【摘要】 将Ti-47Al-2W-0.5Si-0.5B（ABB-23）合金经热等静压和热处理,在透射电镜下观察其组织,在α₂-Ti₃Al相中发现了呈针片状的β相析出物,有多种不同的有规律的长轴方向.β相与α₂-Ti₃Al之间的取向关系为（0001）_α2//{110}_β和<1120>_α2//<111>_β.当沿α₂相的[0001]_α2方向观察时,β相的长轴生长方向均偏离α₂相密排方向<112O>方向约14°用O点阵模型对β相在α₂相中析出时的这种特定的长轴生长方向进行了合理解释。更多还原

【Abstract】 TEM analyses were performed on Ti-47AI-2W-0.5Si-0.5B (ABB-23) alloy. There were β phase precipitates in α2 phase because of the addition of β stabilizer W element. The orientation relationship between β and α2 phases is (0001)αa2//{110}β, (1120}α2// (111)β.β precipitates exhibit six different lath directions when the incident electron beam is normal to the (0001)α2//{110}/g plane. The lath growth directions of β precipitates are predicted by the O Lattice model.更多还原