Phase evolution and dendrite growth in laser cladding of aluminium on zirconium

Tai Man Yue, H. Xie, X. Lin, H. O. Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

Aluminium was laser clad on a pure zirconium substrate using the blown powder method. The microstructure across the laser-clad coating was studied. Starting from the bottom to the top surface of the coating, a series of phase evolutions had occurred: (Zr) → (Zr) + AlZr2+ AlZr3→ Al4Zr5+ Al3Zr2→ Al3Zr2+ AlZr2→ Al2Zr → Al2Zr + Al3Zr. This resulted in an epitaxial columnar crystal growth at the re-melt substrate boundary, a band of backward growth Al3Zr2dendrites towards the lower half of the coating, and a two-phase eutectic dendritic growth of Al2Zr + Al3Zr towards the top of the coating. The evolution of the various phases and microstructures is discussed in conjunction with the Al-Zr phase diagram, the criteria for planar interface instability, and the theory of eutectic growth under rapid solidification conditions (the TMK model).
Original languageEnglish
Pages (from-to)3705-3710
Number of pages6
JournalJournal of Alloys and Compounds
Volume509
Issue number8
DOIs
Publication statusPublished - 24 Feb 2011

Keywords

  • Aluminium
  • Dendrite growth
  • Intermetallics
  • Laser cladding
  • Phase evolution
  • Zirconium

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this