本文用高压电镜研究了Zr在高静液压下,挤压变形后形成的位错亚结构。在10％变形率下,位错以复杂二维纠结形态密集于(1010)活动滑移面上;到30％变形率时,发展为以这些活动滑移面为界面,间距0.5μm左右的平行片层结构。在1200MPa下挤压70％后,普遍形成形态清晰、界面位向差达3—5°以上的片层状亚晶群。亚晶群从其晶体学特征上分成两类:一类是在早期变形时形成的平行(1010)面的亚晶的基础上,进一步发展起来的倾侧型亚晶;另一类亚晶界面平行于基面(0001),并呈扭转晶界特征。后者比前者数量更多,厚度更小(0.1—0.3μm),但在较小变形量下不出现。通过与常规拉拔Zr的比较,可以肯定上述现象是静液挤压条件下形成的特殊的位错亚结构,高静液压对位错热激活运动的影响可以解释这种特殊亚结构的形成。
A TEM study was made of the dislocation substructures in Zr extruded under a high hydrostatic pressure. It was found in 10% extruded Zr that the dislocations densely assembled in certain regions on the primary active slip planes with a configuration of complicate tangling in two dimensions. Only after 30% extrusion, the cell-subgrains in a laminar structure with distinct interfaces appeared as a result of the development of special mentioned dislocation configuration. After heavily extruded under 12000 atm, the subgrains of less than 0.5μm width and apparent misorientation became extensive, which could be crystallographically divided into two types. The first is the developed subgrains parallel to (1010), occurring previously in earlier stage of deformation, the other, being more in quantity and thinner than the former, has the interfaces lying on the basal plane with typical twisting misorientation. The mentioned substructures have not been seen in conventionally drawn Zr used for comparison. Its formation can be interpreted from the point of view of the effect of high hydrostatic pressure on the thermal activation movement of dislocations.
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