Large deformability of Mg alloys produced by confinement to the nanoscale in one dimension
Large deformability of Mg alloys produced by confinement to the nanoscale in one dimension
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DOI：
10.1080/09500839.2020.1783008
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发表时间：
2020-06
影响因子：
1.2
通讯作者：
S. Gong;J. Wiezorek;M. Shankar
中科院分区：
文献类型：
--
作者：
S. Gong;J. Wiezorek;M. Shankar
摘要我们报告了一个过渡到大应变，多滑移塑性镁合金的变形几何形状的一个单一的维度细化到100 nm尺度。基底滑移为主的应变局部化和断裂被抑制，并且当一个特征尺寸在不对称楔形压痕中被细化时，即使当其他两个尺寸保持宏观时，在环境温度下实现大于200%的剪切应变。在亚临界尺度的低维这里发现的延展性是独立的晶体取向，和界面和大的剪切应变导致在这些条件下变形的材料中的均匀的纳米结晶。
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.