集合組織制御したチタン板の変形挙動に及ぼす酸素の影響

抄録

Mechanical properties of α Ti are strongly influenced by texture and oxygen content. The effect of texture and oxygen content on the deformation behavior was investigated using three kinds of textured Ti sheets containing 0.05, 0.1, 0.2 and 0.4 mass%O. Especially, we paid attention to deformation twinning and ⟨c+a⟩ slip. Consequently, it was found that occurrence of deformation twinning is suppressed and ⟨c+a⟩ dislocations become operative as the oxygen content increases. Therefore, anisotropy in mechanical properties due to the deformation twinning disappears as the oxygen content increases. However, the operation of ⟨c+a⟩ slip having high critical resolved shear stress leads to easy cleavage fracture and reduced elongation.