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首页> 美国卫生研究院文献>Scientific Reports >Crystallization-aided extraordinary plastic deformation in nanolayered crystalline Cu/amorphous Cu-Zr micropillars
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Crystallization-aided extraordinary plastic deformation in nanolayered crystalline Cu/amorphous Cu-Zr micropillars

机译：纳米晶体Cu /非晶Cu-Zr微柱中的结晶辅助超常塑性变形

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摘要

Metallic glasses are lucrative engineering materials owing to their superior mechanical properties such as high strength and great elastic strain. However, the Achilles' heel of metallic amorphous materials — low plasticity caused by instantaneous catastrophic shear banding, significantly undercut their structural applications. Here, the nanolayered crystalline Cu/amorphous Cu-Zr micropillars with equal layer thickness spanning from 20–100 nm are uniaxially compressed and it is found that the Cu/Cu-Zr micropillars exhibit superhigh homogeneous deformation (≥ 30% strain) rather than localized shear banding at room temperature. This extraordinary plasticity is aided by the deformation-induced devitrification via absorption/annihilation of abundant dislocations, triggering the cooperative shearing of shear transformation zones in glassy layers, which simultaneously renders the work-softening. The synthesis of such heterogeneous nanolayered structure not only hampers shear band generation but also provides a viable route to enhance the controllability of plastic deformation in metallic glassy composites via deformation-induced devitrification mechanism.
机译：金属玻璃由于其优越的机械性能（例如高强度和大弹性应变）而成为有利可图的工程材料。但是，金属非晶态材料的致命弱点–由瞬时灾难性剪切带引起的低塑性，大大削弱了其结构应用。在这里，纳米层结晶的Cu /非晶Cu-Zr微柱的层厚在20-100 nm之间，被单轴压缩，发现Cu / Cu-Zr微柱表现出超高的均匀变形（≥30％应变），而不是局部的在室温下剪切带。通过大量位错的吸收/ an灭，变形引起的失透会帮助这种非凡的可塑性，从而触发玻璃状层中剪切转变区的协同剪切，同时使工作变软。这种异质纳米层结构的合成不仅阻碍了剪切带的产生，而且提供了一条可行的途径，通过变形诱导的失透机理来增强金属玻璃态复合物中塑性变形的可控制性。

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