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Paper Titles
Preface & Committees
Forty-Five Years of Superplastic Research: Recent Developments and Future Prospects
p.3
Superplasticity of Metallic Alloys: Some Current Findings and Open Questions
p.13
Advances in Superplasticity of Ultrafine-Grained Alloys: Recent Research and Development
p.23
Improvement of Superplasticity in Fine-Grained Oxide Ceramics Based on the Concept of Grain Boundary Plasticity
p.34
Direct Observation of Two-Dimensional Grain Boundary Sliding and Switching in ODS Ferritic Steel
p.43
Description of the Superplastic Flow Process by Deformation Mechanism Maps in Ultrafine-Grained Materials
p.51
Texture Change during Superplastic Deformation in Fine-Grained Magnesium Alloys
p.59
Superplastic Deformation Mechanisms in High Magnesium Contenting Aluminum Alloy
p.66

Improvement of Superplasticity in Fine-Grained Oxide Ceramics Based on the Concept of Grain Boundary Plasticity

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Abstract:

Superplasticity in fine-grained oxide ceramics has been generally elucidated on the basis of their experimental strain rate-flow stress relationship and phenomenological analysis of cavity nucleation and growth. It has been widely accepted that the high temperature superplastic flow and failure in ceramics is significantly influenced by the atomic structure and chemistry of grain boundaries. Such phenomenon cannot be explained based on the classical phenomenological analysis. Our research group has therefore proposed to establish a new research field, grain boundary plasticity, to describe the superplastic deformation related to the grain boundary atomic structure. This paper aims to point out the importance of the atomistic analysis of grain boundary to develop new superplastic ceramics.

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Periodical:

Materials Science Forum (Volumes 838-839)

Pages:

34-40

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.838-839.34

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Online since:

January 2016

Authors:

Hidehiro Yoshida, Koji Morita, Byung Nam Kim, Koji Matsui, Yuichi Ikuhara, Taketo Sakuma

Keywords:

Ceramic, Chemical Bonding State, Diffusion, Grain Boundary, Superplasticity

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