Interaction and accumulation of glissile defect clusters near dislocations
Interaction and accumulation of glissile defect clusters near dislocations
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DOI：
10.1016/s0022-3115(99)00176-2
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发表时间：
2000
影响因子：
3.1
通讯作者：
N. Ghoniem;B. N. Singh;Lizhi Sun;T. D. D. L. Rubia-T.-D.-D.-L.-Rubia-2063021094
中科院分区：
文献类型：
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作者：
N. Ghoniem;B. N. Singh;Lizhi Sun;T. D. D. L. Rubia-T.-D.-D.-L.-Rubia-2063021094
滑移位错附近纳米尺寸的棱柱形缺陷团的积累是由于它们之间的相互弹性作用。我们在这里提出了辐射诱导纳米尺寸棱镜环和生长位错环之间相互作用能的3-D各向同性弹性计算。目前的治疗方法在两个方面扩展了Trinkaus等人的工作。首先，发展了一种计算方法，对体心立方结构的Fe和面心立方结构的Cu的相互作用能进行全三维分析。其次，Kroupa的理论方法计算实施严格的计算力，扭矩和诱导表面能的缺陷团簇。结果表明，在室温下，在bcc Fe中，小团簇被捕获在约10 nm的区域内，在fcc Cu中，小团簇被捕获在约20 nm的区域内，与实验观察大致一致。团簇可以被吸收在生长在位错的核心，因为不平衡的时刻，这提供了足够的能量旋转的伯格斯矢量在2-3 nm的区域中的Fe。在位错核心附近（在几个纳米内），铜中的固着缺陷簇被示出转换为滑动配置。
Accumulation of nano-size prismatic defect clusters near slip-dislocations results from their mutual elastic interaction. We present here 3-D isotropic elasticity calculations for the interaction energy between radiation-induced nano-size prismatic loops and grown-in dislocation loops. The current treatment extends the work of Trinkaus et al. in two respects. First, a computational method for full 3-D analysis of interaction energies in bcc Fe and fcc Cu is developed. Second, the theoretical method of Kroupa is computationally implemented for rigorous calculations of force, torque and induced surface energy on defect clusters. It is shown that small clusters are trapped within a zone of ∼10 nm in bcc Fe, and ∼20 nm in fcc Cu at room temperature, in rough agreement with experimental observations. Clusters can be absorbed in the core of grown-in dislocations because of unbalanced moments, which provide sufficient energy for rotation of their Burgers vectors in a zone of 2–3 nm in Fe. Near the dislocation core (within a few nanometers), sessile defect clusters in Cu are shown to convert to a glissile configuration.