1996 Fiscal Year Final Research Report Summary
Development of Composite-and-Functional Gradient Material by using Supercooling
| Project/Area Number |
06555059
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Thermal engineering
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| Research Institution | Kanazawa University |
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Principal Investigator |
HAYASHI Yujiro Kanazawa University, Department of Human and Mechanical Engineering, Professor, 工学部, 教授 (30019765)
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Toshio YKK Co., Ltd., 研究開発本部, 副主幹
YOSHIOKA Hideaki Toyama National Collage of Marine Technology, Department of Maritime Technology, 商船学科, 助手 (80259845)
TADA Yukio Kanazawa University, Graduate school of Natural Science and Technology, Assistan, 自然科学研究科, 助手 (20179708)
TAKIMOTO Akira Kanazawa University, Department of Human and Mechanical Engineering, Professor, 工学部, 教授 (20019780)
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| Project Period (FY) |
1994 – 1996
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| Keywords | Micro-Solidification / Supercooling / Crystal growth / Morphology / Composition |
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| Research Abstract |
Solidification is due to the restriction of rotational motion of liquid molecules and results in the fixation of solid structure as a regular and/or dense assembly of atoms with release of latent heat of fusion. From the viewpoint of the way that the latent-heat extraction should be, the solidification can be largely classified into three types in relating with cooling rates.
In low cooling rate, the latent heat is removed out by heat transfer and solidification proceeds quasisteadily with a solid-liquid interface kept at an equilibrium temperature. In high cooling rate, as for "rapid solidification of material processing", a supercooling state easily appears and this brings massive solidification due to crystal growth initiated by nucleation. The supercooling which makes a rapid and insitu solidification possible, may result in the formation of new meta-stable phases of crystalline and of amorphous. In intermediate cooling rate, the supercooling also appears and distributes in close region from the cooling surface to some internal position being equilibrium. These imply that the solidification proceeds under two kinds of heat extraction sources ; the initially distributed supercooling and the external cooling.
The emphasis in the discussion is on fundamentals of solidification of mixtures with supercooling under external heat transfer cooling : solidification process, appearance of micro-structure and microsegregation in the solid, and macro-micro conjugation of heat transfer with the solidification.
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