用Eshelby四极子排列描述金属玻璃中的剪切带
Shear banding in metallic glasses described by alignments of Eshelby quadrupoles
摘要：
金属玻璃在低于玻璃化转变温度时发生的塑性形变导致剪切局部化形成剪切带。据信，剪切带起源于具有四极对称性的单个应力集中区。为了阐明剪切带形成的基本机制，使用透射电子显微镜对剪切带进行了微观结构研究。在这里，我们展示了一个特征签名存在于剪切带中的正弦密度变化的形式表现的证据。我们提出了一个解析解观察到的变形后的状态来自连续介质力学使用的四极应力场扰动的塑性事件对齐。由于我们观察到的三种不同类型的金属玻璃，跨越整个范围内的金属玻璃的特征性质的定性相似的功能，我们得出结论，报告的变形行为是通用的所有金属玻璃，因此具有深远的影响一般的非晶态固体的变形行为。
英文摘要：
Plastic deformation of metallic glasses performed well below the glass transition temperature leads to the formation of shear bands as a result of shear localization. It is believed that shear banding originates from individual stress concentrators having quadrupolar symmetry. To elucidate the underlying mechanisms of shear band formation, microstructural investigations were carried out on sheared zones using transmission electron microscopy. Here we show evidence of a characteristic signature present in shear bands manifested in the form of sinusoidal density variations. We present an analytical solution for the observed post-deformation state derived from continuum mechanics using an alignment of quadrupolar stress field perturbations for the plastic events. Since we observe qualitatively similar features for three different types of metallic glasses that span the entire range of characteristic properties of metallic glasses, we conclude that the reported deformation behavior is generic for all metallic glasses, and thus has far-reaching consequences for the deformation behavior of amorphous solids in general.
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