Understanding nanoscale damage at a crack tip of multilayered metallic composites

Understanding nanoscale damage at a crack tip of multilayered metallic composites
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了解多层金属复合材料裂纹尖端的纳米级损伤

DOI:
10.1063/1.2913155
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发表时间:
2008-04
影响因子:
4
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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通过定量聚焦离子束截面表征技术,我们直接观察到在拉伸载荷作用下,纳米层状Cu/Ta复合材料在裂纹尖端的塑性变形区发生了从几纳米到几十纳米的剪切位移。最终导致了铜/钽层压复合材料的剪切断裂。通过对纳米层状金属复合材料界面势垒强度的理论分析,发现了一个临界的单层厚度,低于该厚度,纳米层状复合材料的断裂性质往往是剪切破坏。(C)2008年美国物理研究所。
Through quantitative focused ion beam cross-sectional characterization technique, we directly observed shear displacement in a range from several nanometers to a few tens of nanometers occurring in the plastic deformation zone ahead of a crack tip in nanolayered Cu/Ta composite subjected to tensile load. As a result, shear-mode fracture of the Cu/Ta laminate composite was eventually caused. A theoretical analysis of the interface barrier strength of nanolayered metallic composites here and reported in literature finds a critical individual layer thickness below which the nature of fracture of the nanolayered composites tends to be shearing failure. (c) 2008 American Institute of Physics.
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