Preparation and Microstructure of Diffused Ti-Al-Si Coatings on Ti-6Al-4V Alloy

doi:10.11902/1005.4537.2024.239

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 69-80 DOI: 10.11902/1005.4537.2024.239

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Preparation and Microstructure of Diffused Ti-Al-Si Coatings on Ti-6Al-4V Alloy

LIU Guoqiang¹, FENG Changjie², XIN Li¹(

), MA Tianyu¹^,³, CHANG Hao¹, PAN Yuxuan¹, ZHU Shenglong¹

1 Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science & Engineering, Shenyang Aerospace University, Shenyang 110136, China
3 School of Materials Science &Engineering, Northeastern University, Shenyang 110819, China

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LIU Guoqiang, FENG Changjie, XIN Li, MA Tianyu, CHANG Hao, PAN Yuxuan, ZHU Shenglong. Preparation and Microstructure of Diffused Ti-Al-Si Coatings on Ti-6Al-4V Alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 69-80.

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Abstract

Al-Si coatings with different Si content were deposited on the surface of Ti-6Al-4V alloy by multi-arc ion plating, then vacuum annealing treatment of the coated alloy were carried out at different temperatures in the range 600~900 ^oC. Finally, diffused Ti-Al-(Si) coatings of different microstructure were obtained. The results showed that the diffused coatings obtained by annealing at 650 ^oC were single layer coatings mainly composed of TiAl₃. Si substituted for Al atoms in the TiAl₃ lattice and formed Ti(Al, Si)₃ solid solution. When the Si content in the coating exceeded 15% (atomic fraction), the solid solubility limit of Si in TiAl₃ lattice, Ti-Al-Si ternary compounds precipitated, forming multi-phase coating with Ti(Al, Si)₃. Penetrating cracks formed for all the single layer coatings. The diffused coatings obtained by annealing at 800 ^oC and 900 ℃ exhibited a multilayered structure, where, the outmost layer was mainly composed of TiAl₃ and Si was dissolved in the TiAl₃. When the Si content was high in the coatings, Ti-Si binary and/or Ti-Al-Si ternary compounds precipitated and the amount of the precipitates increased with the increasing of annealing temperature. Intermediate layers between the TiAl₃ layer and the Ti-alloy substrate were composed of one or two of the TiAl₂, TiAl, Ti₃Al, Ti₅Si₃ and Ti₅Si₄ layers. The multilayered structure can obviously suppress the formation of penetrating cracks on the diffused Ti-Al-Si coatings.

Key words: Si modified aluminide coating Ti-alloy vacuum annealing treatment diffusion microstructure

Received: 01 August 2024 32134.14.1005.4537.2024.239

ZTFLH:

TG174.4

Fund: National Natural Science Foundation of China(52371085);Liaoning Revitalization Talents Program(XLYC2002031)

Corresponding Authors: XIN Li, E-mail: xli@imr.ac.cn

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	LIU Guoqiang
	FENG Changjie
	XIN Li
	MA Tianyu
	CHANG Hao
	PAN Yuxuan
	ZHU Shenglong

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.239 OR https://www.jcscp.org/EN/Y2025/V45/I1/69

Fig.1 XRD pattern of 25.7Si coated Ti-6Al-4V after vacuum annealing at 600 ^oC for 7 h

Fig.2 SEM surface (a, b) and cross-sectional (c, d) morphologies of 25.7Si coated Ti-6Al-4V before (a, c) and after (b, d) vacuum annealing at 600 ^oC for 7 h

Table 1 EDS analysis results of the zones marked by 1-6 in Fig.2

Fig.3 Calculated isothermal section of Ti-Al-Si system at 600 ^oC

Fig.4 XRD patterns of 0Si-650, 5.2Si-650, 12.5Si-650 and 25.7Si-650 coatings

Fig.5 Surface (a-d) and cross-sectional (e-h) morphologies and EDS elemental line scanning results for 0Si-650 (a, e), 5.2Si-650 (b, f), 12.5Si-650 (c, g) and 25.7Si-650 (d, h) coatings

Table 2 EDS determined compositions of the zones marked by 1-9 in Fig.5

Fig.6 Calculated isothermal section of Ti-Al-Si system at 650 ^oC

Fig.7 XRD patterns of 0Si-800, 5.2Si-800, 12.5Si-800 and 25.7Si-800 coatings

Fig.8 Surface (a-d) and cross-sectional (e-h) morphologies and EDS elemental line scanning results for 0Si-800 (a, e), 5.2Si-800 (b, f), 12.5Si-800 (c, g) and 25.7Si-800 (d, h) coatings

Table 3 EDS determined compositions of the zones marked by 1-16 in Fig.8

Fig.9 Calculated isothermal section of Ti-Al-Si system at 800 ^oC

Fig.10 XRD patterns of 0Si-900, 5.2Si-900, 12.5Si-900and 25.7Si-900 coatings

Fig.11 Surface (a-d) and cross-sectional (e-h) morphologies and EDS elemental maps for 0Si-900 (a, e), 5.2Si-900 (b, f), 12.5Si-900 (c, g) and 25.7Si-900 (d, h) coatings

Table 4 EDS determined compositions of the zones mark-ed by 1-17 in Fig.11 (atomic fraction / %)

Fig.12 Calculated isothermal section of Ti-Al-Si system at 900 ^oC

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