Microstructure and wear properties of laser surface-cladded Mo-WC MMC on AA6061 aluminum alloy

P. H. Chong, Hau Chung Man, Tai Man Yue

Research output: Journal article publicationJournal articleAcademic researchpeer-review

80 Citations (Scopus)

Abstract

The creation of a wear-resistant surface of metal matrix composite on AA6061 aluminum alloy by laser surface melting of pre-pasted Mo-WC powder was successfully achieved using a 2-kW CW Nd-YAG laser. A high-quality coating without porosity or cracking was obtained. Excellent bonding between the coating and the aluminum alloy substrate was ensured by the strong metallurgical interface. Different ratios of Mo and WC powders were investigated. The chemical composition, microstructure and surface morphology of the clad layer were analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD). The surface hardness of the A1 specimens clad with Mo/WC is increased seven-fold. The samples have been characterized with abrasive pin-on-disc wear tests. The test results show that the composite coating with a WC hard phase has improved abrasive wear resistance when compared with the as-received A1 substrate. The wear mechanism of the specimens is discussed based on microscopic observation of the worn surface.
Original languageEnglish
Pages (from-to)51-59
Number of pages9
JournalSurface and Coatings Technology
Volume145
Issue number1-3
DOIs
Publication statusPublished - 1 Aug 2001

Keywords

  • Aluminum alloy
  • Laser surface cladding
  • Tungsten carbide
  • Wear resistance

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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