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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Correlations of Microstructure and TEM Observations of Plasticity in Metallic Nanolaminates
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Correlations of Microstructure and TEM Observations of Plasticity in Metallic Nanolaminates

机译：金属纳米层压板的微观结构和可塑性的TEM观察

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摘要

Nanolaminate materials exhibit increases in hardness and yield strength beyond those expected according to rule of mixtures calculations. Several models have been proposed to explain this enhancement of strength, but conclusive experimental verification is hindered by the complex interaction between ingrown defects, in-plane microstructure and compositional modulation. In this study, mechanisms of plastic deformation in nanolaminates are investigated by in situ TEM straining of epitaxial Cu/Ni nanolaminates grown on Cu (001) single crystal substrates. Two distinct types of deformation are observed. Initial plastic deformation is accommodated by motion of "Orowan" and threading dislocations in a uniform and random fashion. As the stress levels increase, fracture occurs creating a mixed mode crack. Subsequent observations suggest that intense plastic deformation occurs over many bilayers in the direction of crack growth, but is contained to within one or two bilayers in a direction normal to the crack faces.
机译：纳米层压材料的硬度和屈服强度增加超过了根据混合物计算法则所预期的。已经提出了几种模型来解释这种强度的增强，但是由于内生缺陷，平面内微观结构和成分调制之间的复杂相互作用，最终的实验验证受到了阻碍。在这项研究中，通过原位TEM应变生长在Cu（001）单晶衬底上的外延Cu / Ni纳米层压板，研究了纳米层压板的塑性变形机理。观察到两种不同类型的变形。最初的塑性变形通过“ Orowan”运动和螺纹错位以统一和随机的方式进行调节。随着应力水平的增加，会发生断裂，形成混合模式裂纹。随后的观察表明，在裂纹扩展方向上许多双层上都发生了剧烈的塑性变形，但在垂直于裂纹面的方向上，这种塑性变形被包含在一个或两个双层内。

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