Coexistence of multi-deformation modes in beta Ti alloys with improved yielding strength and ductility

Coexistence of multi-deformation modes in beta Ti alloys with improved yielding strength and ductility

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By suppressing SIM (stress induced martensitic) phase transformations, a strong and ductile beta TWIP (twinning induced plasticity) Ti-Mo based alloy was achieved, thanking to the coexistence of mechanical twinning ({112} mode and {332} mode) and dislocation here glide.The alloy displayed extra high yielding stress, stable strain-hardening rate and adequate ductility.In-situ traction/EBSD Canvas Mesh Athletic Running Shoes technique and TEM characterizations were employed to investigate the plastic deformation mechanism.

The dislocation slipping was mediated by bimodal twinning mechanism, composed by high density nano-scale {112} twinning in micro {332} twinning grid.The study aims to exploit novel design strategy for strengthening ductile TWIP Ti alloys, attributed to multimodal twinning effects.