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本文利用弱束暗场技术显示了08F铜经50％室温形变后,560℃加热10小时晶粒处于回复状态时,亚晶界的位错网络。结果表明:α-Fe经形变回复后,亚晶界位错成规则整齐的排列。明场象中虽能见到位错的规则排列,但位错线细节不够清楚(见图a);而弱束暗场象则清晰地显示出亚晶界位错网络的各种形态(见图b、c、d),位错线的象宽度降低到20～30A,充分显示了弱束暗场技术在复杂位错网络显示中的特殊作用。根据弱束成象时,衍射花样中菊池线的位置计算了偏移参量|sg|,结果表明,用g=110成弱
In this paper, the weak-beam dark-field technique is used to show the dislocation networks of subgrain boundaries when the 08F copper is deformed by 50% room temperature and heated at 560 ℃ for 10 hours. The results show that the dislocations of the subgrain boundaries are regularly and neatly arranged after the α-Fe is restored by deformation. Although the dislocation regular arrangement can be seen in the bright field images, the details of the dislocation lines are not clear enough (see Figure a). The weak beam dark field images clearly show the various forms of dislocation networks in the subgrain boundaries b, c, d), the width of the dislocation line is reduced to 20-30A, which shows the special effect of the weak beam dark field technique in the complex dislocation network display. According to the weak beam imaging, the offset parameter | sg | is calculated by the position of the Kikuchi line in the diffraction pattern, and the result shows that it becomes weak with g = 110