Yuan Lei, Li Zongshu, Liu Wentao, Fu Ao, Wang Jian, Cao Yuankui, Liu Bin
China North Nuclear Fuel Co., Ltd., Baotou 014035, China.
CNNC Key Laboratory on Fabrication Technology of Reactor Irradiation Special Fuel Assembly, Baotou 014035, China.
Materials (Basel). 2025 May 8;18(10):2173. doi: 10.3390/ma18102173.
Aerospace and marine engineering impose higher requirements on mechanical properties and lightweight design of materials. In this work, combining the high mechanical properties of FeCrNi medium entropy alloy (MEA) and the lightweight advantages of lattice structure, four types of high-performance FeCrNi MEA lattice structures (BCC, BCCZ, FCC, and FCCZ) were prepared by selective laser melting (SLM) technology, and their dynamic mechanical properties were systematically characterized via split Hopkinson pressure bar (SHPB) method. The results demonstrate that the FCCZ FeCrNi MEA lattice structure exhibits superior comprehensive performance among the four lattice structures, achieving the highest specific compressive strength of 59.1 MPa·g·cm and specific energy absorption of 26.3 J/g, significantly outperforming conventional lattice materials including 316L and AlSi10Mg alloys. Furthermore, the finite element simulation and Johnson-Cook (J-C) constitutive model of the dynamic compression process can effectively predict the microstructural evolution and mechanical response of lattice structure, providing critical theoretical guidance for optimizing the design of high-performance lattice structure materials.
航空航天和海洋工程对材料的力学性能和轻量化设计提出了更高的要求。在这项工作中，结合FeCrNi中熵合金（MEA）的高力学性能和晶格结构的轻量化优势，通过选择性激光熔化（SLM）技术制备了四种类型的高性能FeCrNi MEA晶格结构（BCC、BCCZ、FCC和FCCZ），并通过分离式霍普金森压杆（SHPB）方法系统地表征了它们的动态力学性能。结果表明，FCCZ FeCrNi MEA晶格结构在四种晶格结构中表现出优异的综合性能，实现了最高的比抗压强度59.1 MPa·g·cm和比能量吸收26.3 J/g，显著优于包括316L和AlSi10Mg合金在内的传统晶格材料。此外，动态压缩过程的有限元模拟和Johnson-Cook（J-C）本构模型可以有效地预测晶格结构的微观结构演变和力学响应，为优化高性能晶格结构材料的设计提供关键的理论指导。
