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Picosecond amorphization of SiO2 stishovite under tension.

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.

SUBMITTER: Misawa M 

PROVIDER: S-EPMC5429036 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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Picosecond amorphization of SiO<sub>2</sub> stishovite under tension.

Misawa Masaaki M   Ryuo Emina E   Yoshida Kimiko K   Kalia Rajiv K RK   Nakano Aiichiro A   Nishiyama Norimasa N   Shimojo Fuyuki F   Vashishta Priya P   Wakai Fumihiro F  

Science advances 20170512 5

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 m  ...[more]

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