| 1.Research Institution | University of Tokyo | |
| 2.Research Area | Physical and Engineering Science | |
| 3.Research Field | Next-generation Process Technologies | |
| 4.Term of Project | FY1996〜FY2000 | |
| 5.Project Number | 96P00402 | |
| 6.Title of Project | Control of Abnormal Structure Formation in Materials Processing |
| Name | Institution,Department | Title of Position |
| KOMIYAMA, Hiroshi | Univ. of Tokyo, School of Engineering | Professor |
8.Core Members
| Names | Institution,Department | Title of Position |
| OKUYAMA, Kikuo | Hiroshima Univ., Faculty of Engineering | Professor |
| MATSUKATA, Masahiko | Waseda Univ., School of Science & Engineering | Associate Professor |
| EGASHIRA, Yasuyuki | Osaka Univ., School of Engineering Science | Associate Professor |
9.Cooperating Researchers
| Names | Institution,Department | Title of Position |
| SHIMADA, Manabu | Hiroshima Univ., Faculty of Engineering | Associate Professor |
| HUNAKUBO, Hiroshi | Tokyo Institute of Technology, School of Science & Engineering | Associate Professor |
| NODA, Suguru | Univ. of Tokyo, School of Engineering | Associate Researcher |
10.Summary of Research Results
|
Undesired structures often appears in materials processing, which we name as "abnormal growth." It is usually considered only as error and the enormous experimental facts are scattered and remain unutilized. Controlling the abnormal growth itself is very important. In addition, understanding its mechanisms will allow us the fundamental understanding of the morphology evolution, which is zoomed up in the abnormality. The purposes of this project are not only to make clear the growth mechanisms and the countermeasures of the abnormal growth, but also to establish the knowledge infrastructure of the morphology evolution in the materials processing. First, we started with collecting the case studies, the number of which exceeded 700 at the end of the project. We extracted the typical cases through their classification and analysis, and carried out the several experimental and/or theoretical studies focused on them. We extracted the elements of the mechanisms, which we call process, and reconstructed the process models with them. Now that we can commonly treat the models, and put them in order into a directory structure. An computer simulator is also developed which can reproduce some of the structures, and linked to the process models. However, it is nearly impossible to complete this approach for all of the cases. In contrast, we can know the morphology for all of the cases by the electron micrographs. We thought out a "morphology space" composed of the axes on morphological characteristics, and succeeded to explain almost all of the morphologies. Since there can be found strong correlations between the processes and the morphologies, we can link them and the case studies together. From the aspect of the "process- structure- function" relationship in materials processing, the above-mentioned is of the "process- structure (morphology)" relationship accompanied with the experimental facts. We implemented the knowledge into a system on the web "http://www.a-growth.t.u-tokyo.ac.jp "and published it, which will support not only solving the abnormal growth but also learning the materials processing. |
11.Key Words
(1)materials processing、(2)abnormal growth、(3)knowledge infrastructure
(4)expert system、(5)experimental facts、(6)growth mechanisms
(7)countermeasures、(8)simulation、(9)morphology
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