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首页> 外文会议>Thirteenth International Symposium on Zirconium in the Nuclear Industry; Jun 10-14, 2001; Annecy, France >Activated Slip Systems and Localized Straining of Irradiated Zr Alloys in Circumferential Loadings
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Activated Slip Systems and Localized Straining of Irradiated Zr Alloys in Circumferential Loadings

机译：周向载荷下活化的滑动系统和辐照Zr合金的局部应变

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摘要

During the plastic deformation of irradiated Zr alloys, specific slip systems are activated. Indeed, the dislocation loops of type are strong obstacles for the dislocations gliding on the classical prismatic planes. An increase in yield strength is observed. This allows the activation of other slip systems. The basal slip, having a Burgers vector can interact with the irradiation-induced dislocation loops. This interaction leads to the annealing of the loops by various mechanisms and leads to the formation of dislocation free bands after limited plastic strain (channeling). TEM examinations of Zry-4 samples strained after irradiation have been performed. High density of basal slip has been observed on channels. With such a mechanism, the irradiated Zr alloys exhibit a strain-softening behavior for loading orientations allowing this kind of interaction. A modeling of the interaction between the gliding dislocations and the loops has been performed to analyze the channel formation kinetics. Fine element (FE) computation of strain-softening materials has shown strong effects on the plastic zone shape ahead of crack tips. The results are discussed, focusing on the impact of this behavior on the mechanical properties of irradiated cladding. Specific attention is given on hoop straining with respect to PCI, RIA, or axial splitting.
机译：在被辐照的Zr合金发生塑性变形期间，会激活特定的滑移系统。实际上，型的位错环是在经典棱柱面上滑动的位错的强大障碍。观察到屈服强度增加。这允许激活其他滑动系统。具有 Burgers向量的基底滑移可以与辐射诱导的位错环相互作用。这种相互作用导致通过各种机理使环退火，并导致在有限的塑性应变（通道化）之后形成位错自由带。辐照后拉紧的Zry-4样品的TEM检查已经完成。在通道上已观察到高密度的基底滑移。通过这种机制，被辐照的Zr合金在载荷取向方面表现出应变软化行为，从而允许这种相互作用。进行了滑脱位错与环之间相互作用的建模，以分析通道形成动力学。应变软化材料的精细元素（FE）计算已显示出对裂纹尖端之前的塑性区形状的强烈影响。讨论了结果，重点是这种行为对辐照熔覆层机械性能的影响。对于与PCI，RIA或轴向劈裂有关的箍紧应力给予了特别的关注。

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