705 半溶融過共晶Al-Si合金の落下鍛造型粘度計による変形挙動解析

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  • 705 Analysis of Deformation Behavior of Semi-Solid Hypereutectic Al-Si Alloy Compressed in the Drop-Forge Viscometer

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The aim of this study is to investigate the rheological behavior for a semi-solid forming of Al-25 mass % Si alloy, i.e., hypereutectic Al-Si alloy, using a self-made parallel-plate drop-forge viscometer. Drop-forge experiments show individually the features that the viscosity decreased in the early increasing shear rate stage and subsequently the viscosity turned to increase as the shear rate decreased. Thus, the viscosity takes a minimum around the maximum shear rate. The summarized behavior between the viscosity, μ, and the shear rate,γ^^., can be described by a power-law model of μ=1.78×10^7γ^^.^<-1.5> Pa・s. The decrease in viscosity accompanied with the increase in the shear rate depends on both rises in the temperature and the applied force, not the duration of shear.

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