TRIP/TWIP Networks Promoted via Multifunctional Nanoprecipitates‐confined Specified Shear for Achieving Strong‐yet‐Ductile Titanium Alloys

W4414407578 · 수집 2026-10-04 18:16:39

T10377 Metal and Thin Film Mechanics

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Abstract Transformation‐induced plasticity (TRIP) and twinning‐induced plasticity (TWIP) are typically suppressed by precipitates and difficult to be significantly triggered under high yield stress. In titanium alloys, ω phase with intrinsic deformation heterogeneity localizes deformation to {112}〈111〉 β system, exactly aligning with the lattice shear in martensite transformation (MT). Therefore, beyond reported ω‐nanoprecipitates functions, e.g., providing precipitation strengthening, maintaining strain compatibility and dynamically forming ω‐free dislocation channels, new confining specific shear is proposed to integrate precipitates with TRIP/TWIP effects in this work. A de novo design scheme, consisting of Density Functional Theory, Cluster Expansion, Monte Carlo simulations and Ab Initio Molecular Dynamics, is employed for composition screening. β phase stability and β‐ω continuous slip barriers are precisely tailored to provide large chemical driving force for MT while suppressing excessively slip priority. After simple thermomechanical processing, selected Ti‐7.92Mo‐3.22Cr‐1.88Zr alloy exhibits dense TRIP/TWIP networks and record yield strength‐ductility synergy (product exceeding 38 GPa%). Premature necking is delayed by ω‐confined elevated local stress promoting MT followed by sequential transformation from strain‐induced martensite to {332}〈113〉 β deformation twins, thus forming an extended ≈23.2% Lüders‐type strain. These theoretical and experimental results provide implementable and individual strategies to overcome yield strength‐ductility trade‐off by reconciling precipitation strengthening with TRIP/TWIP effects.

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