Harnessing Bifunctional Nitrogen-Dislocation Interactions for a Record Ultra-Strong-and-Ductile Duplex Titanium Alloy.

ABSTRACT: Duplex (α+β) Ti alloys often manifest limited uniform elongation (ε_u) mainly originating from the lack of dislocations for insufficient work hardening capability and semi-coherent α/β interfaces for strain incompatibility. The strength-ductility trade-off of duplex Ti alloys is further amplified by interstitial atoms-poisoning effects (e.g., N and O). Here, by selecting N atoms with the strongest hardening ability in Ti alloys, a counterintuitive strategy is proposed that harnesses bifunctional N-dislocation interactions in a model duplex Ti-Cr-Zr-Al alloy to construct a heterogeneous lamella structure, involving the elongated α_p grains decorated with N-rich low-angle grain boundaries (LAGBs) and densely coherent interstitial-N α'-nanotwinned martensites in β-gr

SUBMITTER: Zhang C 

PROVIDER: S-EPMC12376552 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature