Simultaneously enhancing the strength and ductility of lamellar Ti–6Al–4V alloy via designing hierarchical 3D nanolayered structure

Ti-6Al-4V alloys with a hierarchical 3D nanolayered structure, comprised of nanoscale (alpha+beta) duplex phases, were successfully produced by a conventional dynamic thermal-mechanical phase transformation (DTMPT) process. The Ti-6Al-4V alloys with hierarchical 3D nanolayered structure exhibited simultaneously enhanced strength and ductility as compared to the coarse-lamellar material of the same chemistry. The strength and ductility enhancement may derived from high interface density and unique interface structure. A formation mechanism of hierarchical 3D nanolayered structure has also been proposed based on the nucleation and coarsening of alpha phase. (C) 2019 Elsevier B.V. All rights reserved.