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The plastic deformation and fracture processes of Ti-3Zr-2Sn-3Mo-25Nb alloy for surgical implants were directly observed by in situ scanning electron microscopy(SEM).The effect of phase transformations on deformation-induced martensitic transformation accompanying the cyclic tensile fracture processes was investigated.The results reveal that the metastable alpha martensites(α")promotes deformation-induced martensitic transformation to ductile fracture,whereas the omega(ω)and alpha(α)phases drastically prevent slip dislocation and deformation-induced martensitic transformation to brittle fracture.