Effect of C content on the microstructural evolution and wear resistance of AlCoCrFeNiTiW high-entropy alloy coatings

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-04-01 DOI:10.1016/j.surfcoat.2025.132115

Kedong Yu , Zhen Li , Fujie Zhou , Yingzhe Li , Jinglong Tang , Zhen Luo

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Abstract

Laser cladding was used to fabricate AlCoCrFeNiTiWC_x high-entropy alloy (HEA) coatings (x = 0, 0.5, 1, 1.5, 2) reinforced with μ-phase and in-situ (Ti, W)C carbides. The influence of carbon content on the coatings' microstructure, microhardness, and wear resistance was examined. Results showed that all coatings exhibited a dominant BCC phase. With increasing carbon content, the μ-phase evolved from a blocky to a network-like structure, while its volume fraction decreased. Simultaneously, the carbides transformed from near-spherical to flower-like and dendritic morphologies, with their volume fraction increasing. Wear resistance initially improved and then declined, with the C₁ coating demonstrating the highest resistance. The primary wear mechanisms were abrasive and oxidative wear. Strengthening mechanisms included solid solution strengthening, secondary phase strengthening by μ-phase and in-situ carbides, and grain refinement strengthening.

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C含量对AlCoCrFeNiTiW高熵合金涂层组织演变及耐磨性的影响

采用激光熔覆法制备了μ相和原位（Ti， W）C碳化物增强的AlCoCrFeNiTiWCx高熵合金（HEA）涂层（x = 0,0.5, 1,1.5, 2）。考察了碳含量对涂层显微组织、显微硬度和耐磨性的影响。结果表明，所有涂层均以BCC相为主。随着碳含量的增加，μ相由块状结构演变为网状结构，其体积分数逐渐减小。同时，随着碳化物体积分数的增加，碳化物由近球形形态转变为花状和枝晶形态。耐磨性先提高后下降，其中C1涂层耐磨性最高。磨损机制主要为磨粒磨损和氧化磨损。强化机制包括固溶体强化、μ相和原位碳化物的二次相强化和晶粒细化强化。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.