Microstructure and properties of Nano-WC particle-reinforced lamellar eutectic high-entropy alloy by laser directed energy deposition

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-10-18 DOI:10.1016/j.intermet.2025.109038

Bin Wang , Yaoning Sun , Ning Wei , Yifei Xu , Liufei Huang

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引用次数: 0

Abstract

This study fabricated AlCoCrFeNi_2.1 eutectic high-entropy alloy (EHEA) composites with varying WC contents (0 wt%, 2.5 wt%, and 5 wt%) via laser-directed energy deposition (DED). The microstructural evolution, mechanical properties, tribological behavior, and corrosion resistance of DED-processed composites were systematically investigated. Results indicate that the pristine EHEA exhibited typical lamellar eutectic structures with epitaxial growth along the thermal gradient direction. WC incorporation refined the as-printed microstructure, transforming the eutectic morphology from lamellar to island-like configurations. Consequently, the DED-EHEA-2.5WC composite demonstrated enhanced yield strength (774 MPa) and ultimate tensile strength (1240 MPa), representing improvements of 14.84 % and 12.22 % over the base EHEA (674 MPa and 1105 MPa), respectively. Wear testing revealed that DED-EHEA-2.5WC exhibited 42.24 % and 38.11 % lower wear rates than DED-EHEA and DED-EHEA-5WC counterparts. Furthermore, optimal WC addition (2.5 wt%) improved corrosion resistance, evidenced by an 81.6 mV nobler corrosion potential and 52.83 % reduction in corrosion current density versus EHEA. XPS analysis confirmed that WC addition stabilized and densified Al₂O₃ passive films, Cr₂O₃ layers, and WO₃ phases through three synergistic mechanisms: reinforcement strengthening, passive film optimization, and oxide phase stabilization. This work proposes a novel strategy for achieving multi-property synergy in additively manufactured eutectic high-entropy alloys.

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激光定向能沉积纳米wc颗粒增强层状共晶高熵合金的组织与性能

本研究采用激光定向能沉积（DED）法制备了WC含量（0 wt%、2.5 wt%和5 wt%）不同的AlCoCrFeNi2.1共晶高熵合金（EHEA）复合材料。系统地研究了ded复合材料的显微组织演变、力学性能、摩擦学行为和耐蚀性能。结果表明，原始EHEA呈现典型的片层共晶结构，并沿热梯度方向外延生长。WC的加入改善了印刷时的微观结构，将共晶形态从片层转变为岛状结构。结果表明，d -EHEA-2.5 wc复合材料的屈服强度（774 MPa）和极限抗拉强度（1240 MPa）分别比基体EHEA （674 MPa和1105 MPa）提高了14.84%和12.22%。磨损试验表明，与d - ehea和d - ehea - 5wc相比，d - ehea -2.5 wc的磨损率分别降低了42.24%和38.11%。此外，最佳WC添加量（2.5 wt%）提高了耐腐蚀性，与EHEA相比，腐蚀电位提高了81.6 mV，腐蚀电流密度降低了52.83%。XPS分析证实WC的加入通过强化、钝化膜优化和氧化相稳定三种协同机制稳定和致密化了Al2O3钝化膜、Cr2O3层和WO3相。本文提出了增材制造共晶高熵合金中实现多性能协同的新策略。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.