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

Ren, Y. and Liang, L. and Shan, Q. and Cai, A. and Du, J. and Huang, Q. and Liu, S. and Yang, X. and Tian, Y. and Wu, H. (2020) Effect of volumetric energy density on microstructure and tribological properties of FeCoNiCuAl high-entropy alloy produced by laser powder bed fusion. Virtual and Physical Prototyping, 15 (S1). pp. 543-554. ISSN 1745-2759

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Abstract

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).

Item Type:
Journal Article
Journal or Publication Title:
Virtual and Physical Prototyping
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2209
Subjects:
ID Code:
150423
Deposited By:
Deposited On:
13 Jan 2021 11:40
Refereed?:
Yes
Published?:
Published
Last Modified:
08 Jun 2021 07:20