Achieving excellent strength-ductility synergy of Ti6Al4V alloy produced by powder metallurgy and thermo-mechanical treatment

Ke Feng, Hongmei Zhang*, Xingwang Cheng, Qunbo Fan, Xiaonan Mu, Ni Xiong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study aimed to enhance the mechanical properties of Ti6Al4V alloy through powder metallurgy and thermo-mechanical treatment (TMT). By engineering a fine primary α phase (αp) and heterogeneous martensite (α′) microstructure, comprising fine martensite laths (FMLs) and coarse martensite laths (CMLs), we achieved an exceptional combination of strength σb∼1148.15 MPa and ductility ϵf∼24.32%. Detailed TEM analysis revealed variations in nanohardness between αp and α′ regions, strain partitioning between the two constituents, and a strain gradient from the αp/α′ interface to the grain interior of αp and α’. This activated a large number of geometrically necessary dislocations (GNDs) near the interface, mostly with <c+a> components, contributing significantly to the alloy's extraordinary work-hardening abilities. Strengthening of Ti6Al4V alloy was mainly attributed to the formation of hierarchical nanotwins and solid solution of Al elements in αp and α′, effectively impeding dislocation motion. These results open up possibilities for obtaining Ti6Al4V with high strength and ductility synergistically, with potential applicability to other materials.

Original languageEnglish
Article number112448
JournalVacuum
Volume217
DOIs
Publication statusPublished - Nov 2023

Keywords

  • Mechanical properties
  • Powder metallurgy
  • Thermo-mechanical treatment
  • Ti6Al4V alloy

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