Tri-modal microstructure is often the target microstructure of titanium alloy components. In this study, the parameters, such as volume fraction, size of primary equiaxed α (α p ), secondary lamellar α (α s ) and thin α plates (α t ) in tri-modal microstructure of Ti-6Al-2Zr-1Mo-1V alloy are adjusted by double heat treatment procedures. The properties of these constituent phases and their effect on the macro-properties are then investigated. The results show that the hardness of primary α (α p ) varies slightly with heat treatment routes. The hardness of α plates region including α s and α t increases with increasing α t volume fraction and not with decreasing thickness of α s and α t . Using volume average of the thickness of α s and α t as effective thickness (t eff ), the hardness of α plates region and t eff follow the Hall-Petch relationship. Meanwhile, as α t volume fraction increases, colony structure of α s is gradually destroyed, which makes each α s have large deformation degree by multiple directions slip. When volume fraction ratio of α p , α s and α t is about 1:1:1, α p and α s can undergo relatively large deformation and α t can contribute relatively large strength to the alloy and therefore the alloy has both good strength and ductility.
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