Super Strengthening Nano-Polycrystalline Diamond through Grain Boundary Thinning

Mingguang Yao*, Fangren Shen, Dezhou Guo, Hua Zhang, Chunguang Zhai, Yuchen Shang, Jiajun Dong, Yuanlong Zhao, Zhaodong Liu, Zhipeng Li, Haixin Li, Hongdong Li, Qi An*, Bingbing Liu*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

9 引用 (Scopus)

摘要

Introducing nanostructures into diamonds is quite appealing for the synthesis of superhard materials with superior properties. However, as the grain size decreases to nanoscale, grain boundary effects become crucial yet complicated in the nanopolycrystalline diamond (NPD), making it challenging to tailor nanostructures. Here, atomistic simulations are combined with experiment to demonstrate a strengthening strategy for the sintered NPD by introducing thin amorphous grain boundary (AGB). The additive of small percentage of fullerene into precursors during sintering can significantly reduce crushed amorphous-like nanodomains in diamond nanocrystals, leading to the formation of thin AGB. Such sintered NPD exhibits a significant hardness and fracture toughness enhancement, exceeding that of single crystal diamonds. These atomistic simulations show that upon straining the plastic deformation, crack initiation and propagation in NPD is AGB thickness dependent, and thin AGB can reduce crack nucleation and block crack propagation, well explaining the experimental observations. This study indicates that grain boundary modulation provides a promising approach for rational designs of high-performance superhard materials with desired high strength.

源语言英语
文章编号2214696
期刊Advanced Functional Materials
33
18
DOI
出版状态已出版 - 2 5月 2023
已对外发布

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