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J. Jpn. Inst. Light Met. 42(3)_ 132- (1992).pdf1.93 MBPDFView/Open
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Title: NaおよびPの添加を併用した複合鋳込み法による過共晶Al-Si合金の改良処理
Other Titles: Modification of hipereutectic Al-Si alloys by the Duplex Casting process with addition of Na and P
Authors: 大参, 達也1 Browse this author →KAKEN DB
中寺, 一也2 Browse this author
工藤, 昌行3 Browse this author
Authors(alt): Ohmi, Tatsuya1
Nakadera, Kazuya2
Kudoh, Masayuki3
Keywords: hypereutectic Al-Si alloy
casting process
Issue Date: 30-Mar-1992
Publisher: 軽金属学会
Journal Title: 軽金属
Journal Title(alt): Journal of Japan Institute of Light Metals
Volume: 42
Issue: 3
Start Page: 132
End Page: 137
Publisher DOI: 10.2464/jilm.42.132
Abstract: Modification of Al-22mass%Si and Al-22mass%Si-2.5mass%Mg alloys was examined by combined use of the Duplex Casting process and addition of Na and P. In the Duplex Casting process, two kinds of alloy melts with different compositions were cast in the mold at a given interval. In this study, the combinations of Na-treated Al-12mass%Si alloy or Na-treated Al-12mass%Si-5mass%Mg alloy as the first melt and P-treated Al-32mass%Si alloy as the second melt were used. In the conventional casting, simultaneous addition of Na and P tends to coarsen the primary silicon crystal. On the other hand, refined primary silicon crystals and modified eutectic silicon crystals are observed in the ingots obtained by combined use of the Duplex Casting process and addition of Na and P. In the vicinity of the side surface of the ingots, markedly refined primary silicon crystals are observed, which show the synergistic effect of the Duplex Casting process and P addition to the second melt. Origin of "Primary Silicon Free Zone" in the ingots is the first melt incompletely mixed. Acceleration of circulation flow of the second melt in the mold alleviates the macrosegregation of primary silicon.
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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