Selective laser melted CrMnFeCoNi + 3 wt% Y2O3 high-entropy alloy matrix nanocomposite: Fabrication, microstructure and nanoindentation properties. (November 2021)

• Record Type: Journal Article
• Authors: Kim, Young-Kyun; Ahn, Ji-Eun; Song, Yongwook; Choi, Hyunjoo; Yang, Sangsun; Lee, Kee-Ahn
• Is Part Of: Intermetallics. Volume 138(2021)
• Publication Date: 2021-11
• Subjects: Selective laser melting -- High-entropy alloy -- Y2O3 -- Nanocomposite -- Microstructure -- Nanoindentation; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2021.107319
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: A Y2 O3 -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 Y2 O3 . The SLM-built HEA + Y2 O3 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 Y2 O3 nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y2 O3 reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites. Highlights: Y2 O3 -reinforced HEA matrix nanocomposite was firstly tried to manufacture by SLM. SLM-nanocomposite shows heterogenous grain, dislocation networks and nano-sized Y2 O3 . SLM-nanocomposite reveals exceptional indentation hardness property.