Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 867, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2023.144745
Keywords
Additive manufacturing; High-entropy alloys; Lamellar microstructure; Mechanical properties
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A high-strength lamellar high-entropy alloy (HEA) of Zr45Ti31.5Nb13.5Al10 with excellent ductility was fabricated by in-situ alloying of blended elemental powders via laser directed energy deposition (DED). Microstructure characterizations suggest that the molten pools with body-centred cubic (BCC) structure and heat affected zones with mixed structure of BCC + ordered BCC (B2) nanoprecipitates, are alternately distributed in the DEDprocessed HEA with a lamellar structure. This research provides new options for the design and manufacturing of HEAs with outstanding mechanical properties for structural applications.
A high-strength lamellar high-entropy alloy (HEA) of Zr45Ti31.5Nb13.5Al10 with excellent ductility was fabricated by in-situ alloying of blended elemental powders via laser directed energy deposition (DED). Microstructure characterizations suggest that the molten pools with body-centred cubic (BCC) structure and heat affected zones with mixed structure of BCC + ordered BCC (B2) nanoprecipitates, are alternately distributed in the DEDprocessed HEA with a lamellar structure. During the deformation process, the molten pools are dominated by dislocation planar slipping, while in the heat affected zones, frequent cross-slip and dislocations pinning caused by dispersed B2 nanoprecipitates occurred, which endows a significant strain hardening capability and deformation uniformity in the DED-processed HEA. This research provides new options for the design and manufacturing of HEAs with outstanding mechanical properties for structural applications.
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