Microstructure and properties of TC4 titanium alloy micro-arc oxide composite coating based on laser surface texturing
Abstract Micro-arc oxidation technology is one of the important means to improve the tribological properties of titanium alloys, but the bonding performance between the micro-arc oxidation film and the substrate material limits the further application of the micro-arc oxidation film. This study inve...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-03-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-89056-3 |
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| Summary: | Abstract Micro-arc oxidation technology is one of the important means to improve the tribological properties of titanium alloys, but the bonding performance between the micro-arc oxidation film and the substrate material limits the further application of the micro-arc oxidation film. This study investigates TC4 titanium alloy as a model system, the microstructure and properties of the composite coating were obtained by laser surface texturing composite micro-arc oxidation process. The microstructure, phase composition, and worn morphology of the Micro-arc oxidation coating were characterized using X-ray diffraction, field emission scanning electron microscopy, and optical microscopy, respectively. Mechanical properties, including hardness, friction coefficient, and adhesion strength, were assessed using microhardness tester, Bruker tribometer, and micro/nano scratch tester, respectively. Results revealed that the Micro-arc oxidation coatings predominantly consist of Rutile TiO₂ and Anatase TiO₂ phases. The coating thickness in the mixed electrolyte reached up to 23.82 μm, with a maximum hardness of 467.56 HV₀.₅. Additionally, the friction coefficient of the laser-textured Micro-arc oxidation coatings decreased to 0.3. Laser surface texturing significantly enhanced the adhesion strength between the coating and substrate while simultaneously improving the tribological performance. |
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| ISSN: | 2045-2322 |