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Experimental characterization of shear transformation zones for plastic flow of bulk metallic glasses

机译：大块金属玻璃塑性流动的剪切转变区的实验表征

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摘要

We report experimental characterization of shear transformation zones (STZs) for plastic flow of bulk metallic glasses (BMGs) based on a newly developed cooperative shearing model [Johnson WL, Samwer K (2005) A universal criterion for plastic yielding of metallic glasses with a (T/T_g)~(2/3) temperature dependence. Phys Rev Lett 95:195501]. The good agreement between experimental measurements and theoretical predictions in the STZ volumes provides compelling evidence that the plastic flow of metallic glasses occurs through cooperative shearing of unstable STZs activated by shear stresses. Moreover, the ductility of BMGs was found to intrinsically correlate with their STZ volumes. The experiments presented herein pave a way to gain a quantitative insight into the atomic-scale mechanisms of BMG mechanical behavior.
机译：我们基于新开发的合作剪切模型[Johnson WL，Samwer K（2005）通用的金属玻璃塑性屈服准则（（ T / T_g）〜（2/3）温度依赖性。 Phys Rev Lett 95：195501]。 STZ体积中的实验测量值与理论预测之间的良好一致性提供了令人信服的证据，表明金属玻璃的塑性流动是通过剪切应力激活的不稳定STZ的协同剪切而发生的。此外，发现BMG的延展性与其STZ体积内在相关。本文介绍的实验为获得对BMG机械行为的原子尺度机制的定量了解铺平了道路。

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