In-situ nano-reprecipitation enables superior cryogenic mechanical properties in a 3D printable medium-entropy alloy.

ABSTRACT: Precipitates or second-phase particles effectively strengthen metallic materials. Their use in additive manufacturing (AM), however, is constrained by the narrow thermal window of laser processing, which restricts control over precipitate characteristics. Here, we overcome this problem by creating a novel cryogenically strong and ductile alloy by a size-dependent composite powder feedstock design consisting of CoCrNi medium-entropy alloy core powders and decorated TiC shell nanoparticles. We show that these compound particles can be completely dissolved into the alloy during the first laser pulse of AM and then reprecipitate in situ upon subsequent cyclic reheating. Consequently, we introduce a high number density of nanosized TiC precipitates, coherent with the matrix. Their strong resist

SUBMITTER: Lu T 

PROVIDER: S-EPMC12808310 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature