Elastic isotropy originating from heterogeneous interlayer elastic deformation in a Ti3SiC2 MAX phase with a nanolayered crystal structure
| Autor: | Tohru S. Suzuki, Masakazu Tane, Yuji Shirakami, Ruxia Liu, Koji Morita, Seiji Miura, Tohru Sekino, Lianmeng Zhang, Hajime Kimizuka, Yoshio Sakka, Ken Ichi Ikeda |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Isotropy 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Shear modulus Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites Crystallite Texture (crystalline) 0210 nano-technology Anisotropy Single crystal |
| Zdroj: | Journal of the European Ceramic Society. 41:2278-2289 |
| ISSN: | 0955-2219 |
| Popis: | The elastic properties of a single-crystalline Ti3SiC2 MAX phase with a nanolayered crystal structure, comprising Ti-Si and two distinct Ti-C bonding layers, that had remained unclear because of the difficulty in growing large single crystals, were studied. Rather than unavailable large single crystals, polycrystalline samples with a crystallographic texture were prepared. By analyzing the polycrystalline elastic constants on the basis of an inverse Voigt–Reuss–Hill approximation, the elastic properties of a single crystal Ti3SiC2 with a hexagonal symmetry were determined. This revealed that the single-crystalline Young's modulus was almost isotropic despite its highly anisotropic layered structure. The shear modulus for (0001) 〈 11 2 ¯ 0 〉 was higher than that for {11 2 ¯ 0}[0001] in contrast to the basal slip-dominated plastic deformation reflecting the layered structure. Furthermore, first-principles calculations revealed that heterogeneous interlayer elastic deformation caused by the stabilization of Ti-Si bonding is the origin of the elastic isotropy in a Ti3SiC2 MAX phase. |
| Databáze: | OpenAIRE |
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