Composition-driven twinning activation and dynamic strain hardening in Ti-based metallic glass matrix composite

An in-situ Ti-based metallic glass matrix composite Ti₄₃Zr₃₂Ni₇Ta₄Be₁₄ (at. %), optimized via compositional refinement from Ti₄₃Zr₃₂Ni₆Ta₅Be₁₄ (at. %), achieves more exceptional dynamic mechanical performance through twinning activation. This composite demonstrates enhanced yield strength (1712–1811 MPa) and plasticity (3.3 %) under dynamic loading (1000–1500/s), outperforming the one before optimizing, by utilizing synergistic twinning-induced plasticity and dislocation mechanisms to counteract matrix softening mechanism. Compositional tuning reduces stacking fault energy via electronegativity/atomic radius optimization (e.g., Ni substitution for Ta), facilitating deformation twinning and stress redistribution at glass-crystal interfaces. Finite element analysis and a modified Johnson-Cook model validate the synergy between strain-rate strengthening, adiabatic heating, and interfacial load transfer, while multiscale microstructural characterization confirms shear bands evolution, dislocation mechanism and twins as critical plasticity enhancers.