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Title: 過共晶Al-Si系合金の複合鋳込み鋳塊における微細初晶粒子の生成起源
Other Titles: Origin of Fine Primary Crystals in Hypereutectic Al-Si Alloy Ingots Produced by Duplex Casting Process
Authors: 大参, 達也1 Browse this author →KAKEN DB
田中, 康博2 Browse this author
工藤, 昌行3 Browse this author
Authors(alt): Ohmi, Tatsuya1
Tanaka, Yasuhiro2
Kudoh, Masayuki3
Keywords: casting process
hypereutectic aluminum-silicon alloy
primary silicon
aluminum-copper-silicon alloy
aluminum-germanium-silicon alloy
Issue Date: Jan-1992
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: 56
Issue: 1
Start Page: 96
End Page: 103
Publisher DOI: 10.2320/jinstmet1952.56.1_96
Abstract: In the previous paper, the authors reported the refinement of primary silicon crystals in the hypereutectic Al-22 mass%Si alloy ingots produced by the Duplex Casting process with the combination of Al-12 mass%Si alloy as the first melt and Al-32 mass%Si alloy as the second melt. In this study, three possible origins of the refined primary silicon crystals were examined: (1) detachment of eutectic silicon crystals during the remelting process of solidified shell of the first melt, (2) nucleation in the second melt during the mixing process of the first and second melts, and (3) nucleation after complete mixing. In order to examine the first origin, two combinations of alloy compositions were selected for the Duplex Casting process: Al-33 mass%Cu and Al-32 mass%Si; and (b) Al and Al-44 mass%Si. As a result, the primary silicon crystals were refined even though the first melt was free from silicon in either case. Therefore, the first origin was concluded to be not dominant in the refinement of primary crystals. The combination of Al-51 mass%Ge alloy and Al-32 mass%Si alloy was selected to examine the second and third origins. The germanium concentration in the refined primary crystals, which was measured by EPMA, was lower than the possible minimum concentration predicted on the assumption that the primary crystals came from the third origin. Therefore the second origin, i.e. nucleation in the second melt, was confirmed as the predominant one.
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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