ABSTRACT We report a transition to large-strain, multi-slip plasticity in Mg alloys resulting from refinement of a single dimension of the deformation geometry to the ∼ 100 nm-scale. Basal-slip-dominated strain localisation and fracture is suppressed and shear strains greater than 200% are realised at ambient temperatures when one characteristic dimension is refined in an asymmetric wedge indentation, even when the other two dimensions remain macroscopic. The ductility at sub-critical scales of low dimensionality discovered here is independent of crystal orientation, and interfaces and large shear strains result in homogeneous nanocrystallinity in the deformed material under these conditions.

中文翻译：

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通过一维纳米尺度限制生产的镁合金的大变形能力

摘要 我们报告了 Mg 合金向大应变、多滑移塑性的转变，这是由于将变形几何的单一维度细化到 100 nm 尺度所致。当在非对称楔形压痕中细化一个特征尺寸时，即使其他两个尺寸保持宏观，也可以抑制基底滑动主导的应变局部化和断裂，并且在环境温度下实现大于 200% 的剪切应变。这里发现的低维亚临界尺度的延展性与晶体取向无关，界面和大剪切应变在这些条件下导致变形材料中的均匀纳米结晶。