Microstructure of laser re-melted AlCoCrCuFeNi high entropy alloy coatings produced by plasma spraying

Tai Man Yue, Hui Xie, Xin Lin, Haiou Yang, Guanghui Meng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

57 Citations (Scopus)

Abstract

An AlCoCrCuFeNi high-entropy alloy (HEA) coating was fabricated on a pure magnesium substrate using a two-step method, involving plasma spray processing and laser re-melting. After laser re-melting, the microporosity present in the as-sprayed coating was eliminated, and a dense surface layer was obtained. The microstructure of the laser-remelted layer exhibits an epitaxial growth of columnar dendrites, which originate from the crystals of the spray coating. The presence of a continuous epitaxial growth of columnar HEA dendrites in the laser re-melted layer was analyzed based on the critical stability condition of a planar interface. The solidification of a columnar dendrite structure of the HEA alloy in the laser-remelted layer was analyzed based on the Kurz-Giovanola-Trivedi model and Hunt's criterion, with modifications for a multi-component alloy.
Original languageEnglish
Pages (from-to)2833-2845
Number of pages13
JournalEntropy
Volume15
Issue number7
DOIs
Publication statusPublished - 1 Jul 2013

Keywords

  • Columnar-to-equiaxed transition
  • Epitaxial growth
  • High entropy alloy
  • Laser melting
  • Plasma spray

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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