A strong fracture-resistant high-entropy alloy with nano-bridged honeycomb microstructure intrinsically toughened by 3D-printing
Punit Kumar,
Sheng Huang,
David H. Cook,
Kai Chen,
Upadrasta Ramamurty,
Xipeng Tan () and
Robert O. Ritchie ()
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Punit Kumar: University of California
Sheng Huang: Nanyang Technological University
David H. Cook: University of California
Kai Chen: Xi’an Jiaotong University
Upadrasta Ramamurty: Nanyang Technological University
Xipeng Tan: National University of Singapore
Robert O. Ritchie: University of California
Nature Communications, 2024, vol. 15, issue 1, 1-9
Abstract:
Abstract Strengthening materials via conventional “top-down” processes generally involves restricting dislocation movement by precipitation or grain refinement, which invariably restricts the movement of dislocations away from, or towards, a crack tip, thereby severely compromising their fracture resistance. In the present study, a high-entropy alloy Al0.5CrCoFeNi is produced by the laser powder-bed fusion process, a “bottom-up” additive manufacturing process similar to how nature builds structures, with the microstructure resembling a nano-bridged honeycomb structure consisting of a face-centered cubic (fcc) matrix and an interwoven hexagonal net of an ordered body-centered cubic B2 phase. While the B2 phase, combined with high-dislocation density and solid-solution strengthening, provides strength to the material, the nano-bridges of dislocations connecting the fcc cells, i.e., the channels between the B2 phase on the cell boundaries, provide highways for dislocation movement away from the crack tip. Consequently, the nature-inspired microstructure imparts the material with an excellent combination of strength and toughness.
Date: 2024
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DOI: 10.1038/s41467-024-45178-2
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