Abstract
We studied the fatigue crack growth (FCG) characteristics of bulk nanotwinned Cu (NT-Cu) with different microstructural aspects such as grain size and twin thickness. We specifically addressed the crack closure, with particular emphasis on the intrinsic FCG resistances in the near-threshold regime. The results demonstrate that the NT-Cu samples have significantly improved fatigue resistances compared with conventional twin-free polycrystalline Cu, a fact we measured using the effective threshold stress intensity factor range, ΔKth,eff. This enhanced resistance can be traced back to the activation of a specific set of primary slip systems in the NT-Cu, known as special trans-twin dislocation, which dominates the crack-tip cyclic deformation, leading to a diminished level of cyclical slip irreversibility and, in turn, enhancing the inherent resistance to damage propagation.
摘要
本文研究了具有不同微观结构(如晶粒尺寸和孪晶厚度)的块体择优取向纳米孪晶Cu(NT-Cu)的疲劳裂纹扩展(FCG)特性, 着重讨论了裂纹闭合效应和近门槛值区域的本征FCG阻力. 与传统无孪晶的粗晶Cu相比, NT-Cu样品表现出显著提升的疲劳裂纹扩展抗力(有效门槛值应力强度因子范围, ΔKth,eff). 这种增强的裂纹扩展阻力与NT-Cu中特殊的跨孪晶位错滑移模式有关. 该位错主导着NT-Cu裂纹尖端的循环变形, 有效降低了裂纹尖端循环滑移不可逆水平, 从而提高了纳米孪晶材料损伤扩展的本征抗力.
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Acknowledgements
Lu L acknowledges the financial support by the National Natural Science Foundation of China (NSFC, 51931010 and 92163202) and the Key Research Program of Frontier Science and International partnership program (GJHZ2029).
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Author contributions Lu L designed and supervised the project; Zhao R and Zhao H performed the experiments. All authors analyzed the data, discussed the results and wrote the paper.
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Ruike Zhao is currently a PhD student under the supervision of Professor Lei Lu at the Institute of Metal Research, Chinese Academy of Sciences (CAS), China. He received his Bachelor degree from Northeastern University, China, in 2019.
Huaizhi Zhao received his PhD degree in materials physics and chemistry from the University of Science and Technology of China in 2022. He is currently a research scientist at the Institute of Fluid Physics, China Academy of Engineering Physics. His research focuses on the deformation and fracture behavior of bulk nanostructured metallic materials.
Lei Lu is a distinguished professor at Shenyang National Laboratory for Materials Science at Institute of Metal Research, CAS, China. Her research interests include the synthesis, microstructure design and characterization, plastic deformation, and mechanisms of heterogeneous nanostructured metallic materials. She is an editor for Acta Materialia and Scripta Materialia, and an associate editor for Science China Materials.
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Zhao, R., Zhao, H. & Lu, L. Superior fatigue crack growth resistance in bulk Cu with highly oriented nanotwins. Sci. China Mater. 66, 4251–4257 (2023). https://doi.org/10.1007/s40843-023-2622-1
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DOI: https://doi.org/10.1007/s40843-023-2622-1