A novel Ni40Co18Cr18Fe14Al5Ti5 high entropy alloy with superior mechanical properties and broad printing window via selective laser melting

作者：Min Song, Bowen Ma, Hailiang Huang, Lian X. Liu, Rong Guo, Y.Z. Yin, Haitao Wang, Dongdong Li, Ning Li, Jie Pan, Lei Liu · 发表于：Materials & Design · 年份：2024 · DOI：10.1016/j.matdes.2024.112754 · 被引用次数：18 · 研究领域：High Entropy Alloys Studies、Additive Manufacturing Materials and Processes、High-Temperature Coating Behaviors

3D printing technology has gained popularity in fabricating high-entropy alloys (HEAs) due to its inherent design adaptability and the capacity to create distinctive structural features. However, the field of 3D-printed HEAs has faced substantial challenges, primarily stemming from a narrow processing window and unsatisfactory mechanical properties. This study unveils a novel Ni40Co18Cr18Fe14Al5Ti5 HEA, suitable for selective laser melting (SLM) technology, showcasing a broad processing window and outstanding mechanical properties. The SLM-produced HEA exhibits near-full density and a hierarchical structure characterized by equiaxed grains without significant texture, cellular structures, and element segregation at cellular boundaries. Remarkably, this HEA demonstrates impressive mechanical performance across various printing parameters, highlighted by a yield strength of 811 MPa, an ultimate strength reaching 1071 MPa, and a tensile elongation of 29 % in the optimized sample. Microstructural analysis reveals that the synergistic effects of dislocation motion, stacking faults, and deformation-induced twinning contribute to the stable strain-hardening capability of the SLM-produced Ni40Co18Cr18Fe14Al5Ti5 HEA.