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Dislocation characterization in fatigued Cu with nanoscale twins

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Abstract

Previous studies have shown that strain-controlled cyclic stability was maintained in bulk Cu samples with highly oriented nanoscale twins. In order to explore the underlying fatigue mechanism, transmission electron microscopy observations under two-beam diffraction condition were utilized to characterize the dislocation configurations in the twin/matrix layers of as-fatigued nanotwinned Cu. It was clarified that the threading dislocations with Burgers vector parallel to twin boundaries are mainly active during fatigue. A three-dimensional stereo projection was re-configured for demonstrating the special structure of dislocations in nanoscale twins.

中文摘要

块体择优取向纳米孪晶Cu在应变疲劳时保持循环稳定. 为了研究其本征疲劳机制, 本文利用透射电子显微镜在双束条件下 研究了纳米孪晶Cu疲劳后孪晶片层内位错形貌特征. 结果表明纳米孪晶Cu的疲劳变形多由受限于孪晶片层内部的滑移方向平行于孪晶界面、 滑移面倾斜于孪晶界面的单滑移贯穿位错主导. 通过三维投影模型重构了贯穿位错在纳米孪晶片层内的空间分布.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Qingsong Pan & Lei Lu

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  1. Qingsong Pan
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  2. Lei Lu
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Correspondence to Lei Lu.

Additional information

Qingsong Pan received his PhD degree in materials physics and chemistry at the Institute of Metal Research, Chinese Academy of Sciences, in 2014, and joined Professor Lei Lu’s group as an assistant professor. His research focuses on the fati gue behavior of nanotwinned metals.

Lei Lu is a professor at Shenyang National Laboratory for Materials Science at the Institute of Metal Research, Chinese Academy of Sciences. She is the member of International Community of Nanostructured Materials. Her research is focused on the fundamental study of the synthesis, microstructure characteristic and mechanical properties of nanostructured metallic materials. She authored and co-authored more than 80 international journal publications (including Science, Nature, Acta Mater, etc.) with total citations exceeding 5500.

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Pan, Q., Lu, L. Dislocation characterization in fatigued Cu with nanoscale twins. Sci. China Mater. 58, 915–920 (2015). https://doi.org/10.1007/s40843-015-0104-8

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  • DOI: https://doi.org/10.1007/s40843-015-0104-8

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