(1.北京科技大學新金屬材料國家重點實驗室，北京 100083;
2.中國科學院金屬研究所固體原子象開放實驗室，沈陽 110015)
摘 要: 利用常規(guī)和高分辨電鏡(HREM)，研究了熱形變誘導的Ti-45Al-8Nb-2.5Mn-0.05B合金中偏離嚴格取向關(guān)系的α2/γ片層界面結(jié)構(gòu)，以及橫過片層的T(Q)型γ孿晶與α2(Q)薄層優(yōu)先在這些偏離嚴格取向關(guān)系的α2/γ片層界面上形成的機理。由于其片層界面上較大的應(yīng)力集中，通過界面上的復(fù)雜位錯核心反應(yīng)將導致這些T(Q)型γ孿晶與α2(Q)薄層的產(chǎn)生。
關(guān)鍵字: TiAl合金 α2/γ相界面 熱形變誘導
（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
