Mechanical properties of CoCrFeMnNi high entropy alloy lattice structures formed by selective laser melting

作者：Yu Du, Ketai He, Rong Guo, Zhipeng Zhou, Guoxuan Ming, Qi Liu, Hao Dong · 发表于：Materials & Design · 年份：2025 · DOI：10.1016/j.matdes.2025.113777 · 被引用次数：18 · 研究领域：High Entropy Alloys Studies、Additive Manufacturing Materials and Processes、High-Temperature Coating Behaviors

• A lattice structure with superior mechanical property was designed. • Four lattice structures were fabricated by selective laser melting. • Compression failure mode was studied using experiments and simulations. • The mechanical properties of four lattice structures were compared by parameters. The special structure of the lattice structure makes it have many excellent properties. CoCrFeMnNi high-entropy alloys (HEAs) is widely used due to its good plasticity, low temperature strength and other advantages. To enhance the mechanical properties of the lattice structure, a unique decahedral internal diamond (DID) unit cell type was designed to construct the periodic lattice structure. The DID lattice structure was prepared by SLM using CoCrFeMnNi HEAs spherical powder as the material, and its surface morphology was observed under SEM. In comparison to conventional lattice structures, various lattice structures’ mechanical properties and deformation behaviors were analyzed using quasi-static compression tests and finite element analysis. Additionally, the effects of different rod diameter on the compressive performance and energy absorption characteristics of the DID lattice structure were also studied. The results show that the lattice structure prepared by SLM has good forming quality. In the tested samples, the DID structure has better bearing capacity and energy absorption performance, and the yield strength of the DID lattice structure with an overall size of 15 mm × 15 mm...