纳米TiB_(2)对CoCrFeNiSi高熵合金涂层耐磨与耐蚀性能的影响  

Effect of Nano-TiB_(2)on Wear and Corrosion Resistance of CoCrFeNiSi High-entropy Alloy Coating

作　　者：张泽疆 李新梅[1] 朱春金 李航 杨定力 ZHANG Zejiang;LI Xinmei;ZHU Chunjin;LI Hang;YANG Dingli(School of Mechanical Engineering,Xinjiang University,Urumqi 830000,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830000

出　　处：《材料导报》2025年第3期187-195,共9页Materials Reports

基　　金：国家自然科学基金(52161017);新疆维吾尔自治区自然科学基金(2022D01C386)。

摘　　要：本工作在40Cr表面激光熔覆CoCrFeNiSi-xTiB_(2)(x=2.5%,5.0%,7.5%,10.0%,质量分数)高熵合金(High-entropy alloy,HEA)复合涂层,对涂层的物相、显微组织、硬度、摩擦磨损和电化学腐蚀性能进行分析,探讨纳米TiB_(2)陶瓷颗粒对HEA涂层的影响。结果表明,x=2.5%,5.0%,7.5%时涂层物相由双相FCC和BCC组成;x=10.0%时在两相的基础上生成硼化物CrB,涂层显微组织由等轴晶转变为典型的柱状树枝晶。涂层的显微硬度随纳米TiB_(2)颗粒的增多而提高,x=10.0%时涂层平均硬度达到最高,为HV547.11,约为基体的2.72倍,其硬度提升的主要原因是固溶强化和弥散强化。随TiB_(2)含量的增加,复合涂层的磨损量明显减少,x=10.0%时磨损失重量仅为0.13 mg。总体来看,TiB_(2)含量的增加使复合涂层的主要磨损机制从严重磨粒磨损、氧化磨损转变成轻微磨粒磨损、氧化磨损,耐磨性能明显提高。在3.5%NaCl溶液中,x=7.5%时复合涂层的耐蚀性能最佳。CoCrFeNiSi-xTiB_2(x=2.5%,5.0%,7.5%,10.0%,in weight percentage)high-entropy alloy(HEA)composite coatings were laser clad on 40Cr surface.The phase,microstructure,hardness,friction wear,and electrochemical corrosion properties of the coatings were analyzed,and the influence of nano-TIB_(2)ceramic particles on the HEA coating was discussed.The results showed that when x=2.5%,5.0%,7.5%,the coating phases were composed of biphase FCC and BCC,and when x=10.0%,boride CrB was formed on the basis of the two phases,and the microstructure changed from equiaxial crystals to typical columnar dendrites.The microhardness of the coating increased with the increase of nano-TiB_(2)particles.When x=10.0%,the average hardness of the coating reached its maximum value of HV547.11,about 2.72 times higher than that of the substrate.The hardness increase could be ascribed mainly to solid solution strengthening and dispersion strengthening.With the increase of TiB_(2)content,the wear loss of the composite coating decreased significantly,and the wear loss was only 0.13 mg by adopting an x value of 10.0%.In general,the increasing addition of TiB_(2)results in the conversion of main wear mechanism of the composite coating from severe abrasive wear and oxidation wear into slight abrasive wear and oxidation wear,and an obviously improved wear resistance.In 3.5%NaCl solution,the composite coating with x=7.5%achieved the best wear resistance.

关 键 词：高熵合金(HEA) 激光熔覆 纳米陶瓷 耐磨性 耐腐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]