The hardest polycrystalline diamond-interwoven nano twin diamond

The hardest polycrystalline diamond-interwoven nano twin diamond

Keywords polycrystalline diamond, twinning|2020-09-14 09:23:37|Source China Superhard Materials Network

Abstract As we all know, diamond is the hardest crystalline material in nature. In order to further improve the hardness of diamond, in the past few decades, scientists have done a large number of experimental and theoretical studies. The results show that according to the Hall-Petch formula, through the refinement of diamond...

As we all know, diamond is the hardest crystalline material in nature. In order to further improve the hardness of diamond, in the past few decades, scientists have done a lot of experiments and theoretical studies, and the results show that according to the Hall-Petch formula, by refining the grain size and twin thickness of diamond, Improve the hardness of diamond.

       For example, the Knoop hardness of nano-diamond with a grain size of 10-30 nm is as high as 110-140 GPa, which is significantly higher than that of single crystal diamond. By compressing the precursor of the onion structure, the Vickers hardness of nano twin diamond (nt-diamond) with an average twin thickness of 5-8 nm can reach 175-200 GPa, which is twice the hardness of single crystal diamond. New world record.

       Can the hardness of nano twin diamond be further improved? This is an important scientific problem in the design and preparation of new superhard materials.

       Professor Wen Bin from Yanshan University's Tian Yongjun academician team found that nano twins can be continuously added to nanodiamonds under the selection of appropriate materials and strict control of synthesis conditions. By analyzing the influence of the interwoven nano twin boundary on the critical slitting stress of dislocation slip, using the Sachs model, the hardness of the interwoven nano twin diamond is calculated. The research results show that intertwined nano twin boundaries can increase the hardness of diamond more than ordinary nano twins.

       This research work will provide a new way for the design and synthesis of new superhard materials.

       The article "Intersectional nanotwinned diamond-the hardest polycrystalline diamond by design"

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