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首页> 外文期刊>Applied Physics Letters >Suppression of the shear band instability during plastic flow of nanometer-scale confined metallic glasses
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Suppression of the shear band instability during plastic flow of nanometer-scale confined metallic glasses

机译：抑制纳米级受限金属玻璃塑性流动过程中的剪切带不稳定性

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摘要

The shear band instability that occurs during plastic deformation of metallic glasses limits the application of these high-strength materials. We show that this instability can be suppressed in nanometer-scale metallic glasses constrained by ultrafine crystalline layers. Free-standing Cu/ amorphous Pd_(0.77)Si_(0.23) multilayers consisting either of 10/90 nm glass/Cu or 100/100 nm glass/Cu were deformed to layer thickness reductions greater than 75% by cold rolling or bending, respectively. Transmission electron microscopy showed uniform reduction in the layer thickness with no shear band formation in the amorphous layers. The mechanisms that allow homogeneous codeformation of metallic glasses with nanoscale crystalline layers at high stresses are discussed.
机译：金属玻璃塑性变形过程中发生的剪切带不稳定性限制了这些高强度材料的应用。我们表明，这种不稳定性可以在由超细晶体层约束的纳米级金属玻璃中得到抑制。由10/90 nm玻璃/ Cu或100/100 nm玻璃/ Cu组成的独立式Cu /非晶Pd_（0.77）Si_（0.23）多层通过冷轧或弯曲分别变形至厚度减少超过75％ 。透射电子显微镜显示在无定形层中层厚度均匀减小而没有剪切带形成。讨论了允许在高应力下具有纳米级晶体层的金属玻璃均匀共形的机制。

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