激光熔覆TiC x 增强钛基复合涂层组织与增强相第一性原理研究

doi:10.7527/S1000-6893.2022.27294

Abstract

Abstract:

Titanium carbide （TiC _x ） reinforced titanium matrix composite coating was synthesized in situ by coaxial powder feeding laser cladding technology. X-ray diffraction， scanning electron microscope， energy dispersive spectrometer， microhardness tester， and other characterization and testing methods were used. Combined with first principles， the intrinsic relationship between the addition of NiCr-Cr₃C₂， and the microstructure and microhardness of the composite coating was studied. Moreover， the influence of C/Ti atomic ratio on the mechanical properties and thermodynamic stability of TiC _x was explored. The results showed that the microstructure of the composite coating is mainly composed of β-Ti ordered solid solution （matrix phase） and TiC _x （reinforcing phase）. The addition of NiCr-Cr₃C₂ has significant effect on the quantity， scale and morphological characteristics of titanium carbide in the composite coating， and the microstructure of titanium carbide in the upper and lower areas of the composite coating is significantly different. The C/Ti atomic ratio of TiC _x is highly correlated with its morphology. TiC _x in composite coating mainly includes irregular TiC_0.2-0.4， dendritic TiC_0.4-0.6， petal TiC_0.6-0.8， and spherical TiC_0.8-1.0. In addition， with the increase of the addition of NiCr-Cr₃C₂， the hardness of the composite coating increased significantly， which is mainly due to the formation of more TiC _x， the increase of C content in TiC _x and the more remarkable solid solution strengthening effect. First-principles analysis showed that with the increase of C/Ti atomic ratio， the bulk modulus， shear modulus， tensile modulus， and hardness of TiC _x increased significantly， while Poisson’s ratio decreased gradually. In addition， with the increase of C atom content in TiC _x， its metallicity decreases and its brittleness increases， but its crystal structure and thermodynamic stability significantly increase.

Key words: laser cladding, TiC _x, non-stoichiometric compounds, first-principles calculations, mechanical property

CLC Number:

V252.2

Zhiqiang ZHANG, Ziming YU, Tiangang ZHANG, Qian YANG, Hao WANG. Microstructure of TiC _x reinforced Ti-based composite coating prepared by laser cladding and first principle study on reinforced phase[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(8): 427294-427294.

Figures/Tables 12

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参数类型	数值
功率/W	1 500
扫描速度/（m·s^-1）	6
送粉速率/（r·min^-1）	0.6
光斑直径/mm	2.5
搭接率/%	50

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Microstructure of TiC _x reinforced Ti-based composite coating prepared by laser cladding and first principle study on reinforced phase

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Microstructure of TiC x reinforced Ti-based composite coating prepared by laser cladding and first principle study on reinforced phase

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Microstructure of TiC _x reinforced Ti-based composite coating prepared by laser cladding and first principle study on reinforced phase