The transition behavior of coarse AlN during cold rolling in the low-temperature grain-oriented silicon steel normalized sheet was investigated using field emission scanning electron microscopy (SEM) and field emission transmission electron microscopy (TEM). The SEM observation results showed that the size of AlN decreased with the increase of the cold rolling reduction rate, and the average sizes of AlN in the normalized specimen and the cold-rolled specimens with the cold rolling reduction rates of 14%, 23%, 30%, 40%, and 89% were approximately 1734, 771, 742, 582, 490, and 96 nm, respectively. The morphology of AlN nearly transformed from rectangle to irregular polygon when the cold rolling reduction rate exceeded 23%. Meanwhile, the mechanism of the refinement of AlN during cold rolling was characterized by TEM. The high-resolution transmission electron microscopy (HRTEM) analysis results confirmed that the refinement of coarse AlN during cold rolling was caused by the shear effect of dislocation slip because lots of slip traces, which were produced by dislocation slip along some slip systems of AlN, such as (01$\bar{1}$0)[2$\bar{1}\bar{1}$0], (0$\bar{1}$11)[2$\bar{1}\bar{1}$0], and (0001)[2$\bar{1}\bar{1}$0] slip systems, were observed in AlN. Moreover, it was also found that after a coarse AlN was sheared to become two parts, the orientations of them would be slightly different when the slip plane of AlN was not completely parallel to that of the matrix before shearing. Therefore, based on these results, it was confirmed for the first time that the coarse AlN precipitated in low-temperature grain-oriented silicon steel normalized sheet was shearable and could be refined after cold rolling. The possible mechanisms were summarized as follows: the orientation relationship between AlN and matrix might be randomly changed during cold rolling owing to the considerable stress concentration around AlN, making it possible that the slip plane of AlN matched with that of the matrix, at this time, the dislocations slipping in the matrix could glide into and shear AlN with the slip system of matrix changing into the slip system of AlN.

利用场发射扫描电子显微镜（SEM）和场发射透射电子显微镜（TEM）研究了低温取向晶粒硅钢正火板冷轧过程中粗AlN的过渡行为。SEM观察结果表明，AlN的尺寸随冷轧压下率的增加而减小，而规范化试样和冷轧压下率分别为14％，23％， 30％，40％和89％分别约为1734、771、742、582、490和96 nm。当冷轧压下率超过23％时，AlN的形貌几乎从矩形转变为不规则多边形。同时，用TEM表征了冷轧过程中AlN的细化机理。$\stackrel{〜}{\mathrm{1个}}$0）[2$\stackrel{〜}{\mathrm{1个}}\stackrel{〜}{\mathrm{1个}}$0]，（0$\stackrel{〜}{\mathrm{1个}}$11）[2$\stackrel{〜}{\mathrm{1个}}\stackrel{〜}{\mathrm{1个}}$0]和（0001）[2$\stackrel{〜}{\mathrm{1个}}\stackrel{〜}{\mathrm{1个}}$[0]在AlN中观察到滑动系统。而且，还发现在将粗的AlN剪切成两部分之后，当AlN的滑动面不完全平行于剪切前的基体的滑动面时，它们的取向将略有不同。因此，基于这些结果，首次确认了在低温取向性硅钢正火板中析出的粗AlN是可剪切的，可以在冷轧后进行精制。可能的机理总结如下：由于冷轧中AlN周围相当大的应力集中，冷轧过程中AlN与基体之间的取向关系可能会随机改变，这使得此时AlN的滑移面与基体的滑移面匹配，