Abstract
Quantitative measurements of the strength development in the mushy-zone during solidification have been obtained in two commercial AlSi alloys, AlSi7Mg and AlSi11Mg, an AlCu4 alloy and an AlMg5 alloy with a vane method. The results show that the material does not have any strength prior to dendrite coherency, confirming that the dendrites are free-floating and independent. Grain refining the AlSi7Mg and AlCu4 alloy postpones strength development, and strength increases slowly in the grain refined AlCu4 alloy. Adding Sr to the AlSi7Mg alloy postpones dendrite coherency and strength develops more slowly. Fading is observed to change the strength back towards that of the unmodified alloy with time. Adding 1% Si to the AlMg5 alloy postpones dendrite coherency, but the strength increases rapidly and makes the strength of the AlMg5Si1 alloy converge towards that of the AlMg5 alloy at increasing solid fractions. Strength develops very slowly in the AlSi11Mg alloy. The results are shown to be related to the size and morphology of the growing dendrites.
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