Effect of Fe on microstructure and properties of AlCoCrFexNi (x=1.5, 2.5) high entropy alloy coatings prepared by laser cladding

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • G.J. Zhang
  • Q.W. Tian
  • K.X. Yin
  • S.Q. Niu
  • M.H. Wu
  • W.W. Wang
  • Y.N. Wang

Detail(s)

Original languageEnglish
Article number106722
Journal / PublicationIntermetallics
Volume119
Online published31 Jan 2020
Publication statusPublished - Apr 2020

Abstract

In this study, low-cost AlCoCrFexNi (x = 1.5, 2.5) high entropy alloy (HEA) coatings were prepared by laser cladding and their microstructural evolutions, mechanical properties and wear behaviors were investigated. Both Fe–Cr rich disordered BCC(A2) phase and Al–Ni rich ordered BCC(B2) phase were identified in these coatings. At x = 1.5, the coating consisted of B2 matrix and nano-scale A2 precipitates. While, at x = 2.5, A2 matrix with B2 precipitates formed. CALPHAD revealed that addition of Fe changed the solidification sequence of coatings, and was beneficial to the formation of A2 phase, resulting in different A2/B2 morphologies. AlCoCrFe2.5Ni coating exhibited higher strength and better wear resistance, due to the strengthening effect of B2 precipitates was stronger. It was found that the properties of coatings could be improved by regulating the A2/B2 morphology. Moreover, increasing Fe content while maintaining a morphology of A2 matrix with B2 precipitates was a strategy to design high strength HEA coatings.

Research Area(s)

  • AlCoCrFexNi, High entropy alloys, Laser cladding, Microstructure, Strengthening effects, Wear resistance

Citation Format(s)

Effect of Fe on microstructure and properties of AlCoCrFexNi (x=1.5, 2.5) high entropy alloy coatings prepared by laser cladding. / Zhang, G.J.; Tian, Q.W.; Yin, K.X.; Niu, S.Q.; Wu, M.H.; Wang, W.W.; Wang, Y.N.; Huang, J.C.

In: Intermetallics, Vol. 119, 106722, 04.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review