Effect of Ti and WC on the Microstructure and Mechanical Properties of Laser Cladding AlCoCrFeNi High-Entropy Alloys

IF 0.8 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Protection of Metals and Physical Chemistry of Surfaces Pub Date : 2025-03-09 DOI:10.1134/S207020512470223X

Nana Liu, Cainian Jing, Tao Lin, Yingming Tu, Tinglin Fu

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Abstract

To improve the hardness of AlCoCrFeNi high-entropy alloy coatings, Ti and WC are added to the high-entropy alloys in this paper. Composite coatings of AlCoCrFeNi, Ti, and x-WC (x = 3, 6, 9 wt %) on the surface of H13 hot work die steel are prepared by laser cladding. Coatings are characterized by hardness test, electrochemical test, friction and wear experiment, X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and EBSD (electron backscatter diffraction). The results reveal that the crystal structure of the coatings does not alter after the addition of Ti and WC. Coatings consisting of BCC/B2 and precipitated phases. BCC/B2 phases are mainly Al–Ni, and Fe–Cr phases. The precipitated phases are the WC and TiC phases. The results indicate that the hardness is improved after the addition of Ti and WC. Besides, the wear mechanism becomes different, and the grain size is refined. Coating hardness is increased from 528.9HV_0.5 to 625.3HV_0.5. Wear mechanisms change to oxidative, adhesive, and abrasive wear with the addition of Ti and WC. The precipitation of the second phase deteriorates the corrosion resistance of the coatings.

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Ti和WC对激光熔覆AlCoCrFeNi高熵合金组织和力学性能的影响

为了提高AlCoCrFeNi高熵合金涂层的硬度，本文在高熵合金中加入了Ti和WC。采用激光熔覆的方法在H13热加工模型钢表面制备了AlCoCrFeNi、Ti和x- wc （x = 3,6,9 wt %）复合涂层。通过硬度测试、电化学测试、摩擦磨损实验、x射线衍射仪（XRD）、扫描电镜（SEM）、能谱仪（EDS）和电子背散射衍射（EBSD）对涂层进行表征。结果表明，Ti和WC的加入并没有改变镀层的晶体结构。由BCC/B2和沉淀相组成的涂层。BCC/B2相主要为Al-Ni和Fe-Cr相。析出相为WC和TiC相。结果表明，加入Ti和WC后，合金的硬度有所提高。磨损机理不同，晶粒尺寸细化。镀层硬度由528.9HV0.5提高到625.3HV0.5。随着钛和WC的加入，磨损机制转变为氧化磨损、粘着磨损和磨粒磨损。第二相的析出降低了涂层的耐蚀性。

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来源期刊

Protection of Metals and Physical Chemistry of Surfaces 工程技术-冶金工程

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles covering all aspects of the physical chemistry of materials and interfaces in various environments. The journal covers all related problems of modern physical chemistry and materials science, including: physicochemical processes at interfaces; adsorption phenomena; complexing from molecular and supramolecular structures at the interfaces to new substances, materials and coatings; nanoscale and nanostructured materials and coatings, composed and dispersed materials; physicochemical problems of corrosion, degradation and protection; investigation methods for surface and interface systems, processes, structures, materials and coatings. No principe restrictions exist related systems, types of processes, methods of control and study. The journal welcomes conceptual, theoretical, experimental, methodological, instrumental, environmental, and all other possible studies.