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Wang, Lihua; Zhang, Yin; Zeng, Zhi; Zhou, Hao; He, Jian; Liu, Pan; Chen, Mingwei; Han, Jian; Srolovitz, David J; Teng, Jiao; Guo, Yizhong; Yang, Guo; Kong, Deli; Ma, En; Hu, Yongli; Yin, Baocai; Huang, XiaoXu; Zhang, Ze; Zhu, Ting; Han, Xiaodong
Science (American Association for the Advancement of Science), 2022-Mar-18, 2022-03-18, 20220318, Letnik: 375, Številka: 6586Journal Article
Grain boundaries (GBs) play an important role in the mechanical behavior of polycrystalline materials. Despite decades of investigation, the atomic-scale dynamic processes of GB deformation remain elusive, particularly for the GBs in polycrystals, which are commonly of the asymmetric and general type. We conducted an in situ atomic-resolution study to reveal how sliding-dominant deformation is accomplished at general tilt GBs in platinum bicrystals. We observed either direct atomic-scale sliding along the GB or sliding with atom transfer across the boundary plane. The latter sliding process was mediated by movements of disconnections that enabled the transport of GB atoms, leading to a previously unrecognized mode of coupled GB sliding and atomic plane transfer. These results enable an atomic-scale understanding of how general GBs slide in polycrystalline materials.
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