Interfacial diffusion reactions and mechanical properties of Ti3Al/Ni-based superalloy joints brazed with AgCuPd filler metal

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.07.024· OSTI ID:22805796

Ren, H. S.; Long, W. M.; Shen, Y. X. ^[1]; Pang, S. J. ^[2]; Chen, B.; Cheng, Y. Y. ^[3]

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1. State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001 (China)
2. Department of Material Science and Engineering, Beihang University, Beijing 100191 (China)
3. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, Beijing 100095 (China)

Highlights: • Ti{sub 3}Al alloy to Ni-based superalloy was successfully brazed using Ag-21Cu-25Pd filler metal. • Phases TiPd (fcc), Ti{sub 3}Pd{sub 5} (bct) and AlPd (hcp) formed within the Ti{sub 3}Al/Ni-based superalloy joint. • Diffusion behavior of elements and its influence on joint interfacial microstructure were revealed. • A formation model of interfacial microstructure has been established. • The joint tensile strength at room temperature reached 404MPa, and the strength of 212MPa was maintained at 773 K. - Abstract: Dissimilar joining of a Ti{sub 3}Al-based alloy to a Ni-based superalloy has been conducted using Ag-21Cu-25Pd filler metal. The joint microstructures were analyzed using SEM, EPMA, XRD and TEM. The reaction behaviors between different elements were discussed. Due to the strong affinity, element Pd mainly reacted with Ti{sub 3}Al substrate and formed intermetallic compounds of TiPd, Ti{sub 3}Pd{sub 5} and AlPd. Elements Ni and Ti reacted with each other and caused the formation of Ni{sub 3}Ti in the centre of the joint. Owing to the diffusion effect, element Ag was enriched in the joint central area as (Ag,Cu){sub ss}. With the prolonging of the brazing time varying from 3 min to 15 min at 1253 K, the tensile strength of the joint firstly increased and then decreased. The joints brazed at 1253 K for 10 min presented the maximum strength of 404 MPa at room temperature, and the joint strength of 212 MPa was maintained at 773 K. The total fracture surface covered the most of the reaction zones from the (Ag,Cu){sub ss} to the diffusion effect zone at the Ti{sub 3}Al side.

• OSTI ID: 22805796
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 144; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
BINARY ALLOY SYSTEMS
BRAZING
COPPER COMPOUNDS
DIFFUSION
ELECTRON MICROPROBE ANALYSIS
FILLER METALS
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NICKEL BASE ALLOYS
PALLADIUM COMPOUNDS
PRESSURE RANGE MEGA PA 100-1000
SCANNING ELECTRON MICROSCOPY
SILVER COMPOUNDS
SUBSTRATES
SURFACES
TENSILE PROPERTIES
TITANIUM COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION