The Influence of Ti-6-4 Alloy Interlayer on Ti3Al Alloy DB Quality and Interface Mechanical Properties

Abstract:

Ti₃Al intermetallic alloy is a light and high-temperature resistant material which substitutes for superalloy. It is promising for wide use in aerospace yield. In this paper, the Ti₃Al alloy was joined by diffusion bonding with and without Ti-6-4 alloy interlayer respectively. Diffusion bonding quality and shear strength of the joints were measured and compared. The results show that there was almost no defect found in joints with interlayer and maximum shear strength is 523 MPa in conditions of 940°C and 2.5 MPa pressure for 1.5h. In contrast, defect rate (percentages of sum of defects length in optical micrograph) of joints without interlayer exceeds 80% and maximum shear strength is only 150 MPa in same conditions. According to fracture analysis, the ductile fracture occurred at Ti-6-4 interlayer of joint with interlayer. Fracture of joint without interlayer belongs to mixed type of ductile fracture and brittle fracture.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 586-591
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.586
• Online since: January 2016
• Authors: Hui Yuan Xu*, Ming Jie Fu, Xiu Quan Han, Jie Shao, Zhi Qiang Li
• Keywords: Diffusion Bonding, Interlayer, Mechanical Properties, Ti₃Al, Ti-6-4 Alloy

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