The evolution of microstructure in Al-Zn-Mg alloys during plastic deformation subjected to uniaxial tensile deformation was studied using a tensile stage and EBSD equipped in a SEM. The results indicate that the grain orientation rotates with increasing external strain. Grains with the same or similar orientation rotate along the same tendency. However, some orientation can rotate either following the Sachs model or the Taylor model. Grains with orientation close to ( 101 ) rotate toward the line of (001 )-( 111 ) following the Sachs model. Grains with orientation close to the line of (001 )-( 111) can rotate either towards (111) following the Taylor model or towards the line of (001)-(111) following the Sachs model. Grain rotation can lead to either decrease or increase of the Schmid factor depending on the initial orientation. Grain orientation rotation in polycrystalline materials is affected by the orientation and deformation behavior of its neighboring grains.%利用扫描电镜中的拉伸台和原位背散射电子衍射(EBSD)研究了Al-Zn-Mg合金在单轴拉伸过程中塑性变形的显微结构演化规律.结果表明,晶粒的取向在塑性变形过程中会发生明显的转动行为.晶粒具有相同或相近的取向,其转动会沿近似的趋势进行.〈101〉取向附近的晶粒其取向转动按照Sachs模型进行,向〈001〉-〈111〉连线方向转动；〈001〉-〈111〉连线附近的晶粒其取向转动按照Taylor模型向〈111〉方向转动,或按照Sachs模型向〈001〉-〈111〉方向转动.取向转动可以导致Schmid因子的增大或减小.实验结果说明,晶粒取向的转动行为受邻近晶粒的取向、变形行为影响.
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