Cellular structure engineering of additive manufactured CoCrFeMnNi high-entropy composite: The role of hard ceramic reinforcements in elemental segregation of constitutive elements

Soung Yeoul Ahn; Farahnaz Haftlang; Eun Seong Kim; Ji Sun Lee; Sang Guk Jeong; Jae Bok Seol; Hyunjoo Choi; Hyoung Seop Kim

Additive Manufacturing Letters (Dec 2023)

Cellular structure engineering of additive manufactured CoCrFeMnNi high-entropy composite: The role of hard ceramic reinforcements in elemental segregation of constitutive elements

Soung Yeoul Ahn,
Farahnaz Haftlang,
Eun Seong Kim,
Ji Sun Lee,
Sang Guk Jeong,
Jae Bok Seol,
Hyunjoo Choi,
Hyoung Seop Kim

Affiliations

Soung Yeoul Ahn: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
Farahnaz Haftlang: Graduate Institute of Ferrous & Eco Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea; Department of Materials Science & Engineering, Northwestern University, IL 60208, USA; Corresponding authors at: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Eun Seong Kim: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
Ji Sun Lee: Graduate Institute of Ferrous & Eco Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
Sang Guk Jeong: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
Jae Bok Seol: Department of Materials Engineering and Convergence Technology (Center for K-Metals), Gyeongsang National University, Jinju 52828, Republic of Korea
Hyunjoo Choi: Department of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Hyoung Seop Kim: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea; Graduate Institute of Ferrous & Eco Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea; Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan; Institute for Convergence Research and Education in Advanced Technology, Yonsei University, Seoul 03722, Republic of Korea; Corresponding authors at: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

Journal volume & issue: Vol. 7
p. 100172

Abstract

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This study explores cellular structures in TiC/B4CCoCrFeMnNi high-entropy composites (HECs) fabricated by direct energy deposition (DED) additive manufacturing process, investigating the role of TiC and B4C nano-paticles in enhancing mechanical properties. Despite larger dislocation cell structures and thinner boundaries in TiC/B4CCoCrFeMnNi HECs compared to CoCrFeMnNi high-entropy alloy (HEA), they exhibit significantly higher hardness and strength, challenging traditional strength-size relationships. Additionally, we examine the behavior of ceramic nano-particles (TiC and B4C) with high melting points relative to matrix CoCrFeMnNi HEA. Rapid scanning prevents full nano-particle melting, leading to distinct element distribution of cell structure. These findings provide insights for selecting suitable nanoceramic particles in HEC development via metal additive manufacturing.

Published in Additive Manufacturing Letters

ISSN: 2772-3690 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Technology (General): Industrial engineering. Management engineering
Website: https://www.journals.elsevier.com/additive-manufacturing-letters/

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