Laser cladding of Cu0.5NiAlCoCrFeSi high entropy alloy on AZ91D magnesium substrates for improving wear and corrosion resistance

Tai Man Yue, K. Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

To improve the wear and corrosion properties of AZ91D magnesium alloy, a Cu0.5NiAlCoCrFeSi high entropy alloy (HEA) was fabricated on AZ91D magnesium substrate specimens by laser cladding using elemental powders. The laser-clad coating consists of a fine dendritic structure of a simple BBC phase with nano-size precipitates. The hardness of the coating was some ten times higher than that of the AZ91D substrate and was even higher than that of the same HEA produced by arc melting. The laser-clad coating exhibited good wear resistance, with a wear rate five times lower than that of the substrate material in dry friction wear conditions. The main wear mechanisms of the substrate and the HEA coating were different, the former dominated by both abrasive wear and adhesive wear and the latter by oxidative abrasive wear. With regard to corrosion properties, the laser-clad coating exhibited a more positive corrosion potential and a lower corrosion current density than those of the uncoated substrate material.
Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalWorld Journal of Engineering
Volume9
Issue number2
DOIs
Publication statusPublished - 2012

Keywords

  • Laser cladding
  • High entropy alloy
  • Magnesium
  • Wear
  • Corrosion

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials

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