Contribution of boundary non-stoichiometry to the lower-temperature plasticity in high-pressure sintered boron carbide

Haiyue Xu, Wei Ji (), Jiawei Jiang, Junliang Liu, Hao Wang, Fan Zhang, Ruohan Yu, Bingtian Tu, Jinyong Zhang, Ji Zou, Weimin Wang, Jinsong Wu and Zhengyi Fu ()
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Haiyue Xu: Wuhan University of Technology
Wei Ji: Wuhan University of Technology
Jiawei Jiang: University of Oxford
Junliang Liu: University of Oxford
Hao Wang: Wuhan University of Technology
Fan Zhang: Wuhan University of Technology
Ruohan Yu: Wuhan University of Technology
Bingtian Tu: Wuhan University of Technology
Jinyong Zhang: Wuhan University of Technology
Ji Zou: Wuhan University of Technology
Weimin Wang: Wuhan University of Technology
Jinsong Wu: Wuhan University of Technology
Zhengyi Fu: Wuhan University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The improvement of non-oxide ceramic plasticity while maintaining the high-temperature strength is a great challenge through the classical strategy, which generally includes decreasing grain size to several nanometers or adding ductile binder phase. Here, we report that the plasticity of fully dense boron carbide (B4C) is greatly enhanced due to the boundary non-stoichiometry induced by high-pressure sintering technology. The effect decreases the plastic deformation temperature of B4C by 200 °C compared to that of conventionally-sintered specimens. Promoted grain boundary diffusion is found to enhance grain boundary sliding, which dominate the lower-temperature plasticity. In addition, the as-produced specimen maintains extraordinary strength before the occurrence of plasticity. The study provides an efficient strategy by boundary chemical change to facilitate the plasticity of ceramic materials.

Date: 2023
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DOI: 10.1038/s41467-023-40581-7

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