1. Microstructure and properties of TiVNbTa/Inconel 600 diffusion welded joint
- Author
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LI Juan, SHEN Kuanchun, YIN Rong, ZHAO Honglong, LUO Shaomin, ZHOU Nian, and QIN Qingdong
- Subjects
diffusion welding ,refractory high entropy alloy ,superalloy ,microstructure ,mechanical property ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
In view of the excellent corrosion resistance and high temperature strength of TiVNbTa refractory high entropy alloy, and the potential application prospect of the TiVNbTa RHEA/Inconel 600 joining component, the diffusion bonding properties were studied. Diffusion joining of the two materials under conditions ranging from 850 ℃ to 1150 ℃ were carried out, the joints achieved at 850~1000 ℃ were submitted for microstructure examining, and the joints joined at all temperatures were used for shearing test. The results indicate that except for the joints obtained at 850 ℃, which only contain a lot of Ni-rich interface layers, all other joints have a multi-layer interface structure of "Inconel 600/Ni-based diffusion layer/Cr-rich layer/Ti-rich layer/Ni-rich layer/TiVNbTaNi (Fe, Cr) diffusion layer/TiVNbTa RHEA". The Ni-rich layer is a Ni2Ti type intermetallic compound with rhombohedral crystal structure, and the Cr-rich layer is a Cr2X type intermetallic compound with hexagonal crystal structure. The joint achieved at 950 ℃ has the highest shear strength, which is 357 MPa. The fracture mainly occurs in the weak interfacial area of Ni2Ti in the joint, and the crack propagates through the multi-layer interface. The analysis of the joints formation mechanism shows that during the diffusion joining process, Ti, V, Nb, and Ta atoms diffuse from the RHEA side to the Inconel 600 side, while Ni, Fe, and Cr atoms diffuse from the Inconel 600 side to the RHEA side. The diffusion of Ti and Ni atoms is intense. The segregation of Cr and Ni elements occurs under the driving source of interfacial chemical reactions. The diffusion of Nb and Ta atoms is hindered by the formation of Ni2Ti type interfacial layers, resulting in delamination. more...
- Published
- 2024
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