(1.北京科技大学新金属材料国家重点实验室，北京 100083;
2.中国科学院金属研究所固体原子象开放实验室，沈阳 110015)
摘 要: 利用常规和高分辨电镜(HREM)，研究了热形变诱导的Ti-45Al-8Nb-2.5Mn-0.05B合金中偏离严格取向关系的α2/γ片层界面结构，以及横过片层的T(Q)型γ孪晶与α2(Q)薄层优先在这些偏离严格取向关系的α2/γ片层界面上形成的机理。由于其片层界面上较大的应力集中，通过界面上的复杂位错核心反应将导致这些T(Q)型γ孪晶与α2(Q)薄层的产生。
关键字: TiAl合金 α2/γ相界面 热形变诱导
（1.State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083 ;
2.Laboratory of Atomic Imaging of Solids, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110015）
Abstract:The interfacial structure of α2/γ lamellae deviating the strict orientation relationship in a hot-forged Ti-45Al-10 Nb-2.5Mn-0.05B(mole fraction, %) alloy and the preferential formation mechanism of T(Q)-type twin and α2(Q) laths at these interlamellar interfaces have been investigated by the conventional and high-resolution electron microscopy. The lath formation process involves complex transformations of the interfacial dislocation core and can be activated preferentially under concentrated stress fields at these interlamellar interfaces.
Key words: TiAl alloy α2/γ interface hot-deformation-induced
