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Nanotwinned CrN ceramics with enhanced plasticity

by Zhang, Kan , Cui, Suihan , Yang, Dongjie , Liu, Liangliang , Chu, Paul K. , Chen, Shusheng , Gu, Xinlei , Xu, Qiang , Wu, Zhongzhen , Huang, Bingjing , Ma, Ziqi , An, Xiaokai , Li, Tijun

in 639/301/1023/1024 / 639/301/1023/303 / Boundaries / Brittleness / Ceramics / Chromium / Chromium nitride / Energy / Fabrication / Fourier transforms / Hardness / Humanities and Social Sciences / Kinetic energy / Metal nitrides / Metals / multidisciplinary / Plastic properties / Plasticity / Room temperature / Science / Science (multidisciplinary) / Transition metals / Transmission electron microscopy / Twin boundaries

2025

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Nanotwinned CrN ceramics with enhanced plasticity

by Zhang, Kan , Cui, Suihan , Yang, Dongjie , Liu, Liangliang , Chu, Paul K. , Chen, Shusheng , Gu, Xinlei , Xu, Qiang , Wu, Zhongzhen , Huang, Bingjing , Ma, Ziqi , An, Xiaokai , Li, Tijun

2025

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Nanotwinned CrN ceramics with enhanced plasticity

by Zhang, Kan , Cui, Suihan , Yang, Dongjie , Liu, Liangliang , Chu, Paul K. , Chen, Shusheng , Gu, Xinlei , Xu, Qiang , Wu, Zhongzhen , Huang, Bingjing , Ma, Ziqi , An, Xiaokai , Li, Tijun

2025

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Journal Article

Nanotwinned CrN ceramics with enhanced plasticity

Zhang, Kan,

Cui, Suihan,

Yang, Dongjie,

Liu, Liangliang,

Chu, Paul K.,

Chen, Shusheng,

Gu, Xinlei,

Xu, Qiang,

Wu, Zhongzhen,

Huang, Bingjing,

Ma, Ziqi,

An, Xiaokai,

Li, Tijun

2025

Overview

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 × 10 15 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. Nanotwinned ceramic chromium nitride (NT-CrN) is prepared by precisely controlling the deposition ion energy, which demonstrates high hardness (>36 GPa) with room-temperature compressive plasticity exceeding 40% without brittle fracture.

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Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio

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