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The new results of the team of Academician Tian Yongjun of Yanshan University are published in Nature again: room temperature structural transformation and migration of diamond interface
2024-01-16 09:01:38
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On January 4, 2024, Beijing time, Nature magazine published online the latest results of the team of Academician Tian Yongjun of the High Voltage Science Center of the State Key Laboratory of Metastable Materials Preparation Technology and Science at Yanshan University. Researchers systematically characterized multiple atomic-level configurations coexisting on Σ3{112}/<110>incoherent twin boundaries in nanotwinned diamond and recorded in situ the dislocation-mediated interface at room temp
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In nanotwin materials with face-centered cubic structure or diamond structure, Σ3{112}/<110>incoherent twin boundary (ITB) is a common interface. In metals, this interface will migrate rapidly when the twin thickness is lower than a certain critical value, inducing the detwinization process, which is also the key reason for the softening of metal materials with nanotwin structures. Unlike metal materials, nanotwinned cubic boron nitride and nanotwinned diamond do not soften as the twins are further refined, and the hardness of the materials continues to increase. This shows that Σ3{112} ITB has high stability in covalent materials that is very different from that of metal systems. Exploring the structural origin of this high stability is of great significance for understanding the continuous hardening mechanism of nanotwinned diamond and developing high-performance nanotwinned structural materials.
This research work was supported by the National Natural Science Foundation, the National Key Research and Development Program, the Hebei Provincial Natural Science Foundation and other projects.
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