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Al-3B master alloy is a kind of efficient grain refiner for hypoeutectic Al-Si alloys. Experiments were carried out to evaluate the effect of undissolved AlB 2 particles in Al-3B master alloy on the grain refinement of Al-7Si. It is found that the number and the settlement of AlB 2 particles in the melt all have effect on the grain refining efficiency. On the basis of experiments and...
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