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Characteristics of the Molten Pool Temperature Field and Its Influence on the Preparation of a Composite Coating on a Ti6Al4V Alloy in the Micro-Arc Oxidation Process

1
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2
National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
3
AECC Guizhou Liyang Aviation Power Co. Ltd., Guizhou 550007, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(2), 464; https://doi.org/10.3390/ma13020464
Received: 11 December 2019 / Revised: 14 January 2020 / Accepted: 15 January 2020 / Published: 18 January 2020
(This article belongs to the Section Thin Films and Interfaces)
In this study, the phase transition of secondary phase particles in a composite coating is used to estimate the temperature field of the molten pool on a Ti6Al4V alloy in the micro-arc oxidation (MAO) process. The behavior of the sparks and the molten pool during the MAO process was observed in real-time by a long-distance microscope. The microstructures and compositions of the composite coatings were studied by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The results revealed that, for the temperature field distribution range of the molten pool in the active period, the lower limit is 2123 K and the upper limit is not lower than 3683 K. The reason for the multiphase coexistence is that the high-temperature phase is retained by the rapid cooling effect of the electrolyte, and the low-temperature phase is formed due to secondary phase transformation during the long active time of the molten pool temperature field. The strengthening mechanism of the composite coating prepared by adding the secondary phase particles is elemental doping rather than particle enhancement. The secondary phase particles are able to enter the composite coating by adhering to the surface during the cooling process. The secondary phase particles will then be wrapped into the coating in the next active period. View Full-Text
Keywords: micro-arc oxidation; temperature field; molten pool; secondary phase particles; composite coating micro-arc oxidation; temperature field; molten pool; secondary phase particles; composite coating
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MDPI and ACS Style

Li, X.; Dong, C.; Zhao, Q.; Cheng, F. Characteristics of the Molten Pool Temperature Field and Its Influence on the Preparation of a Composite Coating on a Ti6Al4V Alloy in the Micro-Arc Oxidation Process. Materials 2020, 13, 464. https://doi.org/10.3390/ma13020464

AMA Style

Li X, Dong C, Zhao Q, Cheng F. Characteristics of the Molten Pool Temperature Field and Its Influence on the Preparation of a Composite Coating on a Ti6Al4V Alloy in the Micro-Arc Oxidation Process. Materials. 2020; 13(2):464. https://doi.org/10.3390/ma13020464

Chicago/Turabian Style

Li, Xinyi, Chaofang Dong, Qing Zhao, and Fasong Cheng. 2020. "Characteristics of the Molten Pool Temperature Field and Its Influence on the Preparation of a Composite Coating on a Ti6Al4V Alloy in the Micro-Arc Oxidation Process" Materials 13, no. 2: 464. https://doi.org/10.3390/ma13020464

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