Picosecond amorphization of SiO2 stishovite under tension

Science Advances
Masaaki MisawaFumihiro Wakai

Abstract

It is extremely difficult to realize two conflicting properties-high hardness and toughness-in one material. Nano-polycrystalline stishovite, recently synthesized from Earth-abundant silica glass, proved to be a super-hard, ultra-tough material, which could provide sustainable supply of high-performance ceramics. Our quantum molecular dynamics simulations show that stishovite amorphizes rapidly on the order of picosecond under tension in front of a crack tip. We find a displacive amorphization mechanism that only involves short-distance collective motions of atoms, thereby facilitating the rapid transformation. The two-step amorphization pathway involves an intermediate state akin to experimentally suggested "high-density glass polymorphs" before eventually transforming to normal glass. The rapid amorphization can catch up with, screen, and self-heal a fast-moving crack. This new concept of fast amorphization toughening likely operates in other pressure-synthesized hard solids.

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Citations

Dec 14, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Huynh Anh HuyGiang Hoang Nguyen
Dec 9, 2017·The Journal of Physical Chemistry Letters·Lei YanSheng Meng

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