Abstract
This study investigated the influence of silicon content and pouring temperature on the shape of eutectic silicon in the hypoeutectic Al-Si strips produced by an unequal-diameter twin-roller strip caster. The strips had three different silicon contents; 6.35wt%, 8.89wt% and 10.67wt%. They were poured at various temperatures from 600°C to 650°C. The results indicate equiaxed cells in the central zone of the strips. While both acicular and granular eutectic silicon can be observed in this equiaxed-cell zone, the area of the zone with granular particles increases with decreasing pouring temperature in the strips of higher silicon content. Al-10.67wt% Si strip, having the highest silicon content, can obtain completely granular particles when poured at the lowest temperature of 600°C. Acicular eutectic silicon particles which lead to crack initiation largely account for the elongation deterioration. Nonetheless, if the particles in the equiaxed-cell zone are partly or all granular, the elongation can be enhanced. Hence, increasing silicon content and lowering pouring temperature to modify the eutectic silicon in the equiaxed-cell zone from acicular to granular can improve the ductility.
Original language | English |
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Pages (from-to) | 167-177 |
Number of pages | 11 |
Journal | International Journal of Cast Metals Research |
Volume | 12 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1999 Jan 1 |
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys