Elongated lamellar bands parallel to rolling plane are usually formed in γ-fiber of TaW alloys at high strains. However, in this study, a type of lamellar bands oriented with α-fiber is formed in Ta10 W alloy cold-rolled to 5%. Meanwhile, island equiaxed grains with special orientations can be seen in the lamellar bands. Furthermore, the lamellar bands are not homogenously distributed in the whole samples and concentrated in some elongated-grain bands. Although the lamellar bands are composed of extending planar dislocation boundaries with one or two dislocation cells across, they cannot result from incremental rotation of microbands or microshear bands, since no shear bands appear in these lamellar bands at such low strain. Therefore, the lamellar bands can be initiated by the retained elongated lamellar boundaries after annealing. They show a persistent microstructural feature as the ratio of reduction increases. As the hardness and dislocation density of the persistent lamellar bands is quite different from that of other deformed microstructures, these bands are bad for plastic deformation process. Meanwhile, protrusions at high-angle lamellar boundaries migrating to the recovered lamellar bands are observed during annealing because of the inhomogeneous dislocation microstructure. The lamellar bands can be fully eliminated when the annealing temperature reaches 1500 °C.

通常在高应变下在Ta W合金的γ纤维中形成平行于轧制平面的细长层状带。然而，在这项研究中，在Ta中形成了一种以α纤维取向的层状带10 W合金冷轧至5％。同时，在层状带中可以看到具有特殊取向的岛等轴晶粒。此外，层状条带在整个样品中不是均匀分布的，而集中在一些拉长的条带中。尽管层状带由延伸的平面位错边界和一个或两个位错单元构成，但是它们不能由微带或微剪切带的增量旋转引起，因为在这样的低应变下这些层状带中没有出现剪切带。因此，退火后，层状带可由保留的细长层状边界引发。随着还原率的增加，它们显示出持久的微观结构特征。由于永久性层状带的硬度和位错密度与其他变形的微结构完全不同，因此这些带不利于塑性变形过程。同时，由于位错微观结构不均匀，在退火过程中观察到大角度层状边界上的突起迁移到恢复的层状带。当退火温度达到1500°C时，可以完全消除层状带。