Laser surface alloying of NiCrSiB on Al6061 aluminium alloy

Hau Chung Man, S. Zhang, Tai Man Yue, F. T. Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

51 Citations (Scopus)

Abstract

NiCrSiB powder was mixed with a binding agent and then painted onto the roughened surface of Al6061 for laser surface alloying using a high-power Nd-YAG laser. With optimum process parameters, NiCrSiB can be successfully alloyed onto the aluminium alloy surface with good metallurgical bonding between the alloyed layer and the substrate. A porosity- and crack-free surface was achieved by overlapping single tracks. The surface consists of a fine dendritic structure of intermetallic compounds of Ni-Al. A surface hardness of 900 Hv was noted. Uneven distribution of Ni content along the depth of the alloyed surface was observed. The laser-alloyed surface has improved corrosion and protection potentials and the same pitting potential as compared with those of the AI6061. In the vibratory cavitation erosion test in 3.5%NaCl, the weight loss of the specimen with a NiCrSiB alloyed surface was half of that of the A16061.
Original languageEnglish
Pages (from-to)136-142
Number of pages7
JournalSurface and Coatings Technology
Volume148
Issue number2-3
DOIs
Publication statusPublished - 3 Dec 2001

Keywords

  • Aluminium alloy
  • Cavitation erosion
  • Laser surface-alloying
  • NiCrSiB

ASJC Scopus subject areas

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

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