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Superplastic Forming of Grain Boundary Controlled Ceramics

晶界控制陶瓷的超塑性成形

基本信息

批准号：
09555208
负责人：
SAKUMA Takeo
金额：
$ 8.64万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555208/
关键词：
Superplasticity grain b'ry sliding grain b'ry metal ceramics intermetallics

项目摘要

We are working on the superplasticity in ceramics with a special interest to break through the present limitations in superplasticity research. The past research on superplasticity was made mainly by analysing the flow stress against strain rate relationship to find a rate-controlling mechanism. This is one of the effective ways to understand the superplastic flow invarious materials including caramics. However, the limitation of this type of macroscopic analusis is in the tact that it is hard to make clear the atomistic mechanism of superplastic flow. We examined to analyze the grain b'ry structure and the chemical bonding state in grain b'ries of superplastic ceramics, and formed that our very microscopic approach is, no doubt, a new challenge to break through the study on superplasticity, in pavticular, ceramic materials, in which the flow behavior is very sensitive to grain b'ry chemisfy and atomic bonding state. Our new approach is aninnovation in superplasticity research.

我们致力于陶瓷超塑性的研究，特别是突破目前超塑性研究的局限性。以往对超塑性的研究主要是通过分析流变应力与应变速率的关系来寻找速率控制机制。这是理解包括碳化物在内的各种材料的超塑性流动的有效途径之一。然而，这种宏观分析的局限性在于，它很难弄清超塑性流动的原子机制。本文试图分析超塑性陶瓷的晶界结构和晶界中的化学键合状态，认为我们的微观研究方法无疑是突破对颗粒状陶瓷材料超塑性研究的一个新的挑战，因为颗粒状陶瓷材料的流动行为对晶界的化学键合状态和原子键合状态非常敏感。我们的新方法是超塑性研究中的一个创新。