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Title: 亜共晶Al-Si合金の半凝固スラリーとリンを添加した過共晶Al-Si合金溶湯との混合による微細初晶シリコンの生成
Other Titles: Formation of Fine Primary Silicon Crystals by Mixing of Semi-solid Slurry of Hypoeutectic Al-Si Alloy and Phosphorus-Added Hypereutectic Al-Si Alloy Melt
Authors: 大参, 達也1 Browse this author →KAKEN DB
簑口, 光樹2 Browse this author
工藤, 昌行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
Minoguchi, Kouki2
Kudoh, Masayuki3
Itoh, Youichi4
Matsuura, Kiyotaka5
Ishii, Kuniyoshi6
Keywords: semi-solid metal
hypereutectic aluminum-silicon alloy
hypoeutectic aluminum-silicon alloy
primary silicon
eutectic silicon
solidification structure
Issue Date: Mar-1994
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: 58
Issue: 3
Start Page: 324
End Page: 329
Publisher DOI: 10.2320/jinstmet1952.58.3_324
Abstract: The principle of a new process to produce the semi-solid slurry of hypereutectic Al-Si alloy containing fine primary silicon crystals has been proposed: the process was named “slurry-melt mixing (SMM)” process. In this process, a phosphorus-added hypereutectic Al-Si alloy melt (second-alloy melt) was mixed with a semi-solid slurry of a hypoeutectic Al-Si alloy (first-alloy slurry) under a furnace-cooling atmosphere. As the two kinds of alloys were brought into contact with each other with agitation, the second-alloy melt was rapidly quenched to precipitate numerous fine primary silicon crystals, while the equiaxed alpha solid solution in the first-alloy slurry was remelted absorbing the latent heat of fusion. And the enthalpy balance of the two alloys led the mixed alloy to a stable solid-liquid coexisting state. Al-20 mass%Si alloy slurry was produced by the SMM process with the combination of an Al-8 mass%Si alloy and a phosphorus-added Al-32 mass%Si alloy. The arithmetic mean of area-equivalent diameters of the primary silicon crystals in the SMM slurry was 27 μm. The fluidity of the SMM slurry could be kept for about 1000 s because of the low cooling rate of the atmosphere. Sodium-addition into the SMM slurry makes it possible to achieve the modification of the eutectic silicon crystals without the coarsening of the primary silicon crystals.
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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