Observations of Dislocations in Cu/Nb Nanolayer Composites After Deformation
Observations of Dislocations in Cu/Nb Nanolayer Composites After Deformation
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Cu/Nb 纳米层复合材料变形后位错的观察
DOI：
10.1557/jmr.1997.0264
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Mitchell
中科院分区：
文献类型：
--
作者：
Y. Lu;H. Kung;A. Griffin;M. Nastasi;T. Mitchell
在波长 17 和 7 nm 的变形 Cu/Nb 纳米层复合材料中观察到位错。即使 Burgers 矢量发生变化，位错也会穿过 Cu/Nb 界面。传统和高分辨率透射电子显微镜研究表明，Cu层中这些位错的面内弯曲方向与Nb层中的相反，因此位错呈现锯齿状。这些观察结果可以通过铜中残余拉应力和铌中残余压应力的存在来解释，这使得位错在交替层中沿相反方向弯曲。
Dislocations have been observed in deformed Cu/Nb nanolayer composites of wavelength 17 and 7 nm. The dislocations thread through the Cu/Nb interfaces even though there is a change of Burgers vector. Conventional and high resolution transmission electron microscopy studies show that the in-plane bowing direction of these dislocations in the Cu layers is opposite to that in the Nb layers, so that the dislocations appear to zig-zag. These observations are explained by the presence of residual tensile stresses in Cu and residual compressive stresses in Nb, which make dislocations bow in opposite directions in the alternating layers.