCC, which is referred to as the brittle phase, newly developed EHEAs exhibited superior fracture toughness. Interestingly, we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness, outperforming our off-eutectic and other previously reported HEAs. By combining experiments and theoretical models, we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

Original language	English
Pages (from-to)	1-9
Journal	Journal of Materials Science and Technology
Volume	146
Online published	5 Dec 2022
DOIs	https://doi.org/10.1016/j.jmst.2022.10.036
Publication status	Published - 20 May 2023

Funding

This work was financially supported by the National Research Foundation of Korea (No. NRF-2021R1A6A3A0108674211), the Fundamental Research Program of the Korean Institute of Materials Science (No. PNK8730), and by Research Grant Council (RGC), Hong Kong Government, through General Research Fund (Nos. CityU11213118, CityU11200719 and CityU11209317).

Research Keywords

Eutectic high entropy alloy
Fracture toughness
Hetero deformation induced strengthening
Heterogeneous structure
Misorientation angle

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10.1016/j.jmst.2022.10.036

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title = "Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys",

abstract = "Heterostructured eutectic high-entropy alloys (EHEAs) have attracted significant attention owing to their novel properties, such as balanced combinations of strength and fracture toughness. However, the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated. In this study, we developed a series of dual-phase Al(18–2x)Co30Cr(11+x)Fe(11+x)Ni30 (x= -1, 0, 1) eutectic and near-eutectic HEAs containing face-centered cubic (FCC) and body-centered cubic (BCC) phases. Despite the high amount of BCC, which is referred to as the brittle phase, newly developed EHEAs exhibited superior fracture toughness. Interestingly, we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness, outperforming our off-eutectic and other previously reported HEAs. By combining experiments and theoretical models, we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.",

keywords = "Eutectic high entropy alloy, Fracture toughness, Hetero deformation induced strengthening, Heterogeneous structure, Misorientation angle",

author = "D.H. Chung and J. Lee and Q.F. He and Y.K. Kim and K.R. Lim and H.S. Kim and Y. Yang and Y.S. Na",

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TY - JOUR

T1 - Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

AU - Chung, D.H.

AU - Lee, J.

AU - He, Q.F.

AU - Kim, Y.K.

AU - Lim, K.R.

AU - Kim, H.S.

AU - Yang, Y.

AU - Na, Y.S.

PY - 2023/5/20

Y1 - 2023/5/20

N2 - Heterostructured eutectic high-entropy alloys (EHEAs) have attracted significant attention owing to their novel properties, such as balanced combinations of strength and fracture toughness. However, the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated. In this study, we developed a series of dual-phase Al(18–2x)Co30Cr(11+x)Fe(11+x)Ni30 (x= -1, 0, 1) eutectic and near-eutectic HEAs containing face-centered cubic (FCC) and body-centered cubic (BCC) phases. Despite the high amount of BCC, which is referred to as the brittle phase, newly developed EHEAs exhibited superior fracture toughness. Interestingly, we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness, outperforming our off-eutectic and other previously reported HEAs. By combining experiments and theoretical models, we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

AB - Heterostructured eutectic high-entropy alloys (EHEAs) have attracted significant attention owing to their novel properties, such as balanced combinations of strength and fracture toughness. However, the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated. In this study, we developed a series of dual-phase Al(18–2x)Co30Cr(11+x)Fe(11+x)Ni30 (x= -1, 0, 1) eutectic and near-eutectic HEAs containing face-centered cubic (FCC) and body-centered cubic (BCC) phases. Despite the high amount of BCC, which is referred to as the brittle phase, newly developed EHEAs exhibited superior fracture toughness. Interestingly, we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness, outperforming our off-eutectic and other previously reported HEAs. By combining experiments and theoretical models, we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

KW - Eutectic high entropy alloy

KW - Fracture toughness

KW - Hetero deformation induced strengthening

KW - Heterogeneous structure

KW - Misorientation angle

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U2 - 10.1016/j.jmst.2022.10.036

DO - 10.1016/j.jmst.2022.10.036

M3 - RGC 21 - Publication in refereed journal

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JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

ER -

Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

Abstract

Funding

Research Keywords

Access Output

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Corrigendum to “Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys” [Journal of Materials Science & Technology, Volume 146, 20 May 2023, Pages 1-9]

GRF: Development of Strong-yet-Ductile Nanograined Alloys with Intergranular Amorphous Films Based on Metallic-Glass Templates

GRF: The Development of Dual-Phase Fe-Based Metallic Glasses and Composites with Optimized Mechanical and Magnetic Properties

GRF: Optimizing Mechanical Properties of Metallic Glasses by Tuning Fast and Slow Secondary Relaxations

Cite this

Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

Abstract

Funding

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Research output

Corrigendum to “Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys” [Journal of Materials Science & Technology, Volume 146, 20 May 2023, Pages 1-9]

Projects

GRF: Development of Strong-yet-Ductile Nanograined Alloys with Intergranular Amorphous Films Based on Metallic-Glass Templates

GRF: The Development of Dual-Phase Fe-Based Metallic Glasses and Composites with Optimized Mechanical and Magnetic Properties

GRF: Optimizing Mechanical Properties of Metallic Glasses by Tuning Fast and Slow Secondary Relaxations

Cite this