Transformation Toughening by Fracture-Induced Amorphization in Nanopolycrystalline Stishovite

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  • スティショバイト・ナノ多結晶体における破壊誘起アモルファス化による変態強化
  • スティショバイト ・ ナノ タケッショウタイ ニ オケル ハカイ ユウキ アモルファスカ ニ ヨル ヘンタイ キョウカ

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Nanopolycrystalline stishovite was fabricated under high pressure and temperature using Kawai-type apparatus. This material is the hardest oxide as well as one of the toughest ceramics with fracture toughness of about 12 MPa m1/2. We performed X-ray absorption spectroscopy using synchrotron radiation, bending tests using micro-cantilever specimens fabricated by focused ion beam technique, and first-principles calculations for this material. Using the obtained results, we demonstrated that this material is toughened by transformation toughening mechanism by fracture-induced amorphization of stishovite. This toughening mechanism can be a platform to produce new structural materials.<br>

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