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Microstructure, mechanical properties and corrosion behaviour of Ti6Al4V/Al2O3 joints brazed with TiCuNi filler

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Abstract

Ti6Al4V and Al2O3 were successfully vacuum brazed at 980 °C using TiCuNi filler foil. The microstructure and the chemical composition of the interface were analysed by SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy), respectively. The hardness profile across the interface and the mechanical strength of joints were assessed by Vickers microhardness tests and shear tests, respectively. The fracture surfaces were analysed by SEM, EDS and XRD (X-ray diffraction). The corrosion behaviour of joints was evaluated by OCP (open circuit potential), potentiodynamic polarisation tests and EIS (electrochemical impedance spectroscopy). Brazing produced a layered interface, free of pores and cracks, essentially composed of α-Ti, Ti2(Cu,Ni) and TixOy. The shear strength of joints was 168 ± 13 MPa, and fracture occurred partially through the hardest zone of the interface (1261 HV0.01.), located in the vicinity of the Al2O3 sample, and partially through the ceramic sample. The brazed joint did not significantly affect the corrosion behaviour of Ti6Al4V.

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Funding

This work was supported by the Portuguese Foundation for Science and Technology (FCT), Portugal, under PTDC/CTM-CTM/31579/2017—POCI-01–0145-FEDER – 031579 – funded by FEDER funds through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI) and by national funds (PIDDAC) through FCT/MCTES.

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Authors and Affiliations

  1. CMEMS-UMinho – Center of MicroElectroMechanical Systems, Universidade do Minho, Campus de Azurém, 4800-058, Guimarães, Portugal

    A. C. Alves, A. M. P. Pinto & A. Guedes

  2. LABBELS – Associate Laboratory, Braga, Guimarães, Portugal

    A. C. Alves, A. M. P. Pinto & A. Guedes

  3. IBTN/Euro – European Branch of the Institute of Biomaterials, Tribocorrosion and Nanomedicine, Dept. Eng. Mecânica, Universidade do Minho, Azurém, 4800-058, Guimarães, Portugal

    A. C. Alves

  4. DEM-UMinho – Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal

    A. M. P. Pinto & A. Guedes

  5. DEMM – Department of Metallurgical and Materials Engineering, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal

    S. Simões

  6. LAETA/INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias, 4200-465, Porto, Portugal

    S. Simões

Authors
  1. A. C. Alves
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  4. A. Guedes
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Correspondence to A. C. Alves.

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Alves, A.C., Pinto, A.M.P., Simões, S. et al. Microstructure, mechanical properties and corrosion behaviour of Ti6Al4V/Al2O3 joints brazed with TiCuNi filler. Weld World 67, 513–524 (2023). https://doi.org/10.1007/s40194-022-01448-5

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