Abstract
The properties of intermetallic compounds are sensitive to alloying composition determined by the melting process. This article describes research that aims to control the composition of a TiAl melt during the ISM process. Firstly, the vapor pressures of Al and Ti in the TiAl melt were established and the results show that P Al/ P Ti is over 300. The ratio points out that Al will evaporate more predominantly than Ti in the TiAl melt during the vacuum melting process. Then, the mass transport coefficient K and the mass evaporation rate N m were calculated. The vacuum pressure has the same influence on K and N m. There are two contraflexure points of the vacuum pressure, namely the critical point and the impeding point. When the vacuum pressure surpasses the impeding point, the evaporation of Al can be neglected. When the vacuum pressure is below the critical point, the evaporation of Al will take on a free evaporation and the Al content will decreases to 40at% from 48at%. The calculated results were compared with the experimental data, which verified the calculation results.
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