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Superplasticity in Cold Nanowires through the Operation of Multiple Slip Systems

机译:通过多滑动系统的操作在冷纳米线中的超塑性

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摘要

Dislocation activity in metallic nanowires often causes shear localization and premature necking, resulting in an early fracture. Here, in situ nanomechanical testing reveals a strong orientation-dependent dislocation-mediated superplastic deformation in gold (Au) nanowires, with more than 100% uniform elongation achieved before the fracture of [111]-oriented nanowires. Such superplastic deformability of [111]-oriented Au nanowires originates from the close coordination of homogeneously activated dislocation events on the three equivalent slip planes, which effectively eliminates the dislocation-induced deformation localization in Au nanowires with other orientations. This work sheds new light on the dislocation plasticity in metallic nanostructures, and is of technological importance for designing metallic nanostructures and nanodevices with high reliability.
机译:金属纳米线中的位错活动通常会导致剪切局部化和过早的颈缩,从而导致早期断裂。在这里,原位纳米力学测试揭示了金(Au)纳米线中强烈的与方向有关的位错介导的超塑性变形,在[111]取向的纳米线断裂之前获得了100%以上的均匀伸长率。 [111]定向金纳米线的这种超塑性可变形性源自在三个等效滑移面上均匀激活的位错事件的紧密配合,从而有效地消除了以其他方向发生的位错诱导的变形局域化。这项工作为金属纳米结构中的位错可塑性提供了新的思路,对于设计具有高可靠性的金属纳米结构和纳米器件具有重要的技术意义。

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