Nanoparticle reinforced metallic composites manufactured using laser powder bed fusion (LPBF) provide an economically viable avenue to obtain high strength near-net shaped critical components in automotive and aviation industry. In this study, the equiatomic compositionally complex alloy (CCA) CoCrFeNi is manufactured by LPBF with two types of reinforcing particles, titanium nitride (TiN) and titanium oxide (TiO2). The reinforcing particles are introduced with varying size and volume concentration to the CCA powder fulfilling two purposes – improving the flowability of the feedstock and to cause nanoparticle strengthening, as demonstrated here using nanoindentation. We focus on the microstructure and texture evolution of all the alloys, and the phase transitioning of the particles. TiN nanoparticles of all sizes dissolve in the melt pool and uniformly precipitate as TiO2. We observed distinctive core-shell nanoparticle formation with higher TiN content that also resulted in 45 % higher tensile strength. The successful integration of homogenously distributed nanoparticles without inducing cracks or defects and with superior mechanical properties signifies a leap forward in the fabrication of high-performance metal matrix composites like the commercial oxide dispersion strengthened (ODS) alloys.    «

Nanoparticle reinforced metallic composites manufactured using laser powder bed fusion (LPBF) provide an economically viable avenue to obtain high strength near-net shaped critical components in automotive and aviation industry. In this study, the equiatomic compositionally complex alloy (CCA) CoCrFeNi is manufactured by LPBF with two types of reinforcing particles, titanium nitride (TiN) and titanium oxide (TiO2). The reinforcing particles are introduced with varying size and volume concentrati...    »