论文部分内容阅读
The structure change of α2/γ interface in a Ti-45Al-10Nb alloy induced by hot deformation was investigated by conventional and high-resolution transmission eIectron microscopy. Two types of hot deformation induced special α2/γ intedeces, coherent intedeces with high density of ledges and semi-coherent α2/γ intedeces were found to be due to the absorption of mobile dislocations into the α2/γ inteface. For the misoriented semi-coherent α2/γ interfaces, the densities of dislocation ledges increase with the misoriented angle between (111)γ and (0001)α2 planes, and 1/3[111] Frank partial dislocations were involved in the dislocation ledges. Formation mechanism of these deformation-induced α2/γ interfaces was discussed to be related to the role of α2/γ interface5 adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase
The structure change of α2 / γ interface in a Ti-45Al-10Nb alloy induced by hot deformation was investigated by conventional and high-resolution transmission eIectron microscopy. Two types of hot deformation induced special α2 / γ intedeces, coherent intedeces with high density of ledges and semi-coherent α2 / γ intedeces were found to be due to the absorption of mobile dislocations into the α2 / γ inteface. For the misoriented semi-coherent α2 / γ interfaces, the densities of dislocation ledges increase with the misoriented angle between 111) γ and (0001) α2 planes, and 1/3 [111] Frank partial dislocations were involved in the dislocation ledges. Formation mechanism of these deformation-induced α2 / γ interfaces was discussed to be related to the role of α2 / γ interface5 adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase