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Refinement and Localization of Primary Intermetallic Compound in Hyperperitectic Al–Cr Alloy by Centrifugal Duplex Casting

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Title: Refinement and Localization of Primary Intermetallic Compound in Hyperperitectic Al–Cr Alloy by Centrifugal Duplex Casting
Authors: Ohmi, Tatsuya Browse this author →KAKEN DB
Kimura, Yoshiaki Browse this author
Itoh, Youichi Browse this author
Kudoh, Masayuki Browse this author
Matsuura, Kiyotaka Browse this author →KAKEN DB
Keywords: composite material
intermetallic compound
hyperperitectic aluminum-chromium alloy
centrifugal casting
rapid solidification
structure control
Issue Date: Oct-1997
Publisher: The Japan Institute of Metals
Journal Title: Materials Transactions, JIM
Volume: 38
Issue: 10
Start Page: 879
End Page: 885
Publisher DOI: 10.2320/matertrans1989.38.879
Abstract: A novel process named Centrifugal Duplex Casting has been proposed: It is a manufacturing process of an aluminum cast pipe with an in-situ composite layer which contains fine intermetallic crystals. In this process, two kinds of molten metal, i.e. molten aluminum (the first melt) and molten Al–Cr alloy with higher liquidus temperature (the second melt), are cast in sequence at a given interval into the rotating mold of a centrifugal caster. The second melt collides with the meniscus of the first melt, and is dispersed as a great number of fine fluid clumps. These fluid clumps are rapidly quenched, migrate toward the outer periphery, and accumulate to form the composite layer. The particle size of the intermetallic crystals in this composite layer is much smaller than that of the Al–Cr alloy centrifugally cast by a conventional process. The solidification structure of the cast pipe produced by Centrifugal Duplex Casting is controlled by cooling capacity of the first melt. For instance, when the first melt has superheat at the moment of the second-melt casting, coarse intermetallic crystals grow inside of the refined composite layer. On the other hand, when the first melt has partially been solidified, the growth of the intermetallic crystals is suppressed. Therefore, the time interval between the two casting operations is an important parameter in this process.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大参 達也

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