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Title: Competition between shear localization and tensile detwinning in twinned nanowires
Authors: Yin, Sheng
Cheng, Guangming
Zhu, Yong
Gao, Huajian
Keywords: Science::Physics
Issue Date: 2020
Source: Yin, S., Cheng, G., Zhu, Y., & Gao, H. (2020). Competition between shear localization and tensile detwinning in twinned nanowires. Physical Review Materials, 4(2), 023603-. doi:10.1103/physrevmaterials.4.023603
Journal: Physical Review Materials
Abstract: Recently, a transition of deformation mechanism from localized dislocation slip to delocalized plasticity via an anomalous tensile detwinning mechanism has been discovered in bitwinned metallic nanowires (NWs) with a single twin boundary (TB) running parallel to the NW length. However, experiments showed that the anomalous tensile detwinning in most of bitwinned NWs does not propagate through the whole NW, which limits the NWs failure strain when compared to the twinning-induced superplasticity in single-crystalline NWs. An elusive but fundamentally important question is that what factors might affect the propagation of tensile detwinning in such bitwinned NWs. In addition, can this tensile detwinning mechanism be applied to other types of twinned NWs? Here, based on in situ transmission electron microscopy testing and molecular dynamics simulations, a competition between shear localization and tensile detwinning is identified. By dividing the tensile detwinning mechanism into two steps and investigating each step separately, it is found that the quality of a single-crystalline embryo formed during step one determines the succeeding detwinning propagation (step two) and the final plastic strain. Furthermore, this anomalous tensile detwinning mechanism is extended to other metallic NWs with multiple TBs running parallel to the length direction, such as asymmetric pentatwinned NWs and NWs with multiple parallel TBs. This work highlights the important role of detwinning in large plasticity in metallic NWs with different twin structures.
ISSN: 2475-9953
DOI: 10.1103/PhysRevMaterials.4.023603
Rights: © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review Materials and is made available with permission of American Physical Society (APS).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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