Additive manufacturing of high-strength and ductile high entropy alloy CoCrFeNiW0.2 composites via laser powder bed fusion and post-annealing

A CoCrFeNiW(0.2 )metal-matrix composite (MMC) was fabricated by laser powder bed fusion (LPBF) and postannealing, which exhibited comparable tensile ductility (44%) and yield strength (385 MPa) to as-casted CoCrFeNiW high entropy alloys with much higher W concentration. An Integrated Computational Materials Engineering (ICME) framework coupled with thermo-kinetic simulations was built to investigate the microstructure evolution and mechanical response of the as-fabricated and post-annealed MMCs. The combination of strength and ductility of the MMC can be attributed to the synergistic combination of dislocation, solid solution and grain boundary strengthening due to the multiple roles of W in the LPBF and post-annealing processes. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A CoCrFeNiW metal-matrix composite (MMC) fabricated by laser powder bed fusion and post-annealing exhibits comparable tensile ductility and yield strength to as-casted CoCrFeNiW high entropy alloys. The synergistic combination of dislocation, solid solution, and grain boundary strengthening due to the multiple roles of W in the fabrication process contributes to the strength and ductility of the MMC.