On the Apparent Viscosity and Structure of Partially Solidified Al-Cu Alloys under Stirring

Mori Nobuyuki, \={O}gi Keisaku, Matsuda Kimio

doi:10.2320/jinstmet1952.48.9_936

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Other Title

半溶融状態で撹拌したAl-Cu合金の組織とみかけ粘度
半溶融状態で攪拌したAl-Cu合金の組織とみかけ粘度
ハンヨウユウジョウタイデカクハンシタ Al Cu ゴウキンノソシキ

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Apparent viscosity of partially solidified alloys is expected to be extremely influenced by the size and morphology of crystals. An Al-5%Cu alloy was stirred during solidification with a paddle or a columnar rotor, and factors affecting the apparent viscosity and structure of the alloy slurry were investigated. The apparent viscosity (μ/Pa·s) of the slurry was approximated by the following equation as a function of the rotation speed (n/s⁻¹) between rotor and crucible, the cooling rate (V_c/K·s⁻¹) and the fraction solid (f_s). (This article is not displayable. Please see full text pdf.) \oindentwhere A=1.8 (paddle) and 0.9 (columnar rotor). Primary crystals were broken into fine quasi-spherical particles by the stirring, while some of them coalesced into complicated particles in the slurry. A relationship was observed between the apparent viscosity and the particle coupling ratio R_n, that is, the ratio of the number (mm⁻²) of fine quasi-spherical primary particles to the number (mm⁻²) of complicated particles.

Journal

Journal of the Japan Institute of Metals and Materials

Journal of the Japan Institute of Metals and Materials 48 (9), 936-944, 1984

The Japan Institute of Metals and Materials

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