Journal
CRYSTALS
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/cryst11070770
Keywords
Ti2AlNb alloy; TC4 alloy; diffusion bonding
Funding
- National Natural Science Foundation of China [51905055]
- Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0115]
- Fundamental Research Funds for the Central Universities Project [2020CDJ-LHZZ-086]
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In this study, the Ti2AlNb alloy was successfully bonded to the TC4 alloy using vacuum diffusion bonding with a Ti interlayer. The interfacial microstructure of the joint was characterized, and it was found that the bonding parameters influenced the formation of a lamellar alpha + beta dual-phase structure. Optimal bonding parameters were determined to achieve the maximum shear strength of 549 MPa at 950 degrees C for 30 minutes under a pressure of 10 MPa.
In this paper, the Ti2AlNb alloy was bonded to TC4 alloy using the vacuum diffusion bonding method with a Ti interlayer. The interfacial microstructure of the Ti2AlNb/Ti/TC4 joint was characterized. The relationship between the bonding parameters and the microstructure and mechanical property of the joints was explored. Results indicated that the interdiffusion of Nb and Al elements between the interlayer and substrates promoted the formation of the lamellar alpha + beta dual-phase structure in the joint. The bonding parameters determined the diffusion distance of Nb and Al elements, thus controlling the characteristics of the lamellar alpha + beta dual-phase structure. When the Ti2AlNb alloy and TC4 alloy were bonded at 950 degrees C for 30 min under a pressure of 10 MPa, the elemental diffusion in the bonding couple was sufficient and the joint possessed the maximum shear strength of 549 MPa.
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