Formation process of the bonding joint in Ti/Al diffusion bonding

The process of the formation of Ti/Al diffusion bonding joints was studied by means of scanning electron microscopy (SEM), X-ray diffractometry (XRD) and shear strength measurement. Pure titanium and pure aluminum were used as bonding couples. The results show that the process of joint formation can...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-05, Vol.480 (1), p.456-463
Main Authors: Wei, Yao, Aiping, Wu, Guisheng, Zou, Jialie, Ren
Format: Article
Language:English
Subjects:
Applied sciences
Diffusion bonding
Diffusion reaction
Exact sciences and technology
Fractures
Interface structure
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Welding
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Summary:The process of the formation of Ti/Al diffusion bonding joints was studied by means of scanning electron microscopy (SEM), X-ray diffractometry (XRD) and shear strength measurement. Pure titanium and pure aluminum were used as bonding couples. The results show that the process of joint formation can be separated into four stages, and the product of the diffusion reaction is only TiAl 3 under a particular range of holding time. There is a delay time t D before TiAl 3 is generated, which is mainly affected by temperature. The joint strength depends on the metallurgical combination percentage and the interface structure in the diffusion zone, and it can reach or even exceed the strength of pure aluminum after TiAl 3 forms a layer. The position where shear fracture occurs depends on interface structure in the diffusion zone.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.07.027