Solidification behaviour and the evolution of microstructure in the laser cladding of aluminium on magnesium substrate

Tai Man Yue, T. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Laser cladding of aluminium powders was performed on pure magnesium substrates using the blown powder method. The microstructure across the laser-clad track was studied. Starting from the bottom of the laser-clad to the top surface of the track, a series of microstructures was observed: a planar growth interface of the substrate, a narrow band of (β + γ) eutectic, a narrow band of β cellular structure, and finally a relatively thick layer of α-Al and (α + β) eutectic structure. The evolution of the various phases and microstructures is discussed in terms of the distribution of solute in conjunction with the Al-Mg phase diagram, temperature gradient and solidification rate, constitutional supercooling theory, and the condition for columnar-to-equiaxed crystal transition.
Original languageEnglish
Pages (from-to)1064-1069
Number of pages6
JournalMaterials Transactions
Volume48
Issue number5
DOIs
Publication statusPublished - 1 May 2007

Keywords

  • Cellular structure
  • Equiaxed crystal
  • Interface stability
  • Laser cladding
  • Solidification

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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