Dynamics of Grain Boundary Network in Ceramics Superplasticity

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  • WAKAI Fumihiro
    Materials and Structures Laboratory, Tokyo Institute of Technology

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  • セラミックス超塑性の粒界ネットワーク • ダイナミクス

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A ceramic material can be elongated extensively in tension above approximately half the absolute melting point provided it has a fine (<1 μm diameter) equiaxed grain size that is stable during deformation. The discovery of superplasticity in ZrO2-based ceramics triggered numerous research activities on ceramics superplasticity, because of potential applications to superplastic forming. Micrograins move past one another by grain boundary sliding during deformation. The analysis of grain boundary dynamics provides insight on the role of grain boundary in superplasticity and grain growth. Here, we review the current knowledge on ceramics superplasticity with a focus on how the grain boundary affects deformation behavior.<br>

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