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J. Jpn. Inst. Light Met. 44(2)_ 91- (1994).pdf1.16 MBPDFView/Open
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Title: 過共晶Al-Si合金の複合鋳込みにおける二次溶湯流体塊の過冷凝固挙動
Other Titles: Undercooling and solidification behavior of fluid clumps of second-poured melt of hypereutectic Al-Si alloy in Duplex Casting process
Authors: 大参, 達也1 Browse this author →KAKEN DB
工藤, 昌行2 Browse this author
大笹, 憲一3 Browse this author
伊藤, 洋一4 Browse this author
松浦, 清隆5 Browse this author →KAKEN DB
石井, 邦宜6 Browse this author
Authors(alt): Ohmi, Tatsuya1
Kudoh, Masayuki2
Ohsasa, Kenichi3
Itoh, Youichi4
Matsuura, Kiyotaka5
Ishii, Kuniyoshi6
Keywords: hypereutectic Al-Si alloy
Solidification structure
primary silicon
Issue Date: 28-Feb-1994
Publisher: 軽金属学会
Journal Title: 軽金属
Journal Title(alt): Journal of Japan Institute of Light Metals
Volume: 44
Issue: 2
Start Page: 91
End Page: 96
Publisher DOI: 10.2464/jilm.44.91
Abstract: The primary silicon crystals of hypereutectic Al-Si alloys are reported to be refined by the Duplex Casting process (a two-step casting of two molten alloys with different composition; i. e., "the first alloy" with lower liquidus temperature and "the second alloy" with higher liquidus temperature). Recently, concerning the refining mechanism, the authors have proposed that copious nucleation of primary silicon crystals takes place in the second alloy which is rapidly cooled and highly undercooled during mixing with the first alloy. The purpose of this study is to investigate the degree of under-cooling and the solidification behavior of the fluid clumps of the second alloy which are thought to form the clustering structures of fine primary crystals. The relationships between the degree of undercooling and the primary silicon size of Al-32 mass%Si and Al-22 mass%Si alloys were obtained by use of three solidification techniques: (1) air-cooling or immersion into a metal bath of melt-filled graphite crucible, (2) casting in a wedge-shaped copper mold, and (3) melt-in-jection into a lead bath. The primary silicon size of the finest cluster observed in the ingot produced by the Duplex Casting process with the combination of Al-12 mass%Si alloy and Al-32 mass%Si alloy is 15μm, and the corresponding undercooling is estimated at 243K.
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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