Evaporation of Al and Sn during ISM process of Ti-5Al-2.5Sn alloy

With the established model, the evaporation controlling mode as well as the evaporation rate of Al and Sn during ISM process of Ti-5Al-2.5Sn alloy was studied. The results show that the evaporation of Al and Sn is controlled by the evaporating reaction under the practical melting condition. The effect of the vacuum pressure on the evaporation rate appears to have a critical value. When the vacuum pressure is lower than the critical value, the evaporation rate does not change with the vacuum pressure, but when the vacuum pressure is higher than it, the evaporation rate decreases sharply to a minimum.