Study on the Energy Absorption of Eutectic High Entropy Alloy AlCoCrFeNi2.1 TPMS Lattice Structures Fabricated by Laser Powder Bed Fusion

doi:10.3901/JME.260078

Abstract

Abstract: There are significant challenges in balancing the strength and plasticity in traditional alloy triply periodic minimal surface (TPMS) lattice structures fabricated by laser powder bed fusion (LPBF). In this work, a systematic study on the LPBF process of AlCoCrFeNi_2.1 eutectic high entropy alloy and its TPMS lattice structures' mechanical properties has been conducted. The optimal parameter combination resulted in the elastic modulus of 255 GPa, the yield stress of 1348 MPa, the compressive strength of 2520 MPa, and the compressive strain exceeding 25%. Microstructure characterization revealed a dual-phase nanolamellar structure of FCC (130-250 nm) and BCC (20-30 nm) with element segregation forming heterogeneous interfaces for synergistic strengthening. Diamond, Gyroid, Primitive TPMS structures and BCC truss structures are fabricated to reveal the influence of lattice configuration, relative density, and unit cell size on quasi-static compression properties. The elastic modulus, yield stress, and energy absorption are positively correlated with the relative density. The maximum energy absorption of Diamond, Gyroid, and Primitive structures reached 2369 J, 2062 J, and 1096 J, respectively. The elastic modulus and yield stress increased linearly with unit cell size, and the plateau stress and energy absorption are enhanced simultaneously. At a relative density of 40%, the specific elastic modulus of Gyroid and Primitive structures reached 47.8 GPa/kg and 46.9 GPa/kg respectively. The Diamond structure had the best comprehensive properties with a specific elastic modulus of 72.6 GPa/kg and a specific energy absorption of 38.7 J/g. Compared with TPMS lattices of 316L stainless steel and Ti-6Al-4V titanium alloy, the AlCoCrFeNi_2.1 lattice structure has superior strength-plasticity matching and great application prospects for high load-bearing and energy absorption under extreme loading conditions.

Key words: eutectic high-entropy alloy, TPMS lattice structures, LPBF additive manufacturing, energy absorption performance

CLC Number:

TH16

WANG Kangshuai, WEI Huiliang, WU Yuefeng, SHI Jiaming, LIU Tingting, LIAO Wenhe. Study on the Energy Absorption of Eutectic High Entropy Alloy AlCoCrFeNi_2.1 TPMS Lattice Structures Fabricated by Laser Powder Bed Fusion[J]. Journal of Mechanical Engineering, 2026, 62(3): 176-189.

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Study on the Energy Absorption of Eutectic High Entropy Alloy AlCoCrFeNi_2.1 TPMS Lattice Structures Fabricated by Laser Powder Bed Fusion

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