Possibility of Low-Temperature High-Strain-Rate Superplasticity in Fine-Grained Ceramic Materials

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  • HIRAGA Keijiro
    Research Center for Functional Materials, National Institute for Materials Science School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology
  • KIM Byung-Nam
    Research Center for Functional Materials, National Institute for Materials Science
  • MORITA Koji
    Research Center for Functional Materials, National Institute for Materials Science
  • YOSHIDA Hidehiro
    Research Center for Functional Materials, National Institute for Materials Science
  • SAKKA Yoshio
    Research Center for Functional Materials, National Institute for Materials Science
  • HURUSE Hiroaki
    School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology

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Other Title
  • 微結晶粒セラミック材料における低温高速超塑性の可能性
  • ビケッショウリュウ セラミック ザイリョウ ニ オケル テイオン コウソク チョウソセイ ノ カノウセイ

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<p>For attaining high-strain-rate superplasticity (HSRS) in ceramic materials, prerequisites are described on the basis of existing knowledge about high-temperature plastic deformation and intergranular cavitation mechanisms. The knowledge suggests that a combination of grain-size refinement to 100-200 nm or smaller and enhanced diffusion caused by doping may highly enhance stress-relaxation around triple junctions and may lead to HSRS at temperatures lower than 1250-1300°C in structural ceramics. From this point of view, recent studies are reviewed and discussed on ceramic superplasticity at strain rates higher than 1 × 10−2 s−1. Attention is also placed on the fabrication of materials with nanosized grains and the resultant superplastic properties.</p>

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