Bulk Metallic Glasses Deform via Slip Avalanches
Bulk Metallic Glasses Deform via Slip Avalanches
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DOI：
10.1103/physrevlett.112.155501
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发表时间：
2014-04-14
影响因子：
8.6
通讯作者：
Dahmen, Karin A.
中科院分区：
文献类型：
--
作者：
Antonaglia, James;Wright, Wendelin J.;Dahmen, Karin A.
根据一个简单的平均场模型，首次在金属玻璃中提取了描述慢变形过程中滑移事件的性质、统计和动力学的指数和标度函数。我们将滑移模拟为耦合剪切变换区(STZ)中原子重排的雪崩。使用高时间分辨率的测量，我们找到了预测的、不同的统计和动力学对于小的和大的滑动，从而排除自组织临界性。许多独立测量的模型和数据之间的一致性提供了证据，证明STZ的滑移雪崩是金属玻璃中不均匀变形的基本机制。
For the first time in metallic glasses, we extract both the exponents and scaling functions that describe the nature, statistics, and dynamics of slip events during slow deformation, according to a simple mean field model. We model the slips as avalanches of rearrangements of atoms in coupled shear transformation zones (STZs). Using high temporal resolution measurements, we find the predicted, different statistics and dynamics for small and large slips thereby excluding self-organized criticality. The agreement between model and data across numerous independent measures provides evidence for slip avalanches of STZs as the elementary mechanism of inhomogeneous deformation in metallic glasses.