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冷喷涂辅助原位合成FeCoxCrAlCu高熵合金涂层组织性能研究
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兰州理工大学材料科学与工程学院

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国家重点研发计划(2016YFE0111400);甘肃省重点研究项目(17YF1WA159);中国博士后科学(2018-63-200618-34)


The organization and performance of cold spray-assisted in-situ synthesis of FeCoxCrAlCu high entropy alloy coating
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College of Material Science and Technology,Lanzhou University of Technology

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    摘要:

    利用冷喷涂辅助原位合成高熵合金涂层的方法,在45#钢基体表面成功制备出不同Co含量的FeCoxCrAlCu(x=0,0.5,1,1.5,2)高熵合金涂层。通过XRD、SEM、EDS、TEM、显微硬度计、磨料磨损试验机、电化学工作站等设备,检测分析了Co含量的变化对合金涂层相结构、显微组织,硬度、耐磨性及耐腐蚀性的影响。结果表明:合金涂层是由简单的FCC+BCC双相混合结构组成,Co含量的改变对涂层相组织的数量影响不大;随着Co含量的增加,合金涂层中显微组织的枝晶数目增加,并且得到明显粗化,通过面扫得显微组织中枝晶内富集Fe,Cr,Co元素,枝晶间富集Cu元素,Al均匀的分布在整个涂层中;随着Co含量的增加,硬度先增加后减小,在Co=1时合金涂层硬度达到最大为555.6HV;合金涂层中最小的摩擦系数为0.361;在3.5wt.%NaCl腐蚀介质中,合金涂层相比与45#钢基体具有较正的自腐蚀电位(Ecorr=-0.325V),说明涂层耐腐蚀性比基体好。

    Abstract:

    The high entropy alloy coating was successfully prepared on the surface of 45# steel matrix by cold spray assisted in situ synthesis of FeCoxCrAlCu (x =0,0.5,1,1.5,2) high entropy alloy coating. The effects of Co content on phase structure, microstructure, hardness, wear resistance and corrosion resistance of alloy coating were analyzed by XRD,SEM,EDS,TEM, microhardness meter, abrasive wear testing machine, electrochemical workstation and so on. The results show that the alloy coating was composed of simple FCC+BCC two phase mixed structure, and the change of Co content has little influence on the amount of phase structure of the coating.With the increase of Co content, the number of dendrites in the microstructure of the alloy coating increased and got obvious coarsening.The number of crystals had increased, and it had been significantly coarsened. The microstructure was enriched with Fe, Cr, Co in the dendrites, and Cu was enriched between the dendrites, and Al was evenly distributed in the entire coating.With the increase of Co content, the hardness first increased and then decreased. When Co=1, the hardness of the alloy coating reached a maximum of 555.6HV.The minimum friction coefficient in the alloy coating is 0.361.In 3.5wt.%NaCl corrosive medium, the alloy coating had a positive self-corrosion potential compared with the 45# steel substrate (Ecorr=-0.325V), indicating that the coating had better corrosion resistance than the substrate.

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冯力,王军,王贵平,马凯,安国升,李文生.冷喷涂辅助原位合成FeCoxCrAlCu高熵合金涂层组织性能研究[J].稀有金属材料与工程,2021,50(11):3987~3994.[Feng Li, Wang Jun, Wang Guiping, MaKai, An Guosheng, Li Wensheng. The organization and performance of cold spray-assisted in-situ synthesis of FeCoxCrAlCu high entropy alloy coating[J]. Rare Metal Materials and Engineering,2021,50(11):3987~3994.]
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  • 收稿日期:2020-11-09
  • 最后修改日期:2020-12-02
  • 录用日期:2020-12-23
  • 在线发布日期: 2021-11-30
  • 出版日期: 2021-11-24