Corrosion Behavior of Ti6Al4V/Al2O3 Vacuum Brazed Joints with Ag-Cu Eutectic Filler

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Alves, AC (Author) FEUP; Ariza, E (Author) Other; Guedes, A (Author) Other

Journal

Title: Journal of Materials Engineering and Performance

ISSN: 1059-9495

Publisher: Springer Nature

Indexing

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Other information

Authenticus ID: P-018-406

DOI: 10.1007/s11665-025-10734-4

Abstract (EN): Ti6Al4V/Al2O3 vacuum brazed joints were successfully processed at 830 degrees C using Ag-Cu eutectic foil as filler alloy. Scanning electron microscopy and energy dispersive spectroscopy were used to characterize the brazed joints microstructure and chemical composition. Studies focusing the electrochemical behavior of the base Ti6Al4V alloy and of the brazed joints were performed in 3.5 wt.% of NaCl using open circuit potential, potentiodynamic polarization tests and electrochemical impedance spectroscopy. Polarization resistance tests were also performed through different immersion periods, up to eight days. Brazing produced a multilayered interface mainly composed of Cu-Ti intermetallics and (Ag). Bonding between the metal and ceramic parts of the joint was ensured by a Ti-Cu-Al-O layer formed adjacently to Al2O3 sample. The corrosion behavior of the brazed joint was dictated by the preferential dissolution of the CuTi2, Cu4Ti, Cu4Ti3, Cu2TiAl and (Cu) formed at the interface and was found to be inferior to that of Ti6Al4V.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10