Microstructure and mechanical properties of Cf/Al-TiAl laser-assisted brazed joint

Guangjie Feng, Zhuoran Li, Zhi Zhou, Yong Yang, Dusan P. Sekulic, Michael R. Zachariah

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A high-efficiency brazing method was developed to join Cf/Al composites to TiAl alloys with the assistance of laser-induced exothermic reaction of a Ni-Al-Zr interlayer. The microstructure and mechanical properties of the Cf/Al-TiAl joint were investigated. The joint interfacial structure represented TiAl alloys/Al3NiTi2/NiAl+Ni-Al-Zr+Al-Cu-Ti+Ag(s,s)/(Ni,Ti,Zr)Al3/Cf/Al composites. A ∼ 400 nm thick Ti and Zr rich layer was formed around carbon fibers, largely enhancing the bonding quality on the Cf/Al side. The thickness of AgCu foils on each side and the brazing pressure influenced the interfacial reactions and the joint morphology. When the thickness of AgCu foils was 100 μm and the brazing pressure was 4 MPa, the joint was free of defects, and had a maximum shear strength of 71.6 MPa.

Original languageEnglish
Pages (from-to)195-203
Number of pages9
JournalJournal of Materials Processing Technology
Volume255
DOIs
StatePublished - May 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Brazing
  • C/Al composites
  • Mechanical properties
  • Microstructures
  • Self-propagating high-temperature synthesis
  • TiAl alloys

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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