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本文用超高压电镜(JEM—1000型)研究了两种静液挤压钼(变形率ε=58％和68％)的组织、及其在退火后的变化。并与相同条件下的热旋锻钼作了对比。研究表明,静液挤压钼具有边界清晰、细长的亚晶粒带状组织(亚带组织)。该亚带的宽度在0.2～0.8微米之间。使这种组织的钼在氢气炉中,分别于950℃、1050℃、1240℃及1500℃加热30分钟退火处理,再观察,发现:在1050℃时,还保留有一部份变形组织,在1240℃时,亚带组织基本上消失,到1500℃时,就完全再结晶。对变形率58％的静液挤压钼,在高压电镜内,加热800℃保温40分钟后,原位法观察,发现亚带组织基本上未变,但在原来的亚带边界附近,看到清晰的等厚干涉条纹,说明形成了新的、细小亚晶粒。
In this paper, the microstructures of two hydrostatic extruded molybdenum (deformation rates ε = 58% and 68%) and their changes after annealing were studied by means of EHT (JEM-1000). And compared with hot-swirled molybdenum under the same conditions. Studies have shown that hydrostatic extruded molybdenum has well-defined, elongated subgrain ribbons (sub-banding). The width of this subband is between 0.2 and 0.8 microns. The molybdenum in such a structure was annealed in a hydrogen furnace at 950 ° C, 1050 ° C, 1240 ° C and 1500 ° C for 30 minutes, respectively, and then observed. It was found that at 1050 ° C, a part of the deformed structure was retained, ℃, the sub-band organization basically disappeared, to 1500 ℃, it completely recrystallized. Hydrostatic extrusion of molybdenum 58% deformation rate, in the high-pressure electron microscope, heating 800 ℃ incubated for 40 minutes, in situ observation and found that the sub-band organization basically unchanged, but in the vicinity of the original sub-band boundaries, see Clear, uniform thickness interference fringes, indicating the formation of new, small subgrains.