冷喷涂辅助感应重熔合成AlCo x CrFeNiCu高熵合金涂层的显微组织和性能

doi:10.11900/0412.1961.2021.00285

金属学报

2023, Vol. 59

Issue (5): 703-712 DOI: 10.11900/0412.1961.2021.00285

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冷喷涂辅助感应重熔合成AlCo _x CrFeNiCu高熵合金涂层的显微组织和性能

冯力¹^,²(

), 王贵平¹, 马凯¹, 杨伟杰¹, 安国升¹^,², 李文生¹^,²

¹兰州理工大学材料科学与工程学院兰州 730050
²兰州理工大学有色金属先进加工与再利用国家重点实验室兰州 730050

Microstructure and Properties of AlCo _x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting

FENG Li¹^,²(

), WANG Guiping¹, MA Kai¹, YANG Weijie¹, AN Guosheng¹^,², LI Wensheng¹^,²

¹College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
²State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

引用本文:

冯力, 王贵平, 马凯, 杨伟杰, 安国升, 李文生. 冷喷涂辅助感应重熔合成AlCo _x CrFeNiCu高熵合金涂层的显微组织和性能[J]. 金属学报, 2023, 59(5): 703-712.
Li FENG, Guiping WANG, Kai MA, Weijie YANG, Guosheng AN, Wensheng LI. Microstructure and Properties of AlCo _x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting[J]. Acta Metall Sin, 2023, 59(5): 703-712.

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摘要:

通过冷喷涂辅助感应重熔技术在45钢基体成功制备AlCo _x CrFeNiCu (x = 0、0.5、1.0、1.5、2.0，摩尔分数)高熵合金涂层。研究了Co元素含量对冷喷涂辅助合成高熵合金涂层物相、微观组织的影响。结果表明：通过低压冷喷涂辅助感应重熔技术合成的AlCo _x CrFeNiCu高熵合金涂层由fcc + bcc双相混合结构组成，涂层组织为等轴树枝晶+晶间组织，其中枝晶为bcc结构，晶间组织为fcc结构。Co含量的变化会引起AlCo _x CrFeNiCu高熵合金涂层的晶格畸变状态发生变化，当x = 1.0时，AlCo₁CrFeNiCu高熵合金涂层的晶格应变最大。Co元素含量增加会促进AlCo _x CrFeNiCu高熵合金涂层中的枝晶数目增加，同时涂层中的树枝晶尺寸也随着Co元素含量增加而增大。涂层中的树枝晶富集Fe、Cr、Co、Ni元素，枝晶间富集Cu元素，Al均匀地分布在整个涂层中。随着Co含量增加，AlCo _x CrFeNiCu高熵合金涂层的硬度先增加后减小；当x = 1.0时，AlCo₁CrFeNiCu高熵合金涂层的硬度达到562.5 HV，此时涂层的摩擦系数最小，为0.352。

关键词 ：冷喷涂, 感应重熔, 高熵合金涂层, 摩擦磨损

Abstract：

High-entropy alloy coatings have a very wide range of industrial applications due to their outstanding mechanical properties and good wear resistance. High-entropy alloy coatings of AlCo _x CrFeNiCu (x = 0, 0.5, 1.0, 1.5, 2.0, mole fraction) on 45 steel substrates were successfully produced by cold spraying assisted induction remelting approach. The effect of Co content on the phase and microstructure of cold spraying-assisted high-entropy alloy coating was investigated. The findings reveal that the AlCo _x -CrFeNiCu high-entropy alloy coating produced using low-pressure cold spraying assisted induction remelting technique comprises of fcc + bcc two-phase mixed structure, with an equiaxed dendrite + interdendritic structure, with the dendrite being bcc and the interdendritic structure being fcc. The lattice distortion state of AlCo _x CrFeNiCu high-entropy alloy coating changes as the Co element changes; when x = 1.0, the lattice strain of AlCo₁CrFeNiCu high-entropy alloy coating is the largest. Increases in Co content promote an increase in dendrite number in AlCo _x CrFeNiCu high-entropy alloy coatings, as well as dendrite. The EDS analysis demonstrated that Fe, Cr, Co, and Ni were enriched in the dendrite, Cu was enriched in the interdendrite, and Al was evenly distributed throughout the coating. With an increase in Co content, the hardness of AlCo _x CrFeNiCu high-entropy alloy coating increases first and then decreases. When x = 1.0, the hardness of the AlCo₁CrFeNiCu high-entropy alloy coating is 562.5 HV, and the coating minimum's friction coefficient is 0.352.

Key words： cold spraying induction remelting high-entropy alloy coating friction and wear

收稿日期: 2021-07-12

ZTFLH:

TG146

基金资助:国家自然科学基金项目(52075234);国家重点研发计划项目(2016YFE0111400)

作者简介: 冯力，男，1981年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00285 或 https://www.ams.org.cn/CN/Y2023/V59/I5/703

表1 感应重熔合成高熵合金涂层各元素的含量 (mass fraction / %)

图1 冷喷涂AlCo x CrFeNiCu预制合金粉体涂层横截面形貌的SEM像

图2 感应重熔AlCo x CrFeNiCu高熵合金涂层的XRD谱

表2 AlCo x CrFeNiCu高熵合金涂层各相的晶格常数 (nm)

图3 感应重熔AlCo x CrFeNiCu高熵合金表面形貌的SEM像

图4 AlCo1CrFeNiCu高熵合金涂层的TEM分析

图5 感应重熔AlCo1CrFeNiCu高熵合金涂层截面SEM像、表面SEM像和EDS

图6 AlCo x CrFeNiCu高熵合金涂层中fcc和bcc相晶格应变(εfcc和εbcc)随原子尺寸差异(δ)的变化

图7 AlCo x CrFeNiCu高熵合金涂层和45钢基体的硬度和摩擦系数

图8 AlCo x CrFeNiCu高熵合金涂层的平均磨损率和摩擦系数

图9 AlCo x CrFeNiCu高熵合金涂层磨损形貌的SEM像

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