Tribological electrochemical and mechanical properties of FeCoNiCrAlx high-entropy alloy coatings prepared by laser cladding on 316 stainless steel

IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Liwei Du, Xuedao Shu, Haijie Xu, Chang Shu, Khamis Essa
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Abstract

FeCoNiCrAlx high-entropy alloy (HEA) coatings were synthesized on 316 stainless steel (SS) using laser cladding. The influence of Al content on the phase composition, microstructure, tribological behavior, electrochemical performance, and mechanical properties of the coatings was comprehensively examined. The findings reveal that the phase structure of the HEA coatings transitions from a single FCC phase (x = 0, 0.3) to a dual FCC + BCC phase (x = 0.5, 0.7) and ultimately to a single BCC phase (x = 1.0). With increasing Al content, the microstructure evolves from columnar to equiaxed crystals, accompanied by progressive grain refinement. This grain refinement enhances the hardness of the coatings, which correlates positively with improved tribological properties. At x = 1.0, the coating demonstrates the lowest wear rate. Conversely, the corrosion resistance decreases as Al content increases, with the minimum corrosion current density observed at x = 0 (22.491 μA·cm⁻2). Furthermore, the tensile properties improve initially and then deteriorate with increasing Al content, achieving optimal mechanical performance at x = 0.5. In conclusion, the HEA coatings significantly enhance the tribological, electrochemical, and mechanical properties of 316 SS.

316不锈钢激光熔覆法制备FeCoNiCrAlx高熵合金涂层的摩擦学、电化学和力学性能
采用激光熔覆技术在316不锈钢(SS)表面合成了FeCoNiCrAlx高熵合金(HEA)涂层。研究了Al含量对涂层的相组成、微观组织、摩擦学性能、电化学性能和力学性能的影响。结果表明,HEA涂层的相结构从单一FCC相(x = 0,0.3)转变为双FCC + BCC相(x = 0.5, 0.7),最终转变为单一BCC相(x = 1.0)。随着Al含量的增加,组织由柱状晶向等轴晶演变,晶粒逐渐细化。这种晶粒细化提高了涂层的硬度,这与摩擦学性能的改善呈正相关。当x = 1.0时,涂层的磨损率最低。相反,随着Al含量的增加,耐蚀性降低,腐蚀电流密度在x = 0时最小(22.491 μA·cm⁻2)。随着Al含量的增加,拉伸性能先改善后恶化,在x = 0.5时达到最佳力学性能。综上所述,HEA涂层显著提高了316 SS的摩擦学、电化学和力学性能。
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来源期刊
Journal of Materials Science
Journal of Materials Science 工程技术-材料科学:综合
CiteScore
7.90
自引率
4.40%
发文量
1297
审稿时长
2.4 months
期刊介绍: The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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