Enhancing the plasticity of metallic glasses: Shear band formation, nanocomposites and nanoglasses investigated by molecular dynamics simulations
Enhancing the plasticity of metallic glasses: Shear band formation, nanocomposites and nanoglasses investigated by molecular dynamics simulations
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DOI：
10.1016/j.mechmat.2013.06.004
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发表时间：
2013-12-01
影响因子：
3.9
通讯作者：
Sopu, Daniel
中科院分区：
文献类型：
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作者：
Albe, Karsten;Ritter, Yvonne;Sopu, Daniel
我们调查的各种微观结构特征的变形行为的二元Cu 64 Zr 36玻璃的分子动力学计算机模拟的影响，并讨论如何以及为什么建立了非常相同的修改，以提高晶体材料的强度，即插入的溶质，沉淀物和晶界，可用于调整金属玻璃的机械性能。首先，通过测试散装样品，在拉伸载荷下，没有开放的表面，我们表明，剪切变形区到剪切带的冷凝可以发生作为非均质的，但也作为一个均匀的成核过程。然后，研究了结晶纳米沉淀物对剪切带成核和传播的影响。最后，我们研究了晶粒尺寸和成分对纳米玻璃和纳米玻璃复合材料变形行为的影响。结果表明，玻璃-玻璃界面作为结构的不均匀性，促进剪切带的形成和防止应变局部化。(C)2013爱思唯尔有限公司保留所有权利。
We investigate the influence of various microstructural features on the deformation behavior of binary Cu64Zr36 glasses by molecular dynamics computer simulations and discuss how and why the very same modifications established for enhancing the strengths of crystalline materials, namely the insertion of solutes, precipitates and grain boundaries, can be used for tuning the mechanical properties of metallic glasses. First, by testing bulk samples with and without open surfaces under tensile load, we show that the condensation of shear transformation zones into shear bands can occur as heterogeneous but also as a homogeneous nucleation process. Then, the influence of crystalline nanoprecipitates on shear band nucleation and propagation is investigated. Finally, we study the effect of grain size and composition on the deformation behavior of nanoglasses and nanoglass composites. The results reveal that glass-glass interfaces act as structural heterogeneities,which promote shear band formation and prevent strain localization. (C) 2013 Elsevier Ltd. All rights reserved.