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首页> 外文期刊>Nanotechnology >Balancing strength, hardness and ductility of Cu64Zr36 nanoglasses via embedded nanocrystals
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Balancing strength, hardness and ductility of Cu64Zr36 nanoglasses via embedded nanocrystals

机译：通过嵌入式纳米晶体的平衡强度，硬度和延展性Cu64ZR36纳米烃的延展性

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摘要

Superplasticity can be achieved in nanoglasses but at the expense of strength, and such a loss can be mitigated via embedding stronger nanocrystals, i.e., forming nanoglass/nanocrystal composites. As an illustrative case, we investigate plastic deformation of Cu64Zr36 nanoglass/nanocrystalline Cu composites during uniaxial tension and nanoindentation tests with molecular dynamics simulations. With an increasing fraction of nanocrystalline grains, the tensile strength of the composite is enhanced, while its ductility decreases. The dominant interface type changes from a glass-glass interface to glass-crystal interface to grain boundary, corresponding to a failure mode transition from superplastic flow to shear banding to brittle intercrystal fracture, respectively. Accordingly, the indentation hardness increases continuously and strain localization beneath the indenter is more and more severe. For an appropriate fraction of nanocrystalline grains, a good balance among strength, hardness and ductility can be realized, which is useful for the synthesis of novel nanograined glass/crystalline composites with high strength, high hardness and superior ductility.
机译：超塑性可以在纳米杆状物中实现，但以牺牲强度为代价，并且可以通过嵌入更强的纳米晶体，即形成纳米晶/纳米晶体复合材料来减轻这种损失。作为说明性情况，我们研究了在单轴张力和分子动力学模拟中的单轴张力和纳米狭窄试验期间Cu64Zr36纳米烃/纳米晶Cu复合材料的塑性变形。随着纳米晶粒的增加，复合材料的拉伸强度增强，而其延展性降低。主导界面类型从玻璃玻璃接口改变到玻璃晶体接口到晶界，对应于从超塑性流动到剪切带的失效模式转变，分别为脆性肾间骨折。因此，压痕硬度连续增加，压痕下方的应变定位越来越严重。对于适当的纳米晶粒颗粒，可以实现强度，硬度和延展性之间的良好平衡，这对于合成具有高强度，高硬度和优异延性的新型纳米玻璃/结晶复合材料是有用的。

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