Abstract Stabilizing deformation within defect-scarce nanowires, which feature dislocation nucleation-mediated strengths, is experimentally challenging due to the high elastic strain energy that dissipates at ultrahigh rates at the onset of plastic deformation. Here, frame stiffness-enhanced in situ tensile tests were perform on defect-scarce nanowires, where the tensile deformation response of the nanowires is measured by local strain analyses. The influence of frame stiffness on incipient plasticity is evaluated by an energy criterion that considers the energy release rate during the incipient plastic event, which gives rise to a condition for stable plasticity. Without altering the underlying deformation mechanism, the presented results demonstrate that the ductility of defect-scarce nanowires can be substantially extended. As a consequence, the full evolution of plastic deformation within defect-scarce nanowires is captured, which include observations of local yield events and the propagation of plasticized zones.

中文翻译：

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通过控制初始塑性过程中的能量释放速率来抑制缺陷稀缺纳米线的不稳定性

摘要 由于在塑性变形开始时以超高速率耗散的高弹性应变能，在具有位错成核介导强度的缺陷稀缺纳米线内稳定变形在实验上具有挑战性。在这里，对缺陷稀缺的纳米线进行了框架刚度增强的原位拉伸测试，其中纳米线的拉伸变形响应是通过局部应变分析来测量的。框架刚度对初始塑性的影响通过考虑初始塑性事件期间的能量释放率的能量准则进行评估，这产生了稳定塑性的条件。在不改变潜在变形机制的情况下，所呈现的结果表明缺陷稀缺纳米线的延展性可以得到显着扩展。作为结果，