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Title: 複合鋳込み遠心鋳造法により作製した過共晶Al-Ni合金傾斜機能材の凝固組織
Other Titles: Solidification Structure of Functionally Graded Hypereutectic Al-Ni Alloys Produced by Centrifugal Duplex Casting
Authors: 大参, 達也1 Browse this author →KAKEN DB
上田, 誠2 Browse this author
伊藤, 洋一3 Browse this author
松浦, 清隆4 Browse this author →KAKEN DB
工藤, 昌行5 Browse this author
Authors(alt): Ohmi, Tatsuya1
Ueda, Makoto2
Itoh, Youichi3
Matsuura, Kiyotaka4
Kudoh, Masayuki5
Keywords: centrifugal casting
composite material
intermetallic compound
aluminum alloy
rapid solidification
structure control
Issue Date: Jul-2000
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 64
Issue: 7
Start Page: 483
End Page: 489
Publisher DOI: 10.2320/jinstmet1952.64.7_483
Abstract: Solidification structures of Al-Ni and Al-Ni-Si alloys produced by Centrifugal Duplex Casting (CDC process) have been investigated. The CDC process is applicable to the production of a cast pipe of an aluminum alloy with an in situ composite layer containing fine intermetallic crystals. In this process, two molten metals, i.e. “the first melt” (aluminum or a hypoeutictic aluminum alloy) and “the second melt” (a hypereutectic or hyperperitectic aluminum-transition metal alloy with a higher liquidus temperature), are poured in sequence at a given interval into a roating mold of a centrifugal caster. Because the first melt acts as a coolant, the second melt is rapidly quenched to precipitate extremely fine primary crystals when they are mixed in the mold. When the first melt of an Al-5 mass%Ni alloy and the second melt of an Al-30 mass%Ni alloy were used, the composite layer in the CDC pipe consisted of the `“refined composite layer” with fine intermetallic particles and the “coarse composite layer” with relatively coarse particles. The coarse composite layer is subdivided into two sub-layers, i.e. the layer with accumulated flaky particles and that with freely grown particles. The refined composite layer was not formed when the first melt was aluminum whose melting point is higher than the liquidus temperature of the Al-5 mass%Ni alloy. On the other hand, large clusters with fine Al3Ni crystals were formed when the first melt was an Al-12 mass%Si alloy whose liquidus temperature is lower than the Al-Al3Ni eutectic temperature. However, these clusters did not form the refined composite layer but coexisted with flaky particles of Al3Ni.
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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