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Strength and toughness of nanocrystalline SiO.sub.2 stishovite toughened by fracture-induced amorphization.(Report)

Yoshida, Kimiko ; Nishiyama, Norimasa ; Sone, Masato ; Wakai, Fumihiro

Acta Materialia, Feb 1, 2017, Vol.124, p.316(9) [Tạp chí có phản biện]

ISSN: 1359-6454 ; DOI: 10.1016/j.actamat.2016.11.014

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  • Nhan đề:
    Strength and toughness of nanocrystalline SiO.sub.2 stishovite toughened by fracture-induced amorphization.(Report)
  • Tác giả: Yoshida, Kimiko ; Nishiyama, Norimasa ; Sone, Masato ; Wakai, Fumihiro
  • Chủ đề: Glucocorticoids ; Zirconium ; Zirconium Oxide
  • Là 1 phần của: Acta Materialia, Feb 1, 2017, Vol.124, p.316(9)
  • Mô tả: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.actamat.2016.11.014 Byline: Kimiko Yoshida (a), Norimasa Nishiyama (b), Masato Sone (a), Fumihiro Wakai (a) Abstract: The finding of "fracture-induced amorphization" in nanocrystalline SiO.sub.2 stishovite lead to a proposal of a new type of transformation toughening by the direct transition from crystal to amorphous state, which is different from the classical martensitic transformation of zirconia. Here, we investigated strength and toughness of nanocrystalline stishovite by using micro-cantilever beam specimens of different sizes. The maximum strength of 6.3 GPa gave the estimate of the lower bound of critical stress for amorphization, which was much higher than the critical transformation stress of zirconia. The crack growth resistance curve (R-curve) rose steeply with crack extension of only a few [mu]m, and reached to a plateau value of 10.9 MPa m.sup.1/2. We discussed the effects of grain size, microstrain, and dislocation density on the critical stress, the transformation zone width, and thereby, the fracture toughness. Author Affiliation: (a) Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, R3-23 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan (b) Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607, Hamburg, Germany Article History: Received 19 September 2016; Revised 6 November 2016; Accepted 7 November 2016
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 1359-6454 ; DOI: 10.1016/j.actamat.2016.11.014

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