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

IF 4.2 Q2 ENGINEERING, MANUFACTURING Additive manufacturing letters Pub Date : 2023-09-22 DOI:10.1016/j.addlet.2023.100172

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

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Abstract

This study explores cellular structures in TiC/B₄CCoCrFeMnNi 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/B₄CCoCrFeMnNi 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.

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增材制造CoCrFeMnNi高熵复合材料的胞状结构工程:硬质陶瓷增强剂在本构元素偏析中的作用

本研究探索了通过直接能量沉积（DED）增材制造工艺制备的TiC/B4CCoCrFeMnNi高熵复合材料（HECs）中的细胞结构，研究了TiC和B4C纳米颗粒在提高力学性能中的作用。尽管与CoCrFeMnNi高熵合金（HEA）相比，TiC/B4CCoCrFeMnNi HECs中的位错胞结构更大，边界更薄，但它们表现出显著更高的硬度和强度，挑战了传统的强度-尺寸关系。此外，我们还研究了具有高熔点的陶瓷纳米粒子（TiC和B4C）相对于基体CoCrFeMnNi HEA的行为。快速扫描可防止纳米颗粒完全熔化，导致细胞结构的元素分布明显。这些发现为通过金属增材制造在HEC开发中选择合适的纳米陶瓷颗粒提供了见解。

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