Abstract
3D printing is increasingly becoming prevalent for the fabrication of high entropy alloys (HEAs) due to the unrivaled design freedom and net-formability. However, most 3D-printed HEAs suffer from poor printability and printing defects, displaying unsatisfactory mechanical properties for structural applications. This work reveals the near-fully dense (FeCoNi)86Al7Ti7 HEA with complex geometry and superior mechanical properties prepared by selective laser melting (SLM). During the SLM process, the rapid solidification rate induces a hierarchical structure consisting of columnar grains, cellular substructure, and L21-phase nanoprecipitates along cellular boundaries. This SLMed (FeCoNi)86Al7Ti7 HEA displays excellent mechanical properties with an ultimate tensile strength of 1090 MPa and a tensile elongation of ∼30%. The microstructure analysis reveals that the cooperative planar dislocation slipping and stacking faults contribute to the stable strain hardening ability and sustained deformation of (FeCoNi)86Al7Ti7 HEA.
Published Version
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