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Title: 二段攪拌混合急冷法により組織制御したAl-Cr-Cu合金スラリーの遠心鋳造
Other Titles: Centrifugal Casting of Al-Cr-Cu Alloy Slurry, Structure-Controlled by Two-Step-Stir-Mix-Quenching Process
Authors: 大参, 達也1 Browse this author →KAKEN DB
神門, 宏2 Browse this author
工藤, 昌行3 Browse this author
Authors(alt): Ohmi, Tatsuya1
Jinmon, Hiroshi2
Kudoh, Masayuki3
Keywords: semi-solid processing
semi-solid slurry
centrifugal casting
composite material
rapid solidification
aluminum alloy
intermetallic compound
structure control
Issue Date: 1-Dec-2002
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: 66
Issue: 12
Start Page: 1311
End Page: 1316
Publisher DOI: 10.2320/jinstmet1952.66.12_1311
Abstract: We developed a two-step stir, mix, and quenching (SMQ) process to produce an Al-Cr-Cu alloy slurry with a high volume fraction of fine primary intermetallic crystals. In this process, we used a hypoeutectic Al-Cu alloy melt for the first melt and a hyperperitectic Al-Cr alloy melt with a higher liquidus temperature for the second and third melts. In the first step of the process, we stir-cast the first melt in a vessel to produce a semi-solid slurry containing aluminum solid solution (α-phase), and then mixed the second melt into the slurry. The hypoeutectic Al-Cu alloy slurry acted as a coolant, whose apparent heat capacity is enhanced by the latent heat of fusion of α-phase. The second melt was thus rapidly quenched, precipitating numerous primary intermetallic crystals when it contacted the slurry. In the second step of the process, we cooled the mixed alloy slurry while agitating it until it crystallized a certain quantity of α-phase, and then quenched the third melt into the slurry. An Al-6.7 mass%Cr-1.8 mass%Cu alloy slurry produced by this process was centrifugally cast to produce a tubular casting with thin, flange-like part. In the major portion of the tubular casting, fine primary intermetallic crystals were uniformly distributed. The average size of the primary crystals was 15±2 (μm), and their volume fraction was 0.22±0.05.
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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