Microstructure evolution and diffusion mechanism of Nb/TiAl alloy diffusion-bonded joints

被引：5
作者：
Huang, Kun [1 ,2 ]
Sun, Hong-Liang [1 ,2 ]
Huang, Ze-Wen [1 ,2 ]
Liao, Mo-Yu [1 ,2 ]
Li, Yang [1 ,2 ]
机构：
[1] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Peoples R China
[2] Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Peoples R China
来源：
RARE METALS | 2023年 / 42卷 / 05期
基金：
国家重点研发计划;
关键词：
Diffusion bonding; TiAl alloys; Nb; Interface microstructure; Interdiffusion coefficient; TERNARY INTERDIFFUSION COEFFICIENTS; HIGH-NB; OXIDATION BEHAVIOR; O-PHASE; AL; DEFORMATION; TITANIUM; TI2ALNB; NIOBIUM; BINARY;
D O I：
10.1007/s12598-018-1125-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The interdiffusion behavior in Nb/TiAl alloy diffusion couples was studied. The process was carried out in the temperature range of 950-1400 degrees C for 8 h in the vacuum hot-pressure sintering furnace. The microstructural evolution was observed by optical microscopy (OM), electron backscattered diffraction (EBSD), X-ray diffraction (XRD) technique and transmission electron microscopy (TEM). The element concentration distribution at the bonded interface was obtained by scanning electron microscopy with an energy-dispersive X-ray spectroscopy (EDS) apparatus. The thickness of reaction interface increases with bonding temperature increasing. The formed phases in diffusion interface are found to be O-Ti2AlNb, sigma-Nb2Al, delta-Nb3Al and Nb solid solution (Nbss) at 1350 degrees C. The average interdiffusion coefficient of the interface elements was calculated by the theory of Dayananda. The results indicate that Al diffuses faster than Nb and Nb diffuses faster than Ti in the Ti-Al-Nb system. Meanwhile, it is found that Ti promotes the diffusion of Al and Nb and Nb inhibits the diffusion of Ti and Al in the process of diffusion.
引用
收藏
页码：1686 / 1694
页数：9
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