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Thermally stable coherent domain boundaries in complex-structured Cr2Nb intermetallics |
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| Authors: | Wei Zhang Xingqiu Chen Liyuan Sheng Hengqiang Ye |
| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;2. Beijing National Center for Electron Microscopy, Tsinghua University, Beijing, China;3. Shenzhen Key Laboratory of Human Tissue Regeneration and Repair, Shenzhen Institute, Peking University, Shenzhen, China |
| Abstract: | The strength and hardness of nanostructured materials are significantly enhanced owing to the large amount of grain boundaries (GB) produced by a reduced grain size. The thermal stability of the GB is a key to maintaining the grain size and thus the strength/hardness in nanostructured materials at high temperatures. In this work, coherent domain boundaries (DB) were introduced by compressive processing to sub-divide a complex-structured intermetallic Cr2Nb into nanograins of size down to 2 nm. These DB persisted after an annealing of 10 h at 1273 K. The coherent DB have been investigated by aberration-corrected high-resolution transmission electron microscopy and first-principles calculations. The high thermal stability is evidently a result of low formation energies of the DB. |
| Keywords: | Nanostructured materials thermal stability domain structure atomic-resolution electron microscopy high-temperature materials Cr2Nb |