THE EFFECTS OF MASS TRANSFER IN THE LIQUID PHASE ON THE RATE OF ALUMINIUM EVAPORATION FROM THE Ti-6Al-7Nb ALLOY

L. Blacha, Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, Katowice J. Mizera, Warsaw University of Technology, Faculty of Materials Engineering, Warszawa P. Folęga, Silesian University of Technology, Faculty of Transport, Katowice, Poland In the present paper, the rate of aluminium evaporation from the Ti-6Al-7Nb alloy during smelting with the use of VIM method at 5 to 1 000 Pa and 1 973 to 2 023 K has been discussed. It has been observed that pressure reduction and temperature rise aff ect aluminium elimination from the alloy. Based on the determined values of overall mass transfer coeffi cients and mass transfer coeffi cients in the liquid phase, it has been found that the resistance related to aluminium mass transfer in the liquid phase is about 8 % of the overall process resistance.