Structural heterogeneity governing deformability of metallic glass
Structural heterogeneity governing deformability of metallic glass
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DOI：
10.1016/j.matt.2023.01.016
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发表时间：
2023-02
期刊：
影响因子：
18.9
通讯作者：
Youran Hong;Han Wang;Xing Li;Li Zhong;Han-Ting Chen;Ze Zhang;P. Cao;R. Ritchie;Jiangwei Wang
中科院分区：
文献类型：
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作者：
Youran Hong;Han Wang;Xing Li;Li Zhong;Han-Ting Chen;Ze Zhang;P. Cao;R. Ritchie;Jiangwei Wang
金属玻璃的变形能力受其热机械加工历史的强烈影响，热机械加工历史决定了金属玻璃的能态和局部原子构型。在这里，我们揭示了单原子钽MG纳米线，定制的电脉冲，可以达到一个显着的范围内的变形能力，表现为液体状流动或脆性断裂。原子有序性水平上的结构不均匀性决定了单原子MG的塑性和变形转变。通过对应变过程中原子重排的跟踪，我们发现局部有序的弥散和稀疏分布与颈缩有关，而中程有序的逾渗限制了变形能力，导致脆性破坏。这项工作揭示了新的光在MG的结构与性能的关系，这具有重要意义的设计与可调的机械性能的纳米MG。
Deformability of metallic glasses (MGs) is strongly influenced by their thermomechanical processing history that governs their energy state and local atomic configurations. Here, we reveal that monatomic tantalum MG nanowires, tailored by electropulsing, can attain a remarkable range of deformability, manifesting as either liquid-like flow or brittle fracture. Inherent structural heterogeneity on the level of atomic order dominates the plasticity and deformation transition of monatomic MGs. By tracking atomic rearrangement during straining, we find the dispersive and sparse distribution of local order is associated with necking, yet percolation of medium-range order constrains the deformability and results in brittle failure. This work sheds new light on the structure-property relationships in MGs, which has important implications for the design of nanoscale MGs with tunable mechanical properties.