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

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...

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Bibliographic Details
Published in:Intermetallics 2021-11, Vol.138, p.107319, Article 107319
Main Authors: Kim, Young-Kyun, Ahn, Ji-Eun, Song, Yongwook, Choi, Hyunjoo, Yang, Sangsun, Lee, Kee-Ahn
Format: Article
Language:English
Subjects:
Dispersion hardening
Grinding mills
High entropy alloys
High-entropy alloy
Laser beam melting
Mechanical properties
Microstructure
Nanocomposite
Nanocomposites
Nanohardness
Nanoindentation
Nanoparticles
Rapid prototyping
Selective laser melting
Y2O3
Yttrium oxide
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Summary: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. •Y2O3-reinforced HEA matrix nanocomposite was firstly tried to manufacture by SLM.•SLM-nanocomposite shows heterogenous grain, dislocation networks and nano-sized Y2O3.•SLM-nanocomposite reveals exceptional indentation hardness property.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2021.107319