Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 843, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143106
Keywords
High entropy alloy; 3D printing; Cellular structure; Mechanical properties; Stacking fault
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Funding
- National Natural Science Foundation of China [52061160483, 52061160, 52022100]
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This study reveals the preparation of a high entropy alloy with complex geometry and superior mechanical properties through selective laser melting. The rapid solidification rate during the process induces a hierarchical structure, contributing to excellent mechanical properties.
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)(86)Al7Ti7 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)(86)Al7Ti7 HEA displays excellent mechanical properties with an ultimate tensile strength of 1090 MPa and a tensile elongation of similar to 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)(86)Al7Ti7 HEA.
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