Dual-phase synergistic deformation characteristics and strengthening mechanism of AlCoCrFeNi2.1 eutectic high entropy alloy fabricated by laser powder bed fusion

doi:10.1016/j.jmst.2022.11.045

Abstract

Abstract: Eutectic high entropy alloy (EHEA) possesses promising prospects for industrial application due to its controllable and near-equilibrium dual-phase structure. Due to the advantages of high material utilization, efficient production, and design freedom, the laser powder bed fusion (LPBF) technique provides a new path to prepare EHEA components with complex structure and excellent performance. In this study, near fully dense AlCoCrFeNi_2.1 samples were obtained by adjusting the process parameters of LPBF. Considering the balling phenomenon and powder splashing during the LPBF process, laser remelting was selected as an optimized scanning strategy to further improve the forming quality of AlCoCrFeNi_2.1. The microstructure of remelted AlCoCrFeNi_2.1 sample exhibited regular eutectic lamellae consisting of nano-scale face-centered-cubic (FCC) and B2 phases, in which the FCC phase accounted for a higher proportion. By investigating the tensile behavior and deformation mechanism, it was revealed that the ultrafine eutectic lamellae could induce a strong dual-phase synergistic strengthening, thereby significantly improving the strength of the sample. Compared with the vacuum induction melted (VIM) sample, the remelted sample showed a 54% increase in ultimate tensile strength (UTS -1518 MPa) and a 130% increase in yield strength (YS -1235 MPa) with reasonable plasticity. This study indicates that by combining the design and manufacturing freedom of LPBF with the EHEA, it is expected to fabricate high-property 3D EHEA parts, expanding the application field of EHEA.

Key words: Laser powder bed fusion, Remelting, Eutectic high entropy alloy, Microstructure, Deformation mechanism

Xu Tang, Hao Zhang, Zhengwang Zhu, Peng Xue, Lihui Wu, Fengchao Liu, Dingrui Ni, Bolv Xiao, Zongyi Ma. Dual-phase synergistic deformation characteristics and strengthening mechanism of AlCoCrFeNi_2.1 eutectic high entropy alloy fabricated by laser powder bed fusion[J]. J. Mater. Sci. Technol., 2023, 150: 75-85.

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Dual-phase synergistic deformation characteristics and strengthening mechanism of AlCoCrFeNi_2.1 eutectic high entropy alloy fabricated by laser powder bed fusion

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