2007 Fiscal Year Final Research Report Summary
Mlaostructuecontno llnighmlicf ; mfionand crystal gowthunderanagieticteld
| Project/Area Number |
18360369
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | Osaka University |
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Principal Investigator |
YASUDA Hideyuki Osaka University, Graduate School of Engineering, Professor (60239762)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIYA Masato Osaka University, Graduate School of Enginearing, Assistant to Professor (00399601)
NAGIRA Tomoya Osaka University, Gradmte School of Engineering, Assistant Professor (00379124)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Magneto-science / solidification / crystal growth / crystal alignment / Orderging / High magnetic field / Magnetocrystalline anisotropy / Coarsening |
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| Research Abstract |
In this research project, we focused on microstructure evolution (regular structure, crystallographically aligned structure and so on) during solidification and coarsening.
(1) Formation of the regular structure by the magnetic effect on the solidifying frot
Suppression of the local melt flow (the micro-MHD effect) becomes apparent under a high magnetic field. For the Al-In monotectic alloys, the regular structure in which the rods are regularly aligned was formed. From viewpoints of the micro-MHD and the dipole-dipole interaction, the formation of the regular structure was discussed.
(2) Formation of the regular structure by the dipole -dipole interaction in fluid
The dipole-dipole interaction enhanced the regularity of the Ti02 spherical particles with a diameter from sub micro meter to several micrometer after the sedimentation. The results showed that the magnetic effect could be used for fabricating crystals which consisted of the fine particles (oxide particles).
(3) Formation of the aligned structure during solid state transformation
The phase filed model that includes the principles of the thermodynamics was introduced to analyze the formation of the crystallographically aligned structure during coarsening process. The calculation showed that the magnetocrystalline anisotropy energy could contribute to the formation of the aligned structure in some conditions. Inhomogeneity in grain size and distance between grains degraded the degree of the alignment.
In addition, the three dimensionally aligned structure was fabricated for the intermetallic compound with the lower crystal symmetry.
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[Journal Article] Time-resolved X-ray imaging of the dendritic and the monotectic solidifi cation of Sn, Al and Cu-based alloy2007
Author(s)
H. Yasuda, T. Nagira, M. Yoshiya, A. Sugiyama, I. Ohnaka, M. Yoshiya, K. Kawasaki, K. Umetani, K. Uesugi,
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Journal Title
Proc. 5th decennial international conference on Solidification Processing,
Pages: 307-310
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Control of Monotectic Solidi fication by a High Static Magnetic Field2007
Author(s)
H., Yasuda, I., Ohnaka, B., KDhinda, T., Nagira, K., CUmetani, K., Uesugi, A., Tsuchiyama, T., Nakano
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Journal Title
Trans. Indian Inst. Met 60
Pages: 75-78
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Effect of the melt flow on the solidified structure of middle carbon steel by means of the levitation method using alternating and static magnetic fields2007
Author(s)
H., Yasuda, T., Yoshimoto, T., Mizuguchi, Y., Tamura, T., Nagira, M., Yoshiya
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Journal Title
1511 International 47
Pages: 612-618
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Time-resolved X-ray imaging of the dendritic and the monotecticsolidification of Sn, AI and Cu-based alloy2007
Author(s)
H., Yasuda, T., Nagira, M., Yeshiya, A., Sugiyama, I., Ohnaka, M., Yoshiya, K., Kawasaki, K., Umetani, K., Uesugi
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Journal Title
Proc. 5th decennial international conference on Solidification Processing
Pages: 211-214
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Time-resolved X-ray Imaging of crystal growth (Japanese)2007
Author(s)
H., Yasuda, Y., Yamamoto, T., Nagira, M., Yoshiya, A., Sugiyama, I., Ohnaka, K., Uesugi, K., Umetani
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Journal Title
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「研究成果報告書概要(欧文)」より
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[Journal Article] Fabrication of Porous Aluminum and Copper Media by using Monotectic Solidification under a Magnetic Field2006
Author(s)
H., LYasuda, I., Ohnaka, B., KDhindaw, S., Fujimoto, N., Takezawa, T., Tamayama, A., Tsuchiyama, T., Nakano, K., CUesugi
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Journal Title
Mater. Sci. Forum 512
Pages: 289-294
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Fabrication of Aligned Pores in Aluminum by Electroc bemical Dissolution of Monotectic Alloys Solidified under a Magnetic Field2006
Author(s)
H., Yasuda, I., Ohnaka, S., Fujimoto, N., Takezawa, A., Tsuchiyama, T., Nakano, K., Uesugi
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Journal Title
Scr. Met 54
Pages: 527-532
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] TIME-RESOLVED IMAGING OF THE MICROSTRUCTURE EVOLUTION DURING DENDRITIC SOLIDIFICATION BY USING SYNCHROTRON RADIATION2006
Author(s)
H., Yasuda, I., Ohnaka, A., Sugiyama, T., Nagira, N., Tsukihara, K., Kawasaki, K., Umetani
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Journal Title
Modeling of Casting, Welding and Advanced Solidification Processes - XI
Pages: 375-382
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Measurement of Crystal Growth Velocity in Bulk -metallic-glass Forming Alloys2006
Author(s)
H., Yasuda, D., Nagamatsu, Y., Tamura, T., Yoshimoto, T., Nagira, Y., Yokoyama, A., lnoue
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Journal Title
Proc. 5th Int. Symp. on Electromagnetic processing of Materials
Pages: 449-453
Description
「研究成果報告書概要(欧文)」より
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