The scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) were used for a quasi in-situ observation on the slip trace and crystallographic orientation at four strains during the compression of a widmannstätten-structure α/β titanium alloy. The previous investigations suggested that the slip always initiated in lamellar α prior to interlayered β due to the lower yield strength and higher Young's modulus of HCP α phase. Interestingly, it is found that the slip initiates in the interlayered β prior to lamellar α within the α colony in this work. Meanwhile, the preferential slip initiation in interlayered β does not occur at the highest Schmid factor (SF) which is calculated by the applied stress. The preferential slip in interlayered β is related to the heterogeneous deformation among different α colonies, which is related to the distribution of deflection angle θ between loading direction and c-axis of α phase. The slip transfers from interlayered β to lamellar α indirectly, which not only requires a good collaboration between SF and geometric compatability parameter (m'), but also needs a large accumulation of deformation in interlayered β.

使用扫描电子显微镜（SEM）和电子反向散射衍射（EBSD）来对widmannstätten结构α/β钛合金压缩过程中在四个应变下的滑动轨迹和晶体学取向进行准原位观察。先前的研究表明，由于HCPα相的较低的屈服强度和较高的杨氏模量，滑移总是在层间β之前在层状α中引发。有趣的是，在这项工作中，发现滑移始于夹层β，先于α菌落在α菌落内的层状α。同时，在通过施加应力计算出的最高Schmid因子（SF）时，不会发生层间β的优先滑动。夹层β中的优先滑动与不同α菌落之间的异质变形有关，加载方向和α相c轴之间的θ。滑移从夹层β间接转移到层状α，这不仅需要SF和几何相容性参数（m'）之间的良好协作，而且还需要在夹层β中大量积累变形。