| FENG Li,MA Kai,YANG Wei-jie,WANG Ning,YUAN Yu-dong,LI Wen-sheng.Microstructure and Properties of CuNiCoFeCrAl2.3 High Entropy Alloy Coating Prepared by Cold Spray Assisted in Situ Synthesis[J],51(10):344-352 |
| Microstructure and Properties of CuNiCoFeCrAl2.3 High Entropy Alloy Coating Prepared by Cold Spray Assisted in Situ Synthesis |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.037 |
| KeyWord:high entropy alloy cold spray induction remelting microstructure wear resistance |
| Author | Institution |
| FENG Li |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology, Lanzhou , China |
| MA Kai |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China |
| YANG Wei-jie |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China |
| WANG Ning |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China |
| YUAN Yu-dong |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China |
| LI Wen-sheng |
College of Material Science and Technology, Lanzhou University of Technology, Lanzhou , China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology, Lanzhou , China |
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| Abstract: |
| In recent years, the rapid development of material surface treatment technology plays a particularly important role in the progress of modern science and technology, industry and economic development. Surface treatment technology is an important method to improve and repair matrix materials. It can improve the strength, hardness, wear resistance and corrosion resistance of materials. Preparing a layer of alloy coating on the surface of ordinary industrial materials is one of the most effective measures of surface treatment. high entropy alloy coating assisted in situ synthesis by cold spraying was prepared，This method can effectively eliminate the interface between powder particles in cold spraying coating. Improve the adhesion and cohesion of the coating, The adhesion of the coating can reach 120 Mpa. In this method, the high entropy alloy powder is not required to be prefabricated, and the mixed metal powder is used as the spraying material to prepare the prefabricated mixed metal coating on the substrate. High entropy alloy coating was synthesized in situ by induction remelting technique. Therefore, this method has the advantages of low preparation cost, short cycle and easy to adjust the composition of the coating. High entropy alloys have high entropy effect in thermodynamics, lattice distortion effect in structure, hysteresis diffusion effect in dynamics, "cocktail" effect in performance and stability in structure. These effects give the alloys excellent mechanical properties such as high strength, good corrosion resistance and excellent wear resistance. These new metal materials are suitable for many engineering applications, Scholars prepared high entropy alloy as surface coating for wear and corrosion conditions, which can not only improve the service life and performance of metal parts, but also reduce the cost of preparation. In order to improve the surface corrosion and wear resistance of ordinary metal materials, a technology for preparing CuNiCoFeCrAl2.3 high entropy alloy coating with good performance on the surface of common metal materials was proposed. Methods The mixed metal coating was prepared on 45# steel by cold spraying at low pressure, and then synthesized into CuNiCoFeCrAl2.3 high entropy alloy coating by induction remelting technology. The phase composition, microstructure, hardness and wear resistance of the coating were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD)、energy dispersive spectrometer (EDS)、microhardness tester and abrasive wear tester. Results The microstructure of CuNiCoFeCrAl2.3 high entropy alloy coating was compact, the elements were uniformly distributed, the alloy coating was composed of simple BCC phase, and the microstructure of the coating showed typical dendrite structure. Co、Cr、Fe and Ni are mainly abundant in the inner dendrite region, while Cu and Al are abundant in the inter-dendrite region. The microhardness of CuNiCoFeCrAl2.3 high entropy alloy coating is three times that of 45# steel alloy matrix under dry friction condition. The wear rate of CuNiCoFeCrAl2.3 high entropy alloy coating under dry sliding condition is 59% lower than that of 45# steel substrate, and the friction coefficient is 0.38. the wear rate of CuNiCoFeCrAl2.3 high entropy alloy coating is 2.95×10‒5 mm3/(N·m). The CuNiCoFeCrAl2.3 high entropy alloy coating assisted by cold spraying has high hardness and excellent wear resistance. |
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