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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Atomistic understanding of deformation-induced heterogeneities in wire drawing and their effects on the tensile ductility of metallic glass wires
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Atomistic understanding of deformation-induced heterogeneities in wire drawing and their effects on the tensile ductility of metallic glass wires

机译：造型诱导的电线拉伸诱导异质性的原子理解及其对金属玻璃线拉伸延展性的影响

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摘要

Compared to crystalline metals, metallic glasses (MGs) show an exceptional feature of improved ductility after being mechanically processed by wire drawing. However, its underlying mechanisms have not yet been fully elucidated. In this study, with the aid of atomistic simulations, wire drawing and subsequent tensile loading were performed on MG nanowires to systematically investigate the deformation mechanisms of MGs in wire drawing, the deformation-induced heterogeneities and their influences on the tensile ductility. The results revealed that the deformation mechanisms of MGs in wire drawing are closely associated with the area reduction ratio (R): at a small R of 4.7%, the area reduction is realized via shear transformations of atoms near the surface, leaving the core intact; while at a large R of 9.3%, it relies on the formation of multiple spatially distributed shear bands that redistributes the plasticity throughout the sample. The deformation-induced heterogeneities were understood through the detailed analysis of the resultant residual strain and stresses, the gradient rejuvenated amorphous structures, the unique free volume distribution and spatially distributed shear bands. Moreover, the tensile simulations revealed improved ductility synchronized with decreased yield strength of the drawn samples. The improved ductility is attributed to the synergistic effects of three beneficial factors: 1) The surface compressive residual axial stress leads to a shift of the yield sites from the surface to the core, suppressing the rapid formation of shear bands; 2) The rejuvenated structures near the surface constrain and accommodate the plastic deformation in the core; 3) The spatially distributed shear bands, generated at large R, serve as heterogeneous nucleation sites for highly dispersed plastic shearing. The findings provide a comprehensive elucidation of the deformation-induced heterogeneities of MGs in wire drawing and establish a physical relationship between these heterogeneities and mechanical properties, which can serve to interpret the experimental results. (C) 2019 Elsevier B.V. All rights reserved.
机译：与结晶金属相比，金属玻璃（MGS）显示通过线材机械加工后改善延展性的特殊特征。但是，其潜在的机制尚未完全阐明。在本研究中，借助原子模拟，对Mg纳米线进行线材和随后的拉伸载荷，以系统地研究Mgs在线图中Mgs的变形机制，变形诱导的异质性及其对拉伸延展性的影响。结果表明，线材中Mgs的变形机制与面积减小比（R）密切相关：在4.7％的小r，通过表面附近的原子的剪切变换来实现面积减少，使核心完好无损;虽然以9.3％的r为9.3％，但它依赖于形成多个空间分布的剪切带，该剪切带重新分配了整个样品的可塑性。通过对所得残留应变和应力的详细分析，梯度恢复无定形结构，独特的自由体积分布和空间分布的剪切带，理解变形引起的异质性。此外，拉伸模拟显示出改善的延展性与拉伸样品的屈服强度降低同步。改进的延展性归因于三个有益因素的协同效应：1）表面压缩残余轴向应力导致产量从表面到芯的偏移，抑制剪切带的快速形成; 2）表面附近的恢复活力结构限制并容纳芯中的塑性变形; 3）在大R产生的空间分布的剪切带，用作高度分散的塑料剪切的异质成核位置。该研究结果提供了在线图中的变形诱导的Mgs的异质性阐明，并且在这些异质性和机械性能之间建立了物理关系，其可以用于解释实验结果。 （c）2019 Elsevier B.v.保留所有权利。

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