Microstructure of Al2O3/Ti-Al Composite Coatings Prepared by Laser Aluminum Thermal Reduction Processing

doi:10.3724/SP.J.1077.2013.12730

Abstract

Abstract: With composite powders of Al and TiO₂ systems as reactants, Al₂O₃ reinforced Ti-Al matrix intermetallic composite coatings were prepared on the TC4 alloy substrate by laser in-situ synthesis processing. The effects of laser power, laser scanning speed and laser spot size on laser energy density were analyzed, respectively. The macroscopic morphology, cross-section microstructure, and micro-hardness of Al₂O₃/Ti-Al composite coatings were characterized by optical microscope (OM), X-ray diffraction (XRD), energy dispersive spectroscope (EDS) and micro-hardness tester. The results show that scanning speed has the greatest impact on laser energy density firstly, then the laser spot size, and then the weakest is laser power. With the scanning speed increases, Al₂O₃/Ti-Al composite coatings surface become rougher, “fish-scale shape” morphology are more obvious, and the thickness of bonding-zone decreases. The reinforced phase of composite coating is composed of k-Al₂O₃ and α-Al₂O₃, while the matrix phase is composed of α-Ti and α₂-Ti₃Al. And with the increase of laser scanning speed, k-Al₂O₃changes into α-Al₂O₃ partially. The morphology of Al₂O₃ reinforcement tends to change from dendrite shape to fiber. The micro-hardness of samples has a smooth transition tendency from the substrate to the coating surface. The micro-hardness distribution of coating cross section is uniform, and the average micro-hardness is significantly higher than that of the substrate.

Key words: laser cladding, in-situ synthesis, aluminothermic reduction, Al₂O₃/Ti-Al composite coating, TC4 alloy

CLC Number:

TB333

ZHANG Xiao-Wei, LIU Hong-Xi, JIANG Ye-Hua, PHAM THI Hong-Nga. Microstructure of Al₂O₃/Ti-Al Composite Coatings Prepared by Laser Aluminum Thermal Reduction Processing[J]. Journal of Inorganic Materials, 2013, 28(9): 1033-1039.

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Microstructure of Al₂O₃/Ti-Al Composite Coatings Prepared by Laser Aluminum Thermal Reduction Processing

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