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首页> 外文期刊>Journal of Materials Research >Strategies to tailor serrated flows in metallic glasses
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Strategies to tailor serrated flows in metallic glasses

机译：定制金属玻璃中锯齿状流的策略

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Serrated flow is one important characteristic of shear bands through which metallic glasses (MGs) accommodate plastic deformation. Serrated flow can be affected by intrinsic properties such as elastic modulus or extrinsic variables such as strain rate. However, the influences of pre-deformation and interfaces on serrated flow are less well understood. In this study, by using in situ micropillar compression inside a scanning electron microscope, we show that pre-deformation (consisting of cyclic loading/unloading below the nominal elastic limit) suppresses serrated flows in amorphous-CuNb but enhances serrated flows in amorphous-CuZr at both high and low strain rates. Moreover, layer interfaces in Cu/amorphous-CuNb multilayers mitigate serrated flows, and the average stress drop and strain duration associated with shear banding process can be tailored. Strain accommodation and energy dissipation via shear banding have clear impact on serrated flows. This study provides new perspectives on tailoring serrated flows and enhancing plastic deformation of MGs.
机译：锯齿状流是剪切带的一个重要特征，金属玻璃（MGs）通过剪切带适应塑性变形。锯齿状流会受到诸如弹性模量的固有属性或诸如应变率的外部变量的影响。然而，人们对变形和界面对锯齿状流动的影响了解得很少。在这项研究中，通过在扫描电子显微镜内部使用原位微柱压缩，我们显示出预变形（由低于标称弹性极限的循环加载/卸载组成）抑制了非晶态CuNb中的锯齿状流动，但增强了非晶态CuZr中的锯齿状流动。在高应变率和低应变率下。此外，Cu /非晶态CuNb多层体中的层界面可减轻锯齿状流动，并且可以定制与剪切带过程相关的平均应力降和应变持续时间。应变调节和通过剪切带的能量消散对锯齿状流有明显影响。这项研究为剪裁锯齿流和增强MG的塑性变形提供了新的见解。

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