Laser-deposited CoCrFeNiTiAlx high-entropy alloy coatings featuring balanced wear and corrosion resistance

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-09-23 DOI:10.1016/j.intermet.2025.109004

Fengyuan Shu , Jia Deng , Hua Yang , Xin Zhang , Zhuqiang Xiang , Jie Wang , Guibian Li , Yuzhong Ren , Bing Lei , Xin Yuan

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引用次数: 0

Abstract

CoCrFeNiTiAl_x (x = 0, 0.5, 0.75, 1.0) high-entropy alloy (HEA) coatings were fabricated by laser deposition (LD) technology and the effect of Al content in microstructure-property relationships was systematically investigated. The HEA coatings contain face-centered cubic(FCC) and body-centered cubic(BCC) structure, with ordered B2-type Al-Ni compounds emerging at x = 1. Increasing Al content promoted a progressive FCC to BCC phase transformation accompanied by lattice distortion and grain refinement. Notably, Al addition significantly improved coating formability by suppressing crack initiation during LD processes through its deoxidizing reduction and slagging capabilities, which optimized melt fluidity and minimized structural defects such as pores and cracks. The microhardness exhibited a 44 % enhancement (616.12 → 887.26 HV) with gradually Al increase, attributed to synergistic BCC phases, solid solution and Hall-Petch refinement strengthening. The average coefficient of friction and wear rate of the coatings both showed a decreasing trend, specifically an 83 % reduction in wear rate (14.12 → 2.42 × 10⁻⁵ mm³/N·m) at x = 0.75. Al addition converted the wear mechanism from adhesive-abrasive wear to oxidative wear via in-situ formation of Al₂O₃/Cr₂O₃ tribofilms. Al alloying also enhanced the corrosion resistance of the HEAs. The Al₁ coating exhibited the lowest I_corr (8.72 μA/cm²) and highest charge-transfer resistance(R_ct). These properties are attributed to the formation of denser and more stable Cr₂O₃ and TiO₂ passive film, which hindered the Cl⁻ transport and strengthened the anti-corrosion mechanism. The Al₁ coating exhibited the optimal comprehensive performance, which provided guidance for designing Al-containing HEAs with balanced corrosion resistance and mechanical performance.

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激光沉积CoCrFeNiTiAlx高熵合金涂层，具有平衡的耐磨性和耐腐蚀性

采用激光沉积（LD）技术制备了CoCrFeNiTiAlx （x = 0,0.5, 0.75, 1.0）高熵合金（HEA）涂层，并系统研究了Al含量对其组织性能关系的影响。HEA涂层具有面心立方（FCC）和体心立方（BCC）结构，在x = 1处出现有序的b2型Al-Ni化合物。Al含量的增加促进了FCC向BCC相变的递进过程，同时伴有晶格畸变和晶粒细化。值得注意的是，Al的加入通过其脱氧还原和结渣能力抑制了LD过程中的裂纹萌生，从而显著改善了涂层的成形性，从而优化了熔体流动性，最大限度地减少了气孔和裂纹等结构缺陷。随着Al的逐渐增加，显微硬度从616.12→887.26 HV提高了44%，这主要是由于BCC相、固溶体和Hall-Petch细化的协同强化。平均摩擦系数和磨损率均呈下降趋势，在x = 0.75时，磨损率降低了83%（14.12→2.42 × 10−5 mm3/N·m）。Al的加入通过原位形成Al2O3/Cr2O3摩擦膜使磨损机制从黏着磨料磨损转变为氧化磨损。铝合金的加入也提高了HEAs的耐蚀性。Al1涂层具有最低的Icorr （8.72 μA/cm2）和最高的电荷转移电阻（Rct）。这些性能是由于形成了更致密、更稳定的Cr2O3和TiO2钝化膜，阻碍了Cl−的输运，增强了抗腐蚀机制。Al1涂层综合性能最佳，为设计耐蚀性能与力学性能平衡的含al HEAs提供了指导。

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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.