Formation of dislocation channels in neutron irradiated molybdenum
Formation of dislocation channels in neutron irradiated molybdenum
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DOI：
10.1016/j.actamat.2016.09.029
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发表时间：
1973-04
期刊：
影响因子：
9.4
通讯作者：
S. Mahajan;B. Eyre
中科院分区：
文献类型：
--
作者：
S. Mahajan;B. Eyre
用透射电子显微镜研究了中子辐照钼中形变诱导位错通道的形成及位错环与位错的相互作用。这表明，辐照引起的缺陷-微结构是不稳定的应力。在应力的影响下，在空位和杂质共存的过渡区，环开始沿滑移柱滑移。结果表明，环-环的相互作用有一个显着的作用，在早期阶段的通道形成的位错没有看到无论是在内部或在胚胎通道的两端。环-环相互作用有两种结果：由于它们在局部区域中相互湮灭而导致的环密度的降低和由于具有相同性质的环的聚结而导致的环尺寸的增加。在进一步的应力作用下，较大环的节段可能成为移动的位错源。当应力水平足够高以激活聚结产生的滑动源时，可能会发生屈服。此外，有吸引力的环位错相互作用的结果表明，他们可能不会有一个显着的作用，在消除缺陷集群。另一方面，排斥相互作用可能在改变辐照金属的微观结构中起重要作用。
The formation of deformation-induced dislocation channels in neutron irradiated molybdenum and the loop-dislocation interactions were investigated using transmission electron microscopy. It is suggested that the irradiation-induced defect - microstructure is unstable with respect to the stress. Under the influence of the stress, loops start gliding on their glide cylinders in transition region of a cascade where vacancies and interstitials may coexist. Results indicate that loop-loop interactions have a significant role in the early stage of channel formation; dislocations are not seen either within or at the ends of the embryonic channels. There are two consequences of loop-loop interactions: the reduction in the loop density due to their mutual annihilation in localized regions and the increase in the loop sizes due to the coalescence of loops having the same nature. On further stressing, the segments of the larger loops could serve as the source of mobile dislocations. The yielding may occur when the stress level is high enough to activate the coalescence-produced glide sources. Furthermore, results on the attractive loop-dislocation interactions suggest that they may not have a significant role in eliminating defect clusters. On the other hand, the repulsive interactions may have a substantial role in altering the microstructure of the irradiated metals.