Fabrication and microstrain evolution of al-tib2 composite coating by cold spray deposition

H. Chen, Z. Pala, T. Hussain, D. G. McCartney

Research output: Journal PublicationArticlepeer-review

8 Citations (Scopus)
3 Downloads (Pure)

Abstract

This paper investigates the microstructure evolution of Al-TiB2 coatings prepared by cold spraying. In situ Al-TiB2 composite powders containing uniformly distributed titanium diboride (TiB2) particles with a size range of 5–100 nm in the Al matrix and Al/Al-TiB2 blended powders were used as the cold spray feedstock for coating fabrication on aluminium alloy substrates. The microstructures of the feedstock powders and as-deposited coatings were characterised using scanning electron microscopy with energy dispersive X-ray analysis and X-ray diffraction. Al/Al-TiB2 blended powder coatings, compromising closely packed powder particles, were sprayed to an approximate thickness of 500 μm. Al-TiB2 composite coatings (approximately 50 μm thick) were obtained retaining the microstructure of the composite powders being sprayed and no evidence of detrimental phase transformation was found. However, micro-cracks were found to exist in the Al-TiB2 coating due to the hardly deformable powder particles. Little or no microstrain was revealed in the as-sprayed Al-TiB2 coating, indicating that annealing may have occurred due to the localised adiabatic heating during the spraying process. It is demonstrated that it is possible to fabricate the Al-TiB2 composite coating by cold spray deposition but further improvements to eliminate coating cracking are required.

Original languageEnglish
Pages (from-to)1044-1052
Number of pages9
JournalProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Volume233
Issue number6
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Al-TiB
  • Aluminium matrix composite
  • Cold spray
  • Cracking
  • Microstrain

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanical Engineering

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