Nanotwinned CrN ceramics with enhanced plasticity
Abstract Ceramic materials are usually hard but brittle, and it is challenging to achieve a simultaneous enhancement of strength and plasticity using conventional strengthening methods. In ceramic materials with similar atomic size and properties, the fabrication of nanotwins is a promising approach...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-61275-2 |
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| Summary: | Abstract Ceramic materials are usually hard but brittle, and it is challenging to achieve a simultaneous enhancement of strength and plasticity using conventional strengthening methods. In ceramic materials with similar atomic size and properties, the fabrication of nanotwins is a promising approach to enhance the plasticity, but it is unknown whether the strategy works for transition metal nitrides. Herein, nanotwinned CrN (NT-CrN) with a twin density of 9.0 × 1015 m-2 and twin-containing grain volume fraction of about 52 % is prepared by adjusting the ion kinetic energy during growth. Owing to the twin boundaries, NT-CrN exhibits high hardness (>36 GPa) and enhanced room-temperature plasticity at the same time. Compression deformation of over 40% without brittle failure is achieved. The enhanced room-temperature plasticity is attributed to the distributions of nanotwin boundaries (nano-TB) which allow special slipping by twisting the polyhedron constructed by nano-TB without bond breakage. The accompanying twin proliferation and fusion subsequently dissipate the energy to enhance the plasticity. |
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| ISSN: | 2041-1723 |