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Interfacial processes during diffusion welding of titanium alloy/aluminium couples under ambient atmosphere

  • M. Kamal KarfoulEmail author
  • Gordon J. Tatlock
Research Paper

Abstract

In this study, it is reported that the diffusion welding of α-titanium and (α + β) titanium alloys with aluminium has been carried out by applying sufficient compression to the welded samples to give a high level of plastic deformation in the Al layers sandwiched between layers of titanium alloy with a moderate surface finish. Both metals are active in the air; such diffusion processes can take place under vacuum. However, we report, that high-quality welds were achieved at temperatures between 610 and 630 °C under ambient air atmosphere, without the use of vacuum or reducing atmospheres. The resulting microstructures and intermetallic phases were characterised using scanning and transmission electron microscopy and EDX microanalysis. This showed that under the welding parameters selected, Ti diffused across the interface into Al and Al into Ti, since the protective Al2O3 thin film on the surface of aluminium layer has been disrupted due to the Al layer plastic deformation. Impact tests of welds gave relatively high energy impact values.

Keywords

Diffusion welding Ti alloys Al alloys Microstructures Interface Intermetallics 

Notes

Acknowledgements

The authors thank members of the Materials Science Laboratory at the University of Liverpool for their help and support.

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Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  1. 1.Faculty of Mechanical & Electrical EngineeringAl-Baath UniversityHomsSyria
  2. 2.Department of Mechanical, Materials and Aerospace Engineering, School of EngineeringThe University of LiverpoolLiverpoolUK

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