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

• DOI: 10.1016/j.matdes.2024.112754
• Publication Date: 2024-02-13T16:43:41Z
• Authors: M. Song; B.W. Ma; H.Q. Huang; L.X. Liu; R. Guo; Y.Z. Yin; H.T. Wang; D.D. Li; N. Li; J. Pan; L. Liu
• Keywords: Selective Laser Melting; Equiaxed crystals; Deformation mechanism; High-Entropy Alloys

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