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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of volumetric energy density on microstructure and tribological properties of FeCoNiCuAl high-entropy alloy produced by laser powder bed fusion
AU - Ren, Y.
AU - Liang, L.
AU - Shan, Q.
AU - Cai, A.
AU - Du, J.
AU - Huang, Q.
AU - Liu, S.
AU - Yang, X.
AU - Tian, Y.
AU - Wu, H.
PY - 2020/12/31
Y1 - 2020/12/31
N2 - 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).
AB - 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).
KW - High-entropy alloy
KW - laser powder bed fusion
KW - microstructure evolution
KW - tribological behaviour
KW - Aluminum alloys
KW - Entropy
KW - High-entropy alloys
KW - Iron alloys
KW - Microstructure
KW - Sintering
KW - Tribology
KW - Wear resistance
KW - Yield stress
KW - Alloy powder
KW - Columnar grain
KW - Elastic strain
KW - Laser powders
KW - Micro-structural characteristics
KW - Preferred orientations
KW - Tribological properties
KW - Volumetric energy densities
KW - Cobalt alloys
U2 - 10.1080/17452759.2020.1848284
DO - 10.1080/17452759.2020.1848284
M3 - Journal article
VL - 15
SP - 543
EP - 554
JO - Virtual and Physical Prototyping
JF - Virtual and Physical Prototyping
SN - 1745-2759
IS - S1
ER -