Effect of microstructure on tensile properties of Ti-5Al-5Mo-5V-3Cr-1Zr alloy

In order to understand why lamellar microstructure (LM) of Ti-55531 alloy presents a slightly higher ductility level than that of bimodal microstructure (BM) under high strength condition. The dislocation structure of specimens with lamellar and bimodal microstructures after tensile deformation were investigated in detail. The results indicate that the deformation of LM is mainly controlled by slip and twinning of secondary α phase, while the deformation of BM is mainly controlled by slip and shearing of globular αp phase.428