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Effect of volumetric energy density on microstructure and tribological properties of FeCoNiCuAl high-entropy alloy produced by laser powder bed fusion

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Y. Ren
  • L. Liang
  • Q. Shan
  • A. Cai
  • J. Du
  • Q. Huang
  • S. Liu
  • X. Yang
  • Y. Tian
  • H. Wu
<mark>Journal publication date</mark>31/12/2020
<mark>Journal</mark>Virtual and Physical Prototyping
Issue numberS1
Number of pages12
Pages (from-to)543-554
Publication StatusPublished
Early online date7/12/20
<mark>Original language</mark>English


A near-equiatomic FeCoNiCuAl High-entropy alloy (HEA) was produced using laser powder bed fusion (L-PBF) pre-alloy powder. Microstructural characteristics and tribological properties of L-PBF specimens under various volumetric energy densities (VEDs) were investigated in detail. The results showed that the phase of L-PBF specimen consisted of BCC matrix + Cu-rich B2 precipitate. The microstructure of L-PBF specimen largely consisted of columnar grains perpendicular to the melt pool boundary (MPB) direction owing to the epitaxial growth along the temperature gradient. The preferred orientation of the L-PBF specimen was gradually transformed from the order of <001> to <101> as the VED rose. Larger size precipitates re-appeared and wider MPB were formed upon faster remelting and steeper cooling as a result of higher VED. Compared to the components produced by Spark Plasma Sintering, L-PBF specimens presented better wear resistance owing to the ultra-fine substructure and nano-scaled precipitates. In addition, the L-PBF specimen produced with 83 J/mm3 VED exhibits the highest elastic strain to failure (H/Er) and yield stress (H 2/E r3).