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<1120>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.
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