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Dislocation-stacking fault interactions in a nanostructured Al alloy processed by severe plastic deformation

机译：严重塑性变形处理的纳米结构铝合金中位错-堆垛层错相互作用

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Experimental observations on dislocation-stacking fault (SF) interactions in nanostructured (NS) Al and Al alloys have received very limited attention albeit some available theoretical studies using molecular dynamic simulations in the published scientific literature; consequently, the effect of the SFs on strength and ductility remains poorly understood. In an effort to address this question, the present study reports a type of configurations comprising one or several full dislocation(s) and a SF in a NS Al alloy processed by high-pressure torsion. The configurations were identified and studied using high resolution transmission electron microscopy. The calculations reveal that the two partial dislocations enclosing the SF generate high magnitudes of components of stress in the position of the full dislocation(s), indicative of strong full dislocation-SF interactions. This finding suggests the potential of the SFs to enhance both strength and ductility of NS Al and Al alloys by impeding dislocation slip and entrapping dislocations.
机译：尽管已发表的科学文献中使用分子动力学模拟进行了一些可用的理论研究，但有关纳米结构（NS）Al和Al合金中位错-堆垛层错（SF）相互作用的实验观察受到的关注非常有限。因此，人们对SF对强度和延展性的影响知之甚少。为了解决这个问题，本研究报告了一种类型的构造，该构造包括通过高压扭转处理的NS Al合金中的一个或多个完全位错和SF。使用高分辨率透射电子显微镜对构型进行了鉴定和研究。计算结果表明，包围SF的两个局部位错在整个位错的位置产生了很大的应力分量，表明强烈的完全位错-SF相互作用。这一发现表明，SF可以通过阻止位错滑移和截留位错来增强NS Al和Al合金的强度和延展性。

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