Selective laser melted CrMnFeCoNi + 3 wt% Y2O3 high-entropy alloy matrix nanocomposite: Fabrication, microstructure and nanoindentation properties

Young Kyun Kim; Ji Eun Ahn; Yongwook Song; Hyunjoo Choi; Sangsun Yang; Kee Ahn Lee

doi:10.1016/j.intermet.2021.107319

Selective laser melted CrMnFeCoNi + 3 wt% Y₂O₃ high-entropy alloy matrix nanocomposite: Fabrication, microstructure and nanoindentation properties

Young Kyun Kim, Ji Eun Ahn, Yongwook Song, Hyunjoo Choi, Sangsun Yang, Kee Ahn Lee

Department of Materials Science and Engineering

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

19 Scopus citations

Abstract

A Y₂O₃-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite was fabricated by high-energy attrition milling and selective laser melting (SLM) additive manufacturing. The SLM-built HEA nanocomposite possessed heterogeneous grain structures and substructures decorated with a dislocation network and exhibited a high number density of nano-sized Y₂O₃. The SLM-built HEA + Y₂O₃ nanocomposite exhibited higher nanohardness (~9.22 GPa) than other equiatomic CrMnFeCoNi HEAs produced by casting (~4.13 GPa) and SLM (~6.95 GPa). This suggested that the dispersion hardening by the Y₂O₃ nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y₂O₃ reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.

Original language	English
Article number	107319
Journal	Intermetallics
Volume	138
DOIs	https://doi.org/10.1016/j.intermet.2021.107319
State	Published - Nov 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

High-entropy alloy
Microstructure
Nanocomposite
Nanoindentation
Selective laser melting
YO

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10.1016/j.intermet.2021.107319

Cite this

@article{90ac05a90efb47309358d48bad1f81f9,

title = "Selective laser melted CrMnFeCoNi + 3 wt% Y2O3 high-entropy alloy matrix nanocomposite: Fabrication, microstructure and nanoindentation properties",

abstract = "A Y2O3-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite was fabricated by high-energy attrition milling and selective laser melting (SLM) additive manufacturing. The SLM-built HEA nanocomposite possessed heterogeneous grain structures and substructures decorated with a dislocation network and exhibited a high number density of nano-sized Y2O3. The SLM-built HEA + Y2O3 nanocomposite exhibited higher nanohardness (~9.22 GPa) than other equiatomic CrMnFeCoNi HEAs produced by casting (~4.13 GPa) and SLM (~6.95 GPa). This suggested that the dispersion hardening by the Y2O3 nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y2O3 reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.",

keywords = "High-entropy alloy, Microstructure, Nanocomposite, Nanoindentation, Selective laser melting, YO",

author = "Kim, {Young Kyun} and Ahn, {Ji Eun} and Yongwook Song and Hyunjoo Choi and Sangsun Yang and Lee, {Kee Ahn}",

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

year = "2021",

month = nov,

doi = "10.1016/j.intermet.2021.107319",

language = "English",

volume = "138",

journal = "Intermetallics",

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T1 - Selective laser melted CrMnFeCoNi + 3 wt% Y2O3 high-entropy alloy matrix nanocomposite

T2 - Fabrication, microstructure and nanoindentation properties

AU - Kim, Young Kyun

AU - Ahn, Ji Eun

AU - Song, Yongwook

AU - Choi, Hyunjoo

AU - Yang, Sangsun

AU - Lee, Kee Ahn

PY - 2021/11

Y1 - 2021/11

N2 - A Y2O3-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite was fabricated by high-energy attrition milling and selective laser melting (SLM) additive manufacturing. The SLM-built HEA nanocomposite possessed heterogeneous grain structures and substructures decorated with a dislocation network and exhibited a high number density of nano-sized Y2O3. The SLM-built HEA + Y2O3 nanocomposite exhibited higher nanohardness (~9.22 GPa) than other equiatomic CrMnFeCoNi HEAs produced by casting (~4.13 GPa) and SLM (~6.95 GPa). This suggested that the dispersion hardening by the Y2O3 nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y2O3 reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.

AB - A Y2O3-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite was fabricated by high-energy attrition milling and selective laser melting (SLM) additive manufacturing. The SLM-built HEA nanocomposite possessed heterogeneous grain structures and substructures decorated with a dislocation network and exhibited a high number density of nano-sized Y2O3. The SLM-built HEA + Y2O3 nanocomposite exhibited higher nanohardness (~9.22 GPa) than other equiatomic CrMnFeCoNi HEAs produced by casting (~4.13 GPa) and SLM (~6.95 GPa). This suggested that the dispersion hardening by the Y2O3 nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y2O3 reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.

KW - High-entropy alloy

KW - Microstructure

KW - Nanocomposite

KW - Nanoindentation

KW - Selective laser melting

KW - YO

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