2008•Journal of Jiangsu University of Science and TechnologyRequires access

Al-P-RE-Sr Combination Modifier Hypereutectic Al-Si Alloy

FU Xuehui

Abstract

The effect of Al-P-RE-Sr combination modification on the structure of Al-30%Si alloy is studied.After modification,the primary Si phase will be in dispersion state for a long time without congregation.The average grain size of primary Si phase is not be greater than 20μm.At the same time,the eutectic Si is also in the shape of fibre or spot.The combination modification time can reach 7 hours.The effect of the black lead mold is not different from the metal mold.The mechanics capability of the material is improved with the strength σb reaching to 234.3 MPa and the ductibility δ reaching to 3.0%.

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Key concepts: Eutectic system, Materials science, Alloy, Mold, Metallurgy, Phase (matter), Dispersion (optics), Aluminium