Characterisation of Al–Ti dissimilar material joints fabricated using ultrasonic additive manufacturing

P. J. Wolcott, N. Sridharan, S. S. Babu, A. Miriyev, N. Frage, M. J. Dapino

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Ultrasonic additive manufacturing (UAM) is a solid state manufacturing process for joining thin metal tapes using principles of ultrasonic metal welding. The process operates at low temperatures, enabling dissimilar material welds without generating harmful intermetallic compounds. In this study, a 9 kW UAM system was used to create joints of Al 1100 and commercially pure titanium. Viable process parameters were identified through pilot weld studies via controlled variation of weld force, amplitude and weld speed. Push-pin delamination tests and shear tests were performed, comparing as-built, heat treated and spark plasma sintering treated samples. Heat treated and spark plasma sintering treated samples yielded mechanical strengths over twice that of as-built samples. Electron backscatter diffraction measurements show that deformation and grain refinement only take place in the aluminium layers. Heat treated samples exhibit a thin intermetallic layer, which is hypothesised as constraining the interface, leading to the improved strength.

Original languageEnglish
Pages (from-to)114-123
Number of pages10
JournalScience and Technology of Welding and Joining
Volume21
Issue number2
DOIs
StatePublished - 1 Jan 2016

Keywords

  • Dissimilar joining
  • Metal matrix composites
  • Post-treatment
  • Ultrasonic additive manufacturing
  • Ultrasonic welding

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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