Abstract
According to orthogonal regression method, an experiment is designed to study the influences of the degassing agent, the degassing time and the degassing temperature on surface tension of eutectic Al-Si alloy. A model how surface tension of eutectic Al-Si alloy is affected by the degassing treatment has been obtained by experiments. The surface tension is mainly affected by the quantity of the degassing agent, the degassing time is less important, and the degassing temperature was found to have little influence on the surface tension. Moreover, the influences of the interactive and quadratic terms can be neglected. The further comparative experiments have shown there are very small deviations between the calculated values and the measured values. So the surface tension of eutectic Al-Si alloys can be calculated by the sum of different contributions from the quantity of the degassing agent, the degassing time and the degassing temperature.

Key words
surface tension, degassing, orthogonal regression design, Al-Si alloy

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