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FP5

VIRCAST Report Summary

Project ID: G5RD-CT-2000-00153
Funded under: FP5-GROWTH
Country: Norway

A new technique for studying bridging and coalescence during solidification

SINTEF and NTNU have developed a new technique for studying the formation of interdendritic bridging (coalescence) during solidification. The existence of such interdendritic bridges at various solid fractions is demonstrated experimentally in binary aluminium alloys. Small samples have been solidified and subsequently quenched in water close to the start of the eutectic reaction. Al-Cu samples with various amounts of eutectic have been investigated to assess the solid fraction corresponding to the onset of bridging. A thin polished section of an Al-12wt. %Mg sample has been deep etched to remove the quenched eutectic and investigated in a SEM. Interdendritic bridges have been shown to exist in fragments of the sample.

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Lars ARNBERG
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