Anisotropy of Young's modulus and tensile properties in cold rolled α′ martensite Ti-V-Sn alloys

0.2% proof stress and tensile strength are independent of tensile orientation for cold rolled Ti-8% V and (Ti-8% V)-4%Sn alloys. In contrast, larger elongation to fracture is obtained in specimens deviated by 30°, 45° and 60° from RD than by 0°, 75° and 90°. Scanning electron microscopy (SEM) fractographs reveal that quasi-cleavage-like fracture plane appears in 0° specimen of cold rolled Ti-8% V which shows brittle fracture and other specimens of cold rolled Ti-8% V and (Ti-8% V)-4%Sn alloys are fractured accompanied with necking and dimple formation. It is suggested from these results that brittle fracture is related to the activation of limited number of slip system and Sn addition leads to the activation of multiple slip systems.